201
|
Vatansever E, Arslan D, Sarul DS, Kahraman Y, Nofar M. Effects of molecular weight and crystallizability of polylactide on the cellulose nanocrystal dispersion quality in their nanocomposites. Int J Biol Macromol 2020; 154:276-290. [PMID: 32184137 DOI: 10.1016/j.ijbiomac.2020.03.115] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 03/06/2020] [Accepted: 03/13/2020] [Indexed: 12/12/2022]
Abstract
This study investigated how cellulose nanocrystals (CNC) dispersion quality and its percolation network formation could be influenced when using polylactide (PLA) with various molecular weights and crystallizability. In this context, systematic rheological experiments were conducted on PLA/CNC nanocomposites prepared through solution casting method using dimethylformamide (DMF) as the solvent. It was found that lower CNC percolation concentrations could be obtained when a PLA matrix possesses lower molecular weight as the shorter chains and CNCs interpenetration could be facilitated during their dissolution in the solvent. On the other hand, the CNC percolation concentration was further lowered when the PLA with higher crystallizability was used. During the solvent evaporation step that occurred at 85 °C, the isothermal heterogeneous crystallization of PLA around the dispersed CNCs could prevent the driving force of the CNCs towards their re-agglomeration. Therefore, the finest CNC dispersion was appeared in the highly crystallizable low molecular weight PLA through which the rheological properties were dramatically improved and the thermal stability was significantly extended to higher temperatures. The crystallization behavior of the prepared nanocomposites was also analyzed using differential scanning calorimeter and X-ray diffractometer. The thermal degradation behavior of the PLA/CNC nanocomposites were examined through thermogravimetric and rheological analysis.
Collapse
Affiliation(s)
- Emre Vatansever
- Polymer Science and Technology Program, Institute of Science and Technology, Istanbul Technical University, Maslak, Istanbul 34469, Turkey
| | - Dogan Arslan
- Metallurgical and Materials Engineering Department, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, Maslak, Istanbul 34469, Turkey
| | - Deniz Sema Sarul
- Polymer Science and Technology Program, Institute of Science and Technology, Istanbul Technical University, Maslak, Istanbul 34469, Turkey
| | - Yusuf Kahraman
- Metallurgical and Materials Engineering Department, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, Maslak, Istanbul 34469, Turkey
| | - Mohammadreza Nofar
- Polymer Science and Technology Program, Institute of Science and Technology, Istanbul Technical University, Maslak, Istanbul 34469, Turkey; Metallurgical and Materials Engineering Department, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, Maslak, Istanbul 34469, Turkey.
| |
Collapse
|
202
|
Niu M, Wang H, Li J, Chen H, Li L, Yang H, Liu X, Chen Z, Liu H, Chen J. Polyethylene glycol grafted with carboxylated graphene oxide as a novel interface modifier for polylactic acid/graphene nanocomposites. ROYAL SOCIETY OPEN SCIENCE 2020; 7:192154. [PMID: 32874611 PMCID: PMC7428252 DOI: 10.1098/rsos.192154] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Accepted: 05/29/2020] [Indexed: 06/11/2023]
Abstract
Strength and toughness are both of great importance for the application of polylactic acid (PLA). Unfortunately, these two properties are often contradictory. In this work, an effective and practical strategy is proposed by using carboxylated graphene oxide (GC) grafted with polyethylene glycol (PEG), i.e. GC-g-PEG. The synthesis procedure of GC-g-PEG is firstly optimized. Then, a series of PLA nanocomposites were prepared by the melt blending method via masterbatch. In comparison to that achieved over pure PLA, these nanocomposites are of higher crystallinity, thermal stability and mechanical strength. This is mainly attributed to well-tailored interface and good dispersion. Especially, while retaining the tensile strength of the original PLA, the elongation at break increases by seven times by adding 0.3 wt% GC-g-PEG.
Collapse
Affiliation(s)
- Mingjun Niu
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, People's Republic of China
| | - Hao Wang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, People's Republic of China
| | - Jing Li
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, People's Republic of China
| | - Hongyan Chen
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, People's Republic of China
| | - Lin Li
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, People's Republic of China
| | - Huige Yang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, People's Republic of China
| | - Xuying Liu
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, People's Republic of China
| | - Zhihao Chen
- Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou 450001, Henan, People's Republic of China
| | - Hongzhi Liu
- School of Chemical and Biological Engineering, NingboTech University, No. 1 Xuefu Road, Ningbo 315100, People's Republic of China
| | - Jinzhou Chen
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, People's Republic of China
| |
Collapse
|
203
|
Guo Y, Peng S, Wang Q, Song X, Li C, Xia L, Wu H, Guo S. Achieving High-Ductile Polylactide Sheets with Inherent Strength via a Compact and Uniform Stress Conduction Network. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c01328] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yuhang Guo
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Shuangjuan Peng
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Qingwen Wang
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Xudong Song
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Chunhai Li
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Lichao Xia
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Hong Wu
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Shaoyun Guo
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| |
Collapse
|
204
|
Effect of magnetic field alignment of cellulose nanocrystals in starch nanocomposites: Physicochemical and mechanical properties. Carbohydr Polym 2020; 247:116688. [PMID: 32829816 DOI: 10.1016/j.carbpol.2020.116688] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 06/04/2020] [Accepted: 06/14/2020] [Indexed: 12/31/2022]
Abstract
The magnetic field (MF) induced alignment of cellulose nanocrystals (CNC) within a starch matrix is investigated and its effect on the physicochemical and mechanical properties of the nanocomposites are discussed in the paper. Two different kinds of CNC i.e. plant-CNC and tunicate-CNC and its hybrid combination are studied to understand the effect of aspect ratio of CNC on the properties of nanocomposite. Nanocomposites with tunicate sourced CNC showed higher tensile strength and modulus, and lower water vapor permeability as compared to plant sourced CNC. These properties are higher for nanocomposites prepared under MF. The modulus of starch nanocomposites increased from 0.26 GPa and 0.32 GPa to 0.38 GPa and 0.44 GPa, respectively for plant-CNC and tunicate-CNC when exposed to MF. The improved orientation and alignment of CNC in presence of MF is further supported by Raman and scanning electron micrographs studies.
Collapse
|
205
|
Li Z, Shi S, Yang F, Cao D, Zhang K, Wang B, Ma Z, Pan L, Li Y. Supertough and Transparent Poly(lactic acid) Nanostructure Blends with Minimal Stiffness Loss. ACS OMEGA 2020; 5:13148-13157. [PMID: 32548501 PMCID: PMC7288571 DOI: 10.1021/acsomega.0c01165] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 05/12/2020] [Indexed: 05/04/2023]
Abstract
This contribution is an attempt to explore the effectiveness of a series of newly obtained thermoplastic elastomers (TPEs) as a toughening agent for modifying poly(lactic acid) (PLA). The TPEs, including ionically modified isotactic polypropylene-graft-PLA (iPP-g-PLA) copolymers with explicit graft length, graft density, and ionic group content, and an iPP-g-PLA copolymer with a very high molecular weight and explicit graft density, were elaborately designed and synthesized. The semicrystal or rubbery copolymer backbone originated from iPP was designed to improve the toughness and maintain a relatively high strength, while the grafted PLA side chain was to ensure a high level of compatibility with the PLA matrix. To obtain further enhancement in interfacial reinforcement, the imidazolium-based ionic group was also added during graft onto reaction. All of these graft copolymers were identified with randomly distributed PLA branches, bearing a very high molecular weight ((33-398) × 104) and very high PLA content (57.3-89.3 wt %). Unprecedentedly, with a very small amount of newly designed TPE, the modified PLA blends exhibited a significantly increased elongation at break (up to about 190%) and simultaneously retained the very high stiffness and excellent transparency. The nanometer-scale phase-separated particles with good compatibility and refractive index matching to the PLA matrix were demonstrated to play a crucial role in the excellent performance. The findings suggested that the newly designed iPP-g-PLA copolymers are very economic, promising, and effective modifying agents for developing highly transparent and tough PLA-based sustainable materials.
Collapse
Affiliation(s)
- Zhaoxin Li
- Tianjin
Key Lab of Composite & Functional Materials, School of Materials
Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Shuwen Shi
- Tianjin
Key Lab of Composite & Functional Materials, School of Materials
Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Fei Yang
- Tianjin
Key Lab of Composite & Functional Materials, School of Materials
Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Dafu Cao
- Tianjin
Key Lab of Composite & Functional Materials, School of Materials
Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Kunyu Zhang
- School
of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
| | - Bin Wang
- Tianjin
Key Lab of Composite & Functional Materials, School of Materials
Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Zhe Ma
- Tianjin
Key Lab of Composite & Functional Materials, School of Materials
Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Li Pan
- Tianjin
Key Lab of Composite & Functional Materials, School of Materials
Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Yuesheng Li
- Tianjin
Key Lab of Composite & Functional Materials, School of Materials
Science and Engineering, Tianjin University, Tianjin 300072, China
- Collaborative
Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| |
Collapse
|
206
|
Ambone T, Torris A, Shanmuganathan K. Enhancing the mechanical properties of
3D
printed polylactic acid using nanocellulose. POLYM ENG SCI 2020. [DOI: 10.1002/pen.25421] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Tushar Ambone
- Polymer Science and Engineering Division, CSIR‐National Chemical Laboratory Dr. Homibhabha Road Pune 411008 India
- Academy of Scientific and Innovative Research, CSIR‐National Chemical Laboratory Dr. Homibhabha Road Pune 411008 India
| | - Arun Torris
- Polymer Science and Engineering Division, CSIR‐National Chemical Laboratory Dr. Homibhabha Road Pune 411008 India
| | - Kadhiravan Shanmuganathan
- Polymer Science and Engineering Division, CSIR‐National Chemical Laboratory Dr. Homibhabha Road Pune 411008 India
- Academy of Scientific and Innovative Research, CSIR‐National Chemical Laboratory Dr. Homibhabha Road Pune 411008 India
| |
Collapse
|
207
|
Sanusi OM, Papadopoulos L, Klonos PA, Terzopoulou Z, Hocine NA, Benelfellah A, Papageorgiou GZ, Kyritsis A, Bikiaris DN. Calorimetric and Dielectric Study of Renewable Poly(hexylene 2,5-furan-dicarboxylate)-Based Nanocomposites In Situ Filled with Small Amounts of Graphene Platelets and Silica Nanoparticles. Polymers (Basel) 2020; 12:E1239. [PMID: 32485937 PMCID: PMC7362010 DOI: 10.3390/polym12061239] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 05/22/2020] [Accepted: 05/22/2020] [Indexed: 11/21/2022] Open
Abstract
Poly(hexylene 2,5 furan-dicarboxylate) (PHF) is a relatively new biobased polyester prepared from renewable resources, which is targeted for use in food packaging applications, owing to its great mechanical and gas barrier performance. Since both properties are strongly connected to crystallinity, the latter is enhanced here by the in situ introduction in PHF of graphene nanoplatelets and fumed silica nanoparticles, as well as mixtures of both, at low amounts. For this investigation, we employed Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and dielectric spectroscopy (BDS). The fillers were found to improve crystallization in both the rate (increasing Tc) and fraction (CF), which was rationalized via the concept of fillers acting as crystallization agents. This action was found stronger in the case of graphene as compared to silica. BDS allowed the detection of local and segmental dynamics, in particular in PHF for the first time. The glass transition dynamics in both BDS (α relaxation) and DSC (Tg) are mainly dominated by the relatively high CF, whereas in the PHF filled uniquely with silica strong spatial confinement effects due to crystals were revealed. Finally, all samples demonstrated the segmental-like dynamics above Tg, which screens the global chain dynamics (normal mode).
Collapse
Affiliation(s)
- Olawale Monsur Sanusi
- INSA CVL, Univ. Tours, Univ. Orléans, LaMé, 3 Rue de la Chocolaterie, CS 23410, CEDEX 41034 Blois, France; (O.M.S.); (N.A.H.); (A.B.)
| | - Lazaros Papadopoulos
- Department of Chemistry, Laboratory of Polymer Chemistry and Technology, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece; (L.P.); (Z.T.)
| | - Panagiotis A. Klonos
- Department of Chemistry, Laboratory of Polymer Chemistry and Technology, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece; (L.P.); (Z.T.)
- Department of Physics, National Technical University of Athens, Zografou Campus, 15780 Athens, Greece;
| | - Zoi Terzopoulou
- Department of Chemistry, Laboratory of Polymer Chemistry and Technology, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece; (L.P.); (Z.T.)
| | - Nourredine Aït Hocine
- INSA CVL, Univ. Tours, Univ. Orléans, LaMé, 3 Rue de la Chocolaterie, CS 23410, CEDEX 41034 Blois, France; (O.M.S.); (N.A.H.); (A.B.)
| | - Abdelkibir Benelfellah
- INSA CVL, Univ. Tours, Univ. Orléans, LaMé, 3 Rue de la Chocolaterie, CS 23410, CEDEX 41034 Blois, France; (O.M.S.); (N.A.H.); (A.B.)
- DRII, IPSA, 63 Boulevard de Brandebourg, 94200 Ivry-Sur-Seine, France
| | - George Z. Papageorgiou
- Laboratory of Industrial and Food chemistry, Chemistry Department, University of Ioannina, 45110 Ioannina, Greece;
| | - Apostolos Kyritsis
- Department of Physics, National Technical University of Athens, Zografou Campus, 15780 Athens, Greece;
| | - Dimitrios N. Bikiaris
- Department of Chemistry, Laboratory of Polymer Chemistry and Technology, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece; (L.P.); (Z.T.)
| |
Collapse
|
208
|
Abstract
With the rapid exhaustion of fossil resources, and environmental pollution relative to the use of fossil-based products, developing eco-friendly products using biomass and/or biodegradable resources is becoming increasingly conspicuous. In this study, ecofriendly and biodegradable composite membranes containing varying MC/PLA (methylcellulose/polylactic acid) mass ratios were prepared. The properties and structures of the MC/PLA membranes were studied by mechanical testing, 13C NMR techniques, X-ray diffraction (XRD), thermogravimetric analysis (TGA), and hot compression. The MC/PLA membranes displayed markedly improved tensile strength and elongation at the MC/PLA mass ratio range of 99:1 to 9:1. The tensile strength and elongation of the MC/PLA (97:3) membrane was found to be the optimum, at 30% and 35% higher than the neat MC, respectively. It was also found that hot compression could improve the tensile strength and elongation of the membranes. At the same time, the membranes showed enough good thermal stability. In addition, the effect of MC/PLA mass ratio on morphologies of the membranes were studied by microscopy technique.
Collapse
|
209
|
Singha S, Hedenqvist MS. A Review on Barrier Properties of Poly(Lactic Acid)/Clay Nanocomposites. Polymers (Basel) 2020; 12:E1095. [PMID: 32403371 PMCID: PMC7285356 DOI: 10.3390/polym12051095] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 04/29/2020] [Accepted: 05/01/2020] [Indexed: 12/04/2022] Open
Abstract
Poly(lactic acid) (PLA) is considered to be among the best biopolymer substitutes for the existing petroleum-based polymers in the field of food packaging owing to its renewability, biodegradability, non-toxicity and mechanical properties. However, PLA displays only moderate barrier properties to gases, vapors and organic compounds, which can limit its application as a packaging material. Hence, it becomes essential to understand the mass transport properties of PLA and address the transport challenges. Significant improvements in the barrier properties can be achieved by incorporating two-dimensional clay nanofillers, the planes of which create tortuosity to the diffusing molecules, thereby increasing the effective length of the diffusion path. This article reviews the literature on barrier properties of PLA/clay nanocomposites. The important PLA/clay nanocomposite preparation techniques, such as solution intercalation, melt processing and in situ polymerization, are outlined followed by an extensive account of barrier performance of nanocomposites drawn from the literature. Fundamentals of mass transport phenomena and the factors affecting mass transport are also presented. Furthermore, mathematical models that have been proposed/used to predict the permeability in polymer/clay nanocomposites are reviewed and the extent to which the models are validated in PLA/clay composites is discussed.
Collapse
Affiliation(s)
- Shuvra Singha
- KTH Royal Institute of Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Fibre and Polymer Technology, SE-100 44 Stockholm, Sweden
| | - Mikael S. Hedenqvist
- KTH Royal Institute of Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Fibre and Polymer Technology, SE-100 44 Stockholm, Sweden
| |
Collapse
|
210
|
Narancic T, Cerrone F, Beagan N, O’Connor KE. Recent Advances in Bioplastics: Application and Biodegradation. Polymers (Basel) 2020; 12:E920. [PMID: 32326661 PMCID: PMC7240402 DOI: 10.3390/polym12040920] [Citation(s) in RCA: 88] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 04/07/2020] [Accepted: 04/13/2020] [Indexed: 12/12/2022] Open
Abstract
The success of oil-based plastics and the continued growth of production and utilisation can be attributed to their cost, durability, strength to weight ratio, and eight contributions to the ease of everyday life. However, their mainly single use, durability and recalcitrant nature have led to a substantial increase of plastics as a fraction of municipal solid waste. The need to substitute single use products that are not easy to collect has inspired a lot of research towards finding sustainable replacements for oil-based plastics. In addition, specific physicochemical, biological, and degradation properties of biodegradable polymers have made them attractive materials for biomedical applications. This review summarises the advances in drug delivery systems, specifically design of nanoparticles based on the biodegradable polymers. We also discuss the research performed in the area of biophotonics and challenges and opportunities brought by the design and application of biodegradable polymers in tissue engineering. We then discuss state-of-the-art research in the design and application of biodegradable polymers in packaging and emphasise the advances in smart packaging development. Finally, we provide an overview of the biodegradation of these polymers and composites in managed and unmanaged environments.
Collapse
Affiliation(s)
- Tanja Narancic
- UCD Earth Institute and School of Biomolecular and Biomedical Science, University College Dublin, Belfield, 4, D04 N2E5 Dublin, Ireland; (T.N.); (F.C.); (N.B.)
- BiOrbic - Bioeconomy Research Centre, University College Dublin, Belfield, 4, D04 N2E5 Dublin, Ireland
| | - Federico Cerrone
- UCD Earth Institute and School of Biomolecular and Biomedical Science, University College Dublin, Belfield, 4, D04 N2E5 Dublin, Ireland; (T.N.); (F.C.); (N.B.)
- BiOrbic - Bioeconomy Research Centre, University College Dublin, Belfield, 4, D04 N2E5 Dublin, Ireland
| | - Niall Beagan
- UCD Earth Institute and School of Biomolecular and Biomedical Science, University College Dublin, Belfield, 4, D04 N2E5 Dublin, Ireland; (T.N.); (F.C.); (N.B.)
| | - Kevin E. O’Connor
- UCD Earth Institute and School of Biomolecular and Biomedical Science, University College Dublin, Belfield, 4, D04 N2E5 Dublin, Ireland; (T.N.); (F.C.); (N.B.)
- BiOrbic - Bioeconomy Research Centre, University College Dublin, Belfield, 4, D04 N2E5 Dublin, Ireland
- School of Biomolecular and Biomedical Sciences, Earth Institute, O’Brien Centre for Science, University College Dublin, Belfield, 4, D04 N2E5 Dublin, Ireland
| |
Collapse
|
211
|
Poly(lactic Acid)-Biochar Biocomposites: Effect of Processing and Filler Content on Rheological, Thermal, and Mechanical Properties. Polymers (Basel) 2020; 12:polym12040892. [PMID: 32290601 PMCID: PMC7240653 DOI: 10.3390/polym12040892] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 04/08/2020] [Accepted: 04/11/2020] [Indexed: 01/24/2023] Open
Abstract
Biocomposites based on poly(lactic acid) (PLA) and biochar (BC) particles derived from spent ground coffee were prepared using two different processing routes, namely melt mixing and solvent casting. The formulated biocomposites were characterized through rheological, thermal, and mechanical analyses, aiming at evaluating the effects of the filler content and of the processing method on their final properties. The rheological characterization demonstrated the effectiveness of both exploited strategies in achieving a good level of filler dispersion within the matrix, notwithstanding the occurrence of a remarkable decrease of the PLA molar mass during the processing at high temperature. Nevertheless, significant alterations of the PLA rheological behavior were observed in the composites obtained by melt mixing. Differential scanning calorimetry (DSC) measurements indicated a remarkable influence of the processing method on the thermal behavior of biocomposites. More specifically, melt mixing caused the appearance of two melting peaks, though the structure of the materials remained almost amorphous; conversely, a significant increase of the crystalline phase content was observed for solvent cast biocomposites containing low amounts of filler that acted as nucleating agents. Finally, thermogravimetric analyses suggested a catalytic effect of BC particles on the degradation of PLA; its biocomposites showed decreased thermal stability as compared with the neat PLA matrix.
Collapse
|
212
|
Feng C, Chen Y, Shao J, Hou H. The Crystallization Behavior of Poly(l-lactic acid)/Poly(d-lactic acid) Electrospun Fibers: Effect of Distance of Isomeric Polymers. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c00625] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Congshu Feng
- College of Chemistry & Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Yun Chen
- College of Chemistry & Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Jun Shao
- College of Chemistry & Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and Jiangxi’s Key Laboratory of Green Chemistry, Jiangxi Normal University, Nanchang 330022, China
- Nanofiber Engineering Center of Jiangxi Province, Jiangxi Normal University, Nanchang 330022, China
| | - Haoqing Hou
- College of Chemistry & Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and Jiangxi’s Key Laboratory of Green Chemistry, Jiangxi Normal University, Nanchang 330022, China
- Nanofiber Engineering Center of Jiangxi Province, Jiangxi Normal University, Nanchang 330022, China
| |
Collapse
|
213
|
Physico‐chemical, thermal, and mechanical properties of
PLA‐nHA
nanocomposites: Effect of glass fiber reinforcement. J Appl Polym Sci 2020. [DOI: 10.1002/app.49286] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
214
|
Gendviliene I, Simoliunas E, Rekstyte S, Malinauskas M, Zaleckas L, Jegelevicius D, Bukelskiene V, Rutkunas V. Assessment of the morphology and dimensional accuracy of 3D printed PLA and PLA/HAp scaffolds. J Mech Behav Biomed Mater 2020; 104:103616. [DOI: 10.1016/j.jmbbm.2020.103616] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 12/30/2019] [Accepted: 01/01/2020] [Indexed: 01/05/2023]
|
215
|
Coltelli MB, Aliotta L, Vannozzi A, Morganti P, Panariello L, Danti S, Neri S, Fernandez-Avila C, Fusco A, Donnarumma G, Lazzeri A. Properties and Skin Compatibility of Films Based on Poly(Lactic Acid) (PLA) Bionanocomposites Incorporating Chitin Nanofibrils (CN). J Funct Biomater 2020; 11:E21. [PMID: 32244595 PMCID: PMC7353621 DOI: 10.3390/jfb11020021] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 03/12/2020] [Accepted: 03/18/2020] [Indexed: 02/07/2023] Open
Abstract
Nanobiocomposites suitable for preparing skin compatible films by flat die extrusion were prepared by using plasticized poly(lactic acid) (PLA), poly(butylene succinate-co-adipate) (PBSA), and Chitin nanofibrils as functional filler. Chitin nanofibrils (CNs) were dispersed in the blends thanks to the preparation of pre-nanocomposites containing poly(ethylene glycol). Thanks to the use of a melt strength enhancer (Plastistrength) and calcium carbonate, the processability and thermal properties of bionanocomposites films containing CNs could be tuned in a wide range. Moreover, the resultant films were flexible and highly resistant. The addition of CNs in the presence of starch proved not advantageous because of an extensive chain scission resulting in low values of melt viscosity. The films containing CNs or CNs and calcium carbonate resulted biocompatible and enabled the production of cells defensins, acting as indirect anti-microbial. Nevertheless, tests made with Staphylococcus aureus and Enterobacter spp. (Gram positive and negative respectively) by the qualitative agar diffusion test did not show any direct anti-microbial activity of the films. The results are explained considering the morphology of the film and the different mechanisms of direct and indirect anti-microbial action generated by the nanobiocomposite based films.
Collapse
Affiliation(s)
- Maria-Beatrice Coltelli
- Department of Civil and Industrial Engineering, University of Pisa, 56122 Pisa, Italy; (L.A.); (A.V.); (L.P.); (S.D.); (A.F.); (G.D.); (A.L.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), 50121 Florence, Italy
| | - Laura Aliotta
- Department of Civil and Industrial Engineering, University of Pisa, 56122 Pisa, Italy; (L.A.); (A.V.); (L.P.); (S.D.); (A.F.); (G.D.); (A.L.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), 50121 Florence, Italy
| | - Alessandro Vannozzi
- Department of Civil and Industrial Engineering, University of Pisa, 56122 Pisa, Italy; (L.A.); (A.V.); (L.P.); (S.D.); (A.F.); (G.D.); (A.L.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), 50121 Florence, Italy
| | | | - Luca Panariello
- Department of Civil and Industrial Engineering, University of Pisa, 56122 Pisa, Italy; (L.A.); (A.V.); (L.P.); (S.D.); (A.F.); (G.D.); (A.L.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), 50121 Florence, Italy
| | - Serena Danti
- Department of Civil and Industrial Engineering, University of Pisa, 56122 Pisa, Italy; (L.A.); (A.V.); (L.P.); (S.D.); (A.F.); (G.D.); (A.L.)
| | - Simona Neri
- IRIS Technology Solutions S.L, 08860 Castelldefels, Barcelona, Spain; (S.N.); (C.F.-A.)
| | | | - Alessandra Fusco
- Department of Civil and Industrial Engineering, University of Pisa, 56122 Pisa, Italy; (L.A.); (A.V.); (L.P.); (S.D.); (A.F.); (G.D.); (A.L.)
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy
| | - Giovanna Donnarumma
- Department of Civil and Industrial Engineering, University of Pisa, 56122 Pisa, Italy; (L.A.); (A.V.); (L.P.); (S.D.); (A.F.); (G.D.); (A.L.)
- Department of Experimental Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy
| | - Andrea Lazzeri
- Department of Civil and Industrial Engineering, University of Pisa, 56122 Pisa, Italy; (L.A.); (A.V.); (L.P.); (S.D.); (A.F.); (G.D.); (A.L.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), 50121 Florence, Italy
| |
Collapse
|
216
|
Liu W, Zhu X, Gao H, Su X, Wu X. Preparation and characterization of PLA foam chain extended through grafting octa(epoxycyclohexyl) POSS onto carbon nanotubes. CELLULAR POLYMERS 2020. [DOI: 10.1177/0262489320912521] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Improving foamability of poly (lactic acid) (PLA) resin is a key issue for its critical foaming applications with high-performance and ultralow density. However, owing to the rheological nature of linear PLA chain structure with relatively low molecular weight, the overall foamability of PLA resin cannot meet the processing requirements of foaming purpose. Here, we describe a simple and versatile technique to prepare high foamability PLA resin by inducing chain extender through grafting octa(epoxycyclohexyl) polyhedral oligomeric silsesquioxanes (POSS) on carbon nanotubes (CNT). After the orderly assemble of the two nanoparticles, an obvious increase in melt elasticity of PLA is observed. The enhanced melt elasticity of PLA had a significant effect on controlling subsequent foaming behavior. Thus, a homogeneous and finer cellular morphology of PLA rigid foam was obtained with a proper content of CNT-POSS. Eventually, the expansion ratio of chain-extended PLA foam was 13 times higher than that of unmodified PLA foam. The proposed design methodology will potentially pave a way for designing and preparing high-performance PLA rigid foam products.
Collapse
Affiliation(s)
- Wei Liu
- School of Materials and Metallurgical Engineering, Guizhou Institute of Technology, Guiyang City, Guizhou Province, People’s Republic of China
| | - Xunxian Zhu
- School of Materials and Metallurgical Engineering, Guizhou Institute of Technology, Guiyang City, Guizhou Province, People’s Republic of China
| | - Hongxiang Gao
- School of Materials and Metallurgical Engineering, Guizhou Institute of Technology, Guiyang City, Guizhou Province, People’s Republic of China
| | - Xiangdong Su
- Key Laboratory of Light Metal Materials Processing Technology of Guizhou Province, Guizhou Institute of Technology, Guiyang, Guizhou, People’s Republic of China
| | - Xian Wu
- School of Materials and Metallurgical Engineering, Guizhou Institute of Technology, Guiyang City, Guizhou Province, People’s Republic of China
| |
Collapse
|
217
|
Cao X, Chi X, Deng X, Liu T, Yu B, Wang B, Yuen ACY, Wu W, Li RKY. Synergistic effect of flame retardants and graphitic carbon nitride on flame retardancy of polylactide composites. POLYM ADVAN TECHNOL 2020. [DOI: 10.1002/pat.4894] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Xianwu Cao
- National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering of Ministry of Education, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing South China University of Technology Guangzhou China
| | - Xiaoning Chi
- National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering of Ministry of Education, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing South China University of Technology Guangzhou China
| | - Xueqin Deng
- National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering of Ministry of Education, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing South China University of Technology Guangzhou China
| | - Tao Liu
- Department of Materials Science and Engineering City University of Hong Kong Hong Kong China
| | - Bin Yu
- Centre for Future Materials University of Southern Queensland Toowoomba Queensland Australia
| | - Bin Wang
- Key Laboratory of Polymer Micro/Nano Manufacturing and Devices East China University of Technology Nanchang China
| | - Anthony C. Y. Yuen
- School of Mechanical and Manufacturing Engineering University of New South Wales Sydney New South Wales Australia
| | - Wei Wu
- National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering of Ministry of Education, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing South China University of Technology Guangzhou China
- Department of Materials Science and Engineering City University of Hong Kong Hong Kong China
| | - Robert K. Y. Li
- Department of Materials Science and Engineering City University of Hong Kong Hong Kong China
| |
Collapse
|
218
|
Cardoso PHM, Teixeira BN, Calado VMDA, Oliveira MG, Mendonça TDS, Mendonça RH, Almeida HRO, Cunha MS, Thiré RMDSM. Mechanical and dimensional performance of poly(lactic acid) 3D‐printed parts using thin plate spline interpolation. J Appl Polym Sci 2020. [DOI: 10.1002/app.49171] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Paulo Henrique Machado Cardoso
- Program of Metallurgical and Materials Engineering, COPPEFederal University of Rio de Janeiro – UFRJ Rio de Janeiro Brazil
| | - Bruna Nunes Teixeira
- Program of Metallurgical and Materials Engineering, COPPEFederal University of Rio de Janeiro – UFRJ Rio de Janeiro Brazil
| | | | - Márcia Gomes Oliveira
- Materials Characterization and Processing DepartmentNational Institute of Technology – INT Rio de Janeiro Brazil
| | | | - Roberta Helena Mendonça
- Postgraduate Program of Chemical Engineering/DEQFederal Rural University of Rio de Janeiro Seropédica Brazil
| | | | - Matheus Santos Cunha
- Postgraduate Program of Chemical Engineering/DEQFederal Rural University of Rio de Janeiro Seropédica Brazil
| | | |
Collapse
|
219
|
Synthesis, characterization, and crystallization behaviors of poly( D-lactic acid)-based triblock copolymer. Sci Rep 2020; 10:3627. [PMID: 32107422 PMCID: PMC7046728 DOI: 10.1038/s41598-020-60458-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Accepted: 01/23/2020] [Indexed: 12/22/2022] Open
Abstract
Poly(D-lactic acid) (PDLA) with different polyethylene glycol (PEG) segment synthesized PDLA-PEG-PDLA triblock copolymer through the ring-opening reaction of D-LA and PEG will be used as a toughening modifier. The microstructure, crystal structures and crystallization behaviors of this triblock copolymer were investigated by Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC) and polarized optical microscopy (POM). The triblock copolymer is synthesized from the appearance of CH2 stretching vibration peak at 2910 cm−1 and C-O stretching vibration peak at 1200 cm−1 from PEG in FTIR spectra. Moreover, the chemical shift that is about 3.6 ppm in 1H NMR and 68.8ppm in 13C NMR proves this matter. The results of XRD and DSC reveal that PDLA and PEG are crystallized separately, and are not fully compatible, and microphase separation has occurred in this triblock copolymer. PEG can induce the triblock copolymer to accelerate the rate of crystallization, allowing it to crystallize more completely in the same amount of time. When the molecular weight of PEG is 6000 or the ratio of D-LA/PEG is 1/1, the crystallizability of PDLA-PEG-PDLA triblock copolymer is the best.
Collapse
|
220
|
Biocomposite Fabrication from Enzymatically Treated Nanocellulosic Fibers and Recycled Polylactic Acid. ENERGIES 2020. [DOI: 10.3390/en13041003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Recycled polylactic acid (PLAr) was reinforced with treated nanocellulosic hemp fibers for biocomposite fabrication. Cellulosic fibers were extracted from hemp fibers chemically and treated enzymatically. Treated nanocellulosic fibers (NCF) were analyzed by Fourier-transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy. Biocomposite fabrication was done with PLAr and three concentrations of treated NCF (0.1%, 0.25%, and 1% (v/v)) and then studied for thermal stability and mechanical properties. Increased thermal stability was observed with increasing NCF concentrations. The highest value for Young’s modulus was for PLAr + 0.25% (v/v) NCF (250.28 ± 5.47 MPa), which was significantly increased compared to PLAr (p = 0.022). There was a significant decrease in the tensile stress at break point for PLAr + 0.25% (v/v) NCF and PLAr + 1% (v/v) NCF as compared to control (p = 0.006 and 0.002, respectively). No significant difference was observed between treatments for tensile stress at yield.
Collapse
|
221
|
González DM, Cruz NB, Hernández LA, Oyarce J, Benavente R, Manzur C. Bis‐β‐(diketonates) Zn(II) complexes substituted with thiophene: Electropolymerization, homogeneous and heterogeneous catalysis for ring opening polymerization of lactide. JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1002/pol.20190103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Darío M. González
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Campus Curauma Valparaíso Chile
| | - Nicole B. Cruz
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Campus Curauma Valparaíso Chile
| | - Loreto A. Hernández
- Laboratorio de Electroquímica, Instituto de Química y Bioquímica, Facultad de CienciasUniversidad de Valparaíso Avda. Gran Bretaña 1111, Playa Ancha, Valparaíso Chile
| | - Jocelyn Oyarce
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Campus Curauma Valparaíso Chile
| | - Rosario Benavente
- Instituto de Ciencia y Tecnología de Polímeros (ICTP‐CSIC) Juan de la Cierva, 3 28006 Madrid Spain
| | - Carolina Manzur
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Campus Curauma Valparaíso Chile
| |
Collapse
|
222
|
Lizundia E, Reizabal A, Costa CM, Maceiras A, Lanceros-Méndez S. Electroactive γ-Phase, Enhanced Thermal and Mechanical Properties and High Ionic Conductivity Response of Poly (Vinylidene Fluoride)/Cellulose Nanocrystal Hybrid Nanocomposites. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E743. [PMID: 32041217 PMCID: PMC7040804 DOI: 10.3390/ma13030743] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 01/29/2020] [Accepted: 02/04/2020] [Indexed: 01/30/2023]
Abstract
Cellulose nanocrystals (CNCs) were incorporated into poly (vinylidene fluoride) (PVDF) to tailor the mechanical and dielectric properties of this electroactive polymer. PVDF/CNC nanocomposites with concentrations up to 15 wt.% were prepared by solvent-casting followed by quick vacuum drying in order to ensure the formation of the electroactive γ-phase. The changes induced by the presence of CNCs on the morphology of PVDF and its crystalline structure, thermal properties, mechanical performance and dielectric behavior are explored. The results suggest a relevant role of the CNC surface -OH groups, which interact with PVDF fluorine atoms. The real dielectric constant ε' of nanocomposites at 200 Hz was found to increase by 3.6 times up to 47 for the 15 wt.% CNC nanocomposite due to an enhanced ionic conductivity provided by CNCs. The approach reported here in order to boost the formation of the γ-phase of PVDF upon the incorporation of CNCs serves to further develop cellulose-based multifunctional materials.
Collapse
Affiliation(s)
- Erlantz Lizundia
- Department of Graphic Design and Engineering Projects, Bilbao Faculty of Engineering, University of the Basque Country (UPV/EHU), 48013 Bilbao, Spain
- BC Materials, Basque Center Centre for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain; (A.R.); (A.M.); (S.L.-M.)
| | - Ander Reizabal
- BC Materials, Basque Center Centre for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain; (A.R.); (A.M.); (S.L.-M.)
| | - Carlos M. Costa
- Centro de Física, Universidade do Minho, 4710-057 Braga, Portugal
- Centro de Química, Universidade do Minho, 4710-057 Braga, Portugal
| | - Alberto Maceiras
- BC Materials, Basque Center Centre for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain; (A.R.); (A.M.); (S.L.-M.)
| | - Senentxu Lanceros-Méndez
- BC Materials, Basque Center Centre for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain; (A.R.); (A.M.); (S.L.-M.)
- IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain
| |
Collapse
|
223
|
Zhang X, Ao CK, Soh S. Nonconductive Noncharging Composites: Tunable and Stretchable Materials for Adaptive Prevention of Charging by Contact Electrification. ACS APPLIED MATERIALS & INTERFACES 2020; 12:5274-5285. [PMID: 31769961 DOI: 10.1021/acsami.9b16682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Static charge generated by contact electrification can cause a wide range of undesirable consequences in our lives and in industry (e.g., adhesion of particles on surfaces, damage to electronics, and explosions). It has, however, been challenging to develop methods to prevent charging due to the vast types of materials that charge easily by contact electrification and the frequent changes in process and environmental conditions. The most common method is to use conductive materials for dissipating charge away; however, it is ineffective for many circumstances. Here, we propose a general and effective materials framework that involves a two-level consideration for preparing noncharging materials: (1) the variation of the proportion of a two-material composite and (2) the extent of stretching the composite material. This materials strategy is achieved by infusing particles within a stretchable bulk material. Importantly, the preparation of the noncharging surface for (1) is based on a novel fundamental mechanism that involves combining an appropriate amount of a material (e.g., the particles) that tends to charge positively with another material (e.g., the bulk material) that tends to charge negatively. This mechanism does not rely on conductivity; both the contacting materials naturally prevent the generation of static charge even when only nonconductive materials are involved. When the composite material is stretchable, the change in proportion of the surface coverage of the particles allows the charging response to be changed. Therefore, the variation in composition and stretching provide a wide two-dimensional parameter space for achieving noncharging response for the vast range of contacting materials that are used in industry and our lives. In addition, stretchability allows the composite material to flexibly adapt to changes in process and environmental conditions. This stretchable composite material was also demonstrated to be capable of preventing the adhesion of particles and separating particles of different materials.
Collapse
Affiliation(s)
- Xuan Zhang
- Department of Chemical and Biomolecular Engineering , National University of Singapore , 4 Engineering Drive 4 , Singapore 117585 , Singapore
| | - Chi Kit Ao
- Department of Chemical and Biomolecular Engineering , National University of Singapore , 4 Engineering Drive 4 , Singapore 117585 , Singapore
| | - Siowling Soh
- Department of Chemical and Biomolecular Engineering , National University of Singapore , 4 Engineering Drive 4 , Singapore 117585 , Singapore
| |
Collapse
|
224
|
Jiang J, Yang S, Li L, Bai S. High thermal conductivity polylactic acid composite for 3D printing: Synergistic effect of graphene and alumina. POLYM ADVAN TECHNOL 2020. [DOI: 10.1002/pat.4858] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Jun Jiang
- State Key Laboratory of Polymer Materials EngineeringPolymer Research Institute of Sichuan University Chengdu China
| | - Shuangqiao Yang
- State Key Laboratory of Polymer Materials EngineeringPolymer Research Institute of Sichuan University Chengdu China
| | - Linhuan Li
- State Key Laboratory of Polymer Materials EngineeringPolymer Research Institute of Sichuan University Chengdu China
| | - Shibing Bai
- State Key Laboratory of Polymer Materials EngineeringPolymer Research Institute of Sichuan University Chengdu China
| |
Collapse
|
225
|
Yu X, Jin XZ, Huang T, Zhang N, Li XY, Wang Y. Poly(methyl methacrylate)-induced Microstructure and Hydrolysis Behavior Changes of Poly(L-lactic acid)/Carbon Nanotubes Composites. CHINESE JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1007/s10118-019-2323-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
226
|
Shahnooshi M, Javadi A, Nazockdast H, Altstädt V. Development of in situ nanofibrillar poly (lactic acid)/poly (butylene terephthalate) composites: Non-isothermal crystallization and crystal morphology. Eur Polym J 2020. [DOI: 10.1016/j.eurpolymj.2020.109489] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
227
|
Papadopoulos L, Klonos PA, Tzetzis D, Papageorgiou GZ, Kyritsis A, Bikiaris DN. Effects of graphene nanoplatelets on crystallization, mechanical performance and molecular dynamics of the renewable poly(propylene furanoate). POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122172] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
228
|
Mokhena TC, John MJ. Esterified cellulose nanofibres from saw dust using vegetable oil. Int J Biol Macromol 2020; 148:1109-1117. [PMID: 32004608 DOI: 10.1016/j.ijbiomac.2020.01.278] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 12/16/2019] [Accepted: 01/28/2020] [Indexed: 12/20/2022]
Abstract
In this work, cellulose nanofibres (CNFs) were extracted from sawdust, which is an underutilized by-product from the wood and timber industry. The extracted CNFs by chemical and mechanical treatments had a web-like structure with diameters ranging between 2 nm and 27 nm and lengths reaching a few microns. The obtained CNFs were further chemically modified with vegetable canola oil using two different esterification processes. In order to compare the effect of the surface modification of CNFs, the nanopapers were prepared from their prospective suspensions through solvent evaporation method, and then characterize with Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA), UV-vis spectroscopy and tensile tester. FTIR results indicated that both methods led to a successful grafting of the long chain hydrocarbon structure onto the CNFs, and became more hydrophobic when compared to unmodified CNFs-based nanopapers. The crystallinity, mechanical, light transmittance and thermal properties were significantly affected primarily by the esterification method employed, thus the degree of substitution. It was found that high degree of substitution adversely affected the crystallinity, light transmittance, mechanical and thermal properties. The crystallinity decreased from 70% to <40% when the degree of substation was about 0.8.
Collapse
Affiliation(s)
- T C Mokhena
- CSIR Materials Science and Manufacturing, Polymers and Composites, Port Elizabeth, South Africa; Department of Chemistry, Nelson Mandela University, Port Elizabeth, South Africa.
| | - M J John
- CSIR Materials Science and Manufacturing, Polymers and Composites, Port Elizabeth, South Africa; Department of Chemistry, Nelson Mandela University, Port Elizabeth, South Africa; Organisational Unit, School of Mechanical, Industrial & Aeronautical Engineering, University of the Witwatersrand, Johannesburg, South Africa.
| |
Collapse
|
229
|
Russo P, Venezia V, Tescione F, Avossa J, Luciani G, Silvestri B, Costantini A. Improving Interaction at Polymer-Filler Interface: The Efficacy of Wrinkle Texture. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E208. [PMID: 31991718 PMCID: PMC7074972 DOI: 10.3390/nano10020208] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Revised: 01/16/2020] [Accepted: 01/22/2020] [Indexed: 01/13/2023]
Abstract
One of the main issues in preparing polymer-based nanocomposites with effective properties is to achieve a good dispersion of the nanoparticles into the matrix. Chemical interfacial modifications by specific coupling agents represents a good way to reach this objective. Actually, time consuming compatibilization procedures strongly compromise the sustainability of these strategies. In this study, the role of particles' architectures in their dispersion into a poly-lactic acid matrix and their subsequent influences on physical-chemical properties of the obtained nanocomposites were investigated. Two kinds of silica nanoparticles, "smooth" and "wrinkled," with different surface areas (≈30 and ≈600 m2/g respectively) were synthesized through a modified Stöber method and used, without any chemical surface pre-treatments, as fillers to produce poly-lactic acid based nanocomposites. The key role played by wrinkled texture in modifying the physical interaction at the polymer-filler interface and in driving composite properties, was investigated and reflected in the final bulk properties. Detailed investigations revealed the presence of wrinkled nanoparticles, leading to (i) an enormous increase of the chain relaxation time, by almost 30 times compared to the neat PLA matrix; (ii) intensification of the shear-thinning behavior at low shear-rates; and (iii) slightly slower thermal degradation of polylactic acid.
Collapse
Affiliation(s)
- Pietro Russo
- Institute for Polymers, Composites and Biomaterials, National Research Council, via Campi Flegrei 34, 80078 Pozzuoli-Naples, Italy;
| | - Virginia Venezia
- Department of Chemical, Materials and Production Engineering, University of Naples “Federico II”, p.le V. Tecchio 80, 80125 Naples, Italy; (V.V.); (G.L.); (A.C.)
| | - Fabiana Tescione
- Institute for Polymers, Composites and Biomaterials, National Research Council, Portici, 80055 Naples, Italy;
| | - Joshua Avossa
- Institute of Atmospheric Pollution Research-National Research Council (IIA-CNR), Research Area of Rome 1, via Salaria Km 29,300, 00016 Monterotondo, Italy;
| | - Giuseppina Luciani
- Department of Chemical, Materials and Production Engineering, University of Naples “Federico II”, p.le V. Tecchio 80, 80125 Naples, Italy; (V.V.); (G.L.); (A.C.)
| | - Brigida Silvestri
- Department of Chemical, Materials and Production Engineering, University of Naples “Federico II”, p.le V. Tecchio 80, 80125 Naples, Italy; (V.V.); (G.L.); (A.C.)
| | - Aniello Costantini
- Department of Chemical, Materials and Production Engineering, University of Naples “Federico II”, p.le V. Tecchio 80, 80125 Naples, Italy; (V.V.); (G.L.); (A.C.)
| |
Collapse
|
230
|
Wu B, Xu P, Yang W, Hoch M, Dong W, Chen M, Bai H, Ma P. Super‐Toughened Heat‐Resistant Poly(lactic acid) Alloys By Tailoring the Phase Morphology and the Crystallization Behaviors. JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1002/pol.20190090] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Baogou Wu
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of EducationJiangnan University, 1800 Lihu Road Wuxi 214122 China
| | - Pengwu Xu
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of EducationJiangnan University, 1800 Lihu Road Wuxi 214122 China
| | - Weijun Yang
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of EducationJiangnan University, 1800 Lihu Road Wuxi 214122 China
| | - Martin Hoch
- Arlanxeo High Performance Elastomers (Shanghai Branch), 150 Hubin Road Shanghai 200021 China
| | - Weifu Dong
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of EducationJiangnan University, 1800 Lihu Road Wuxi 214122 China
| | - Mingqing Chen
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of EducationJiangnan University, 1800 Lihu Road Wuxi 214122 China
| | - Huiyu Bai
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of EducationJiangnan University, 1800 Lihu Road Wuxi 214122 China
| | - Piming Ma
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of EducationJiangnan University, 1800 Lihu Road Wuxi 214122 China
| |
Collapse
|
231
|
Backes EH, Pires LDN, Beatrice CAG, Costa LC, Passador FR, Pessan LA. Fabrication of Biocompatible Composites of Poly(lactic acid)/Hydroxyapatite Envisioning Medical Applications. POLYM ENG SCI 2020. [DOI: 10.1002/pen.25322] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Eduardo Henrique Backes
- Graduate Program in Materials Science and EngineeringFederal University of São Carlos 13565‐905 São Carlos SP Brazil
| | - Laís De Nóbile Pires
- Materials Engineering DepartmentFederal University of São Carlos 13565‐905 São Carlos SP Brazil
| | | | - Lidiane Cristina Costa
- Materials Engineering DepartmentFederal University of São Carlos 13565‐905 São Carlos SP Brazil
| | - Fabio Roberto Passador
- Science and Technology InstituteFederal University of São Paulo 12231‐280 São José dos Campos SP Brazil
| | - Luiz Antonio Pessan
- Materials Engineering DepartmentFederal University of São Carlos 13565‐905 São Carlos SP Brazil
| |
Collapse
|
232
|
Synthesis, crystallization behavior and mechanical properties of novel biobased Poly(octamethylene succinate). Polym Degrad Stab 2020. [DOI: 10.1016/j.polymdegradstab.2019.109043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
233
|
Ding S, Fang C, Wang X, Wang Z. Crystallization-driven microstructure changes during microphase separation for environment-friendly thermoplastic triblock copolymer elastomers. POLYMER 2020. [DOI: 10.1016/j.polymer.2019.121993] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
234
|
Yan C, Jiang YP, Hou DF, Yang W, Yang MB. High-efficient crystallization promotion and melt reinforcement effect of diblock PDLA-b-PLLA copolymer on PLLA. POLYMER 2020. [DOI: 10.1016/j.polymer.2019.122021] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
235
|
Klonos PA, Kluge M, Robert T, Kyritsis A, Bikiaris DN. Molecular dynamics, crystallization and hydration study of Poly(Propylene succinate) based Poly(Ester amide)s. POLYMER 2020. [DOI: 10.1016/j.polymer.2019.122056] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
236
|
Kruglikov A, Vasilchenko A, Kasprzhitskii A, Lazorenko G. Atomic-level understanding of interface interactions in a halloysite nanotubes-PLA nanocomposite. RSC Adv 2019; 9:39505-39514. [PMID: 35540670 PMCID: PMC9076096 DOI: 10.1039/c9ra08772a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 11/25/2019] [Indexed: 01/01/2023] Open
Abstract
To understand the nature of the bonding mechanism between poly(lactic acid) (PLA) and halloysite nanotubes (HNT), a first-principles DFT study was performed on the adsorption behavior of the PLA monomer, lactic acid (LA), on the outer, inner, and edge surfaces of the HNT. The role of LA functional groups, and its orientation behavior in the formation of bonds with HNT are systematically studied. Analysis of the adsorption energy, total and partial electron density of states (DOS), electric charge transfer between LA atoms and HNT mineral surfaces shows that van der Waals attraction governs their interaction. The calculations of the most stable adsorption configurations of LA show that the predominant number of hydrogen bonds is determined by the activity of the carboxyl functional group of LA on the hydroxylated surfaces of HNT. The important role of the –OH surface groups in the mechanism of lactic acid binding has been established; their absence on the external siloxane surface significantly reduces the LA affinity for HNT. The binding energy of lactic acid on the hydroxylated internal and edge surfaces of the HNT is much higher (by about 275%) than on the external siloxane surface. Mulliken population analysis showed that the formation of a hydrogen bond with the LA atomic groups leads to a more significant redistribution of charge on the inner and edge surfaces of the HNT in comparison with its outer surface. Van der Waals attraction between the LA and HNTs, as well as hydrogen bonds, is responsible for the formation of the bonding mechanism in halloysite nanotubes-PLA nanocomposite. Our results are in accord with available literature. The mechanism of bond formation between PLA and outer, inner and edge surfaces of HNT was established.![]()
Collapse
Affiliation(s)
- Alexander Kruglikov
- Rostov State Transport University Narodnogo Opolcheniya Sq. Rostov-on-Don 344038 Russia
| | - Andrey Vasilchenko
- Rostov State Transport University Narodnogo Opolcheniya Sq. Rostov-on-Don 344038 Russia
| | - Anton Kasprzhitskii
- Rostov State Transport University Narodnogo Opolcheniya Sq. Rostov-on-Don 344038 Russia .,Mineralica Limited Liability Company, Skolkovo Innovation Center 42 Bolshoy Boulevard Moscow 121205 Russia
| | - Georgy Lazorenko
- Rostov State Transport University Narodnogo Opolcheniya Sq. Rostov-on-Don 344038 Russia .,Mineralica Limited Liability Company, Skolkovo Innovation Center 42 Bolshoy Boulevard Moscow 121205 Russia
| |
Collapse
|
237
|
Arif U, Haider S, Haider A, Khan N, Alghyamah AA, Jamila N, Khan MI, Almasry WA, Kang IK. Biocompatible Polymers and their Potential Biomedical Applications: A Review. Curr Pharm Des 2019; 25:3608-3619. [DOI: 10.2174/1381612825999191011105148] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Accepted: 09/29/2019] [Indexed: 01/28/2023]
Abstract
Background:
Biocompatible polymers are gaining great interest in the field of biomedical applications.
The term biocompatibility refers to the suitability of a polymer to body and body fluids exposure. Biocompatible
polymers are both synthetic (man-made) and natural and aid in the close vicinity of a living system or work in
intimacy with living cells. These are used to gauge, treat, boost, or substitute any tissue, organ or function of the
body. A biocompatible polymer improves body functions without altering its normal functioning and triggering
allergies or other side effects. It encompasses advances in tissue culture, tissue scaffolds, implantation, artificial
grafts, wound fabrication, controlled drug delivery, bone filler material, etc.
Objectives:
This review provides an insight into the remarkable contribution made by some well-known biopolymers
such as polylactic-co-glycolic acid, poly(ε-caprolactone) (PCL), polyLactic Acid, poly(3-
hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), Chitosan and Cellulose in the therapeutic measure for many
biomedical applications.
Methods: :
Various techniques and methods have made biopolymers more significant in the biomedical fields such
as augmentation (replaced petroleum based polymers), film processing, injection modeling, blow molding techniques,
controlled / implantable drug delivery devices, biological grafting, nano technology, tissue engineering
etc.
Results:
The fore mentioned techniques and other advanced techniques have resulted in improved biocompatibility,
nontoxicity, renewability, mild processing conditions, health condition, reduced immunological reactions and
minimized side effects that would occur if synthetic polymers are used in a host cell.
Conclusion:
Biopolymers have brought effective and attainable targets in pharmaceutics and therapeutics. There
are huge numbers of biopolymers reported in the literature that has been used effectively and extensively.
Collapse
Affiliation(s)
- Uzma Arif
- Department of Chemistry, Kohat University of Science and Technology, Kohat, KPK, Pakistan
| | - Sajjad Haider
- Department of Chemical Engineering, College of Engineering, King Saud University, Riyadh, Saudi Arabia
| | - Adnan Haider
- Department of Chemistry, Kohat University of Science and Technology, Kohat, KPK, Pakistan
| | - Naeem Khan
- Department of Chemistry, Kohat University of Science and Technology, Kohat, KPK, Pakistan
| | - Abdulaziz A. Alghyamah
- Department of Chemical Engineering, College of Engineering, King Saud University, Riyadh, Saudi Arabia
| | - Nargis Jamila
- Department of Chemistry, Shaheed Benazir Bhutto Women University, Peshawar, KPK, Pakistan
| | - Muhammad Imran Khan
- Deparment of Pharmacy, Kohat University of Science and Technology, Kohat KPK, Pakistan
| | - Waheed A. Almasry
- Department of Chemical Engineering, College of Engineering, King Saud University, Riyadh, Saudi Arabia
| | - Inn-Kyu Kang
- Department of Polymer Science and Engineering, Kyungpook National University, Daegu, South Korea
| |
Collapse
|
238
|
Kaseem M, Hamad K, Ur Rehman Z. Review of Recent Advances in Polylactic Acid/TiO 2 Composites. MATERIALS (BASEL, SWITZERLAND) 2019; 12:E3659. [PMID: 31703262 PMCID: PMC6888381 DOI: 10.3390/ma12223659] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 11/05/2019] [Accepted: 11/06/2019] [Indexed: 01/28/2023]
Abstract
Polylactic acid/titanium oxide (PLA/TiO2) composites as multifunctional materials have been studied extensively by couple of research groups owing to their outstanding mechanical, thermal, photocatalytic, and antimicrobial properties. This review describes the experimental approaches used to improve the compatibility of PLA/TiO2 composites. The mechanical, thermal, photocatalytic, and antimicrobial properties of PLA/TiO2 composites are discussed. The potential applications arising from the structural and functional properties of PLA/TiO2 composites were also reviewed. Finally, it is concluded that a deep understanding of the impacts of TiO2 filler with available improvement approaches in the dispersibility of this filler in the PLA matrix would be the key for the effective usage of PLA/TiO2 composites and to expand their suitability with worldwide application requirements.
Collapse
Affiliation(s)
- Mosab Kaseem
- Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 05006, Korea
| | - Kotiba Hamad
- School of Advanced Materials Science & Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Korea;
| | - Zeeshan Ur Rehman
- Department of Materials Science and Engineering, Hongik University, Sejong, Jochiwon, Sejong-ro 2639, Korea;
| |
Collapse
|
239
|
Takkalkar P, Tobin MJ, Vongsvivut J, Mukherjee T, Nizamuddin S, Griffin G, Kao N. Structural, thermal, rheological and optical properties of poly(lactic acid) films prepared through solvent casting and melt processing techniques. J Taiwan Inst Chem Eng 2019. [DOI: 10.1016/j.jtice.2019.08.018] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
240
|
Munyazesa FX, Zhang Y, Wang B, Wang C, Feng X, Mao Z, Chen Y, Sui X. Pickering emulsion process assisted construction of regenerated chitin reinforced poly (lactic acid) blends. Int J Biol Macromol 2019; 140:10-16. [DOI: 10.1016/j.ijbiomac.2019.08.117] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 08/08/2019] [Accepted: 08/10/2019] [Indexed: 11/28/2022]
|
241
|
Poly(Lactic Acid) Composites. MATERIALS 2019; 12:ma12213586. [PMID: 31683618 PMCID: PMC6862024 DOI: 10.3390/ma12213586] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 10/18/2019] [Accepted: 10/30/2019] [Indexed: 12/02/2022]
Abstract
Polylactic acid-based materials have gained great interest within the scientific community due to their biodegradability, good performance, and suitability for a number of applications. Therefore, this Special Issue “Poly(lactic acid) Composites” is proposed to cover the important advances in poly (lactic acid) composites, ranging from their design, fabrication, and material properties to the potential applications of these materials. Therefore, we believe that the present Issue can convey beneficial information to scientists and engineers in numerous fields, including polymer science and biomedical engineering.
Collapse
|
242
|
Gan PG, Sam ST, Abdullah MFB, Omar MF. Thermal properties of nanocellulose‐reinforced composites: A review. J Appl Polym Sci 2019. [DOI: 10.1002/app.48544] [Citation(s) in RCA: 85] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- P. G. Gan
- School of Bioprocess EngineeringUniversiti Malaysia Perlis (UniMAP) 02600 Kompleks Pusat Pengajian Jejawi 3 Arau Perlis
| | - S. T. Sam
- School of Bioprocess EngineeringUniversiti Malaysia Perlis (UniMAP) 02600 Kompleks Pusat Pengajian Jejawi 3 Arau Perlis
| | - Muhammad Faiq bin Abdullah
- School of Bioprocess EngineeringUniversiti Malaysia Perlis (UniMAP) 02600 Kompleks Pusat Pengajian Jejawi 3 Arau Perlis
| | - Mohd Firdaus Omar
- School of Material EngineeringUniversiti Malaysia Perlis (UniMAP) 02600 Kompleks Pusat Pengajian Jejawi 2 Arau Perlis
| |
Collapse
|
243
|
Crystallization kinetics as a sensitive tool to detect degradation in poly(lactide)/poly(ε-caprolactone)/ PCL-co-PC copolymers blends. Polym Degrad Stab 2019. [DOI: 10.1016/j.polymdegradstab.2019.108939] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
244
|
Ren Y, Cui X, Wang L, Wang Y, Han L, Zhou Q, Song X. A new x-shaped copolymer role in poly(L-lactide) shape memory. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.07.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
245
|
Quantitively Characterizing the Chemical Composition of Tailored Bagasse Fiber and Its Effect on the Thermal and Mechanical Properties of Polylactic Acid-Based Composites. Polymers (Basel) 2019; 11:polym11101567. [PMID: 31561571 PMCID: PMC6836178 DOI: 10.3390/polym11101567] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 09/16/2019] [Accepted: 09/23/2019] [Indexed: 01/15/2023] Open
Abstract
Natural fiber reinforced polymer-based composites have been growing into a type of green composites. The properties of natural fiber reinforced polymer-based composites are closely related to the structure of natural fibers. Bagasse fiber (BF) is one of the most used natural fibers for preparing natural fiber reinforced polymer-based composites. However, few examples of previous research touch on the quantitatively characterization of structure of BF and its effect on the properties of BF reinforced polymer-based composites. In this work, four kinds of BF including untreated BF (UBF), alkali treated BF (ABF), BF modified by silane coupling agent (SBF), and BF modified combining alkali treatment with silane coupling agent (ASBF) were prepared and melting blended with polylactic acid (PLA) to prepare PLA/BF composites. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), thermogravimetry (TGA) and mechanical properties testing were used to characterize and analyze the structure and properties of modified BF and its reinforced PLA-based composites. Results showed that the used methods changed the structure of BF and their bonding modes. The surface energies of UBF, ABF, SBF, and ASBF were 19.8 mJ/m2, 34.7 mJ/m2, 12.3 mJ/m2, and 21.6 mJ/m2, respectively. The O/C ratios of UBF, ABF, SBF and, ASBF are 0.48, 0.53, 0.47, and 0.51. Due to the synergistic effect of alkali treatment and silane coupling agent modification on the surface chemical properties, the content of silicon elements on the surface of ASBF (4.15%) was higher than that of ASBF (2.38%). However, due to the destroying of alkali treatment on the microstructure of BF, the alkali treatment had no prominently synergetic effect with coupling agent modification on the mechanical properties of PLA/BF composites. Alkali treatment removed the small molecular compounds from BF, decreased its thermal stability, and increased the crystalline region and crystallinity of cellulose. Meanwhile, alkali treatment made BF fibrillated and increased its contactable active area with the coupling agents, but destructed the nature structure of BF. The silane coupling agent played a more important role than alkali treatment did in improving the interfacial compatibility of PLA/BF composites.
Collapse
|
246
|
Mahmoodi A, Ghodrati S, Khorasani M. High-Strength, Low-Permeable, and Light-Protective Nanocomposite Films Based on a Hybrid Nanopigment and Biodegradable PLA for Food Packaging Applications. ACS OMEGA 2019; 4:14947-14954. [PMID: 31552335 PMCID: PMC6751698 DOI: 10.1021/acsomega.9b01731] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Accepted: 08/19/2019] [Indexed: 06/10/2023]
Abstract
Herein, a multifunctional filler, a dye (organic)-clay (inorganic) hybrid nanopigment (DCNP), was embedded into polylactic acid (PLA) to fabricate a colored biodegradable/biocompatible film, which is explored as a high thermomechanical resistant as well as a superior light and mass transport barrier for food packaging applications. In this respect, the DCNP was synthesized through a wet chemical process with a reaction yield of 76% and incorporated into a PLA matrix at various concentrations using a solution casting method. The morphological characterizations revealed partially intercalated/exfoliated structure for PLA-DCNP films. The samples filled with DCNP showed up to 20% and 12 °C improvements in storage modulus (E') and glass transition temperature (T g), respectively, compared to those with neat PLA. Incorporation of a small amount of DCNP into the PLA matrix significantly declined the water vapor and gas permeability of PLA by 36 and 54%, respectively. The optical property investigations indicated remarkable color characteristics and light protection performance of the samples containing DCNP. The results also showed better performance of the PLA-DCNP film compared to that of the PLA-Cloisite 20A sample at an identical filler loading. In conclusion, the desirable properties of the resulting films highlighted the potential application of such nanocomposite films as a promising option for food packaging materials.
Collapse
Affiliation(s)
- Ali Mahmoodi
- Department of Polymer Engineering
and Color Technology, Amirkabir University
of Technology, P.O. Box 15875-4413, 1591634311 Tehran, Iran
| | - Sajjad Ghodrati
- Department of Polymer Engineering
and Color Technology, Amirkabir University
of Technology, P.O. Box 15875-4413, 1591634311 Tehran, Iran
| | - Manouchehr Khorasani
- Department of Polymer Engineering
and Color Technology, Amirkabir University
of Technology, P.O. Box 15875-4413, 1591634311 Tehran, Iran
| |
Collapse
|
247
|
Wen H, Wang Y, Wang D, Claville Christiansen J, Yu D, Jiang S, Chen C. Evaluation of Relationship Between Crystallization Structure and Thermal‐Mechanical Performance of PLA with MCC Addition. ChemistrySelect 2019. [DOI: 10.1002/slct.201902015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Huiying Wen
- College of ChemistryChemical Engineering and Resource UtilizationNortheast Forestry University Harbin 150040 China
| | - Yali Wang
- College of ChemistryChemical Engineering and Resource UtilizationNortheast Forestry University Harbin 150040 China
| | - Di Wang
- College of ChemistryChemical Engineering and Resource UtilizationNortheast Forestry University Harbin 150040 China
| | | | - Donghong Yu
- Department of Biotechnology, Chemistry, and Environmental EngineeringAalborg University DK-9220 Aalborg Denmark
| | - Shichun Jiang
- School of Materials Science and EngineeringTianjin University Tianjin 300072, China
| | - Chunxia Chen
- College of ChemistryChemical Engineering and Resource UtilizationNortheast Forestry University Harbin 150040 China
| |
Collapse
|
248
|
Thermo-Mechanical Properties of PLA/Short Flax Fiber Biocomposites. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9183797] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In this work, biocomposites based on poly(lactic acid) (PLA) and short flax fibers (10–40 wt.%) were produced by extrusion and characterized in terms of thermal, mechanical, morphological, and thermo-mechanical properties. Analytical models were adopted to predict the tensile properties (stress at break and elastic modulus) of the composites, and to assess the matrix/fiber interface adhesion. The resulting composites were easily processable by extrusion and injection molding up to 40 wt.% of flax fibers. It was observed that despite any superficial treatment of fibers, the matrix/fiber adhesion was found to be sufficiently strong to ensure an efficient load transfer between the two components obtaining composites with good mechanical properties. The best mechanical performance, in terms of break stress (66 MPa), was obtained with 20 wt.% of flax fibers. The flax fiber acted also as nucleating agent for PLA, leading to an increment of the composite stiffness and, at 40 wt.% of flax fibers, improving the elastic modulus decay near the PLA glass transition temperature.
Collapse
|
249
|
Characterization of Natural Composites Fabricated from Abutilon-Fiber-Reinforced Poly (Lactic Acid). Processes (Basel) 2019. [DOI: 10.3390/pr7090583] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
In recent decades, natural-fiber-reinforced poly (lactic acid) (PLA) composites have received a great deal of attention. In this study, biocomposites of poly (lactic acid) and abutilon fibers are prepared by using melt blending and an extruder. The effects of fiber additions on rheological, thermomechanical, thermal, and morphological properties are investigated using a rheometer, dynamic mechanical analysis (DMA), differential scanning calorimeter (DSC), TGA, and SEM, respectively. The DSC results indicate that the fibers acted as a nucleating agent, which led to enhancing the crystallization of PLA. The results also reveal that the thermal stability of PLA was improved by abutilon fibers. Moreover, higher values of storage modulus are observed, which are attributed to strong interfacial adhesion. In addition, thetan delta isreduced upon the addition of fiber content into the PLA matrix, which restricts the mobility of PLA polymer molecules in the presence of the fibers. The improvement of the properties and energy absorption capabilities of such biocomposites signifies the great potential of abutilon fibers as reinforcement in green composites.
Collapse
|
250
|
Polylactide cellulose-based nanocomposites. Int J Biol Macromol 2019; 137:912-938. [DOI: 10.1016/j.ijbiomac.2019.06.205] [Citation(s) in RCA: 76] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 06/19/2019] [Accepted: 06/26/2019] [Indexed: 11/17/2022]
|