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Song J, Chen Y, Chen Z. Hierarchical Porous Reduced Graphene Oxide/Poly(l-lactic acid) Fiber Films: The Influence of Recrystallization on Strength. ACS OMEGA 2024; 9:27358-27368. [PMID: 38947839 PMCID: PMC11209683 DOI: 10.1021/acsomega.4c01976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Revised: 05/31/2024] [Accepted: 06/04/2024] [Indexed: 07/02/2024]
Abstract
Electrospinning technology for fabricating nanofiber films and the Hummer method for synthesizing graphene oxide (GO), along with subsequent reduction, have been significantly advanced, demonstrating immense potential for large-scale industrial applications. Nanofibrous films loaded with reduced graphene oxide (rGO) have been widely explored for their applications in electromagnetic shielding, the biomedical fields, and pollutant adsorption. However, fragile mechanical performance of electrospun fibers with limited surface post-treatment methods has somewhat hindered their further industrial development. In response to this challenge, we propose a dual-regulation strategy involving post-treatment to form porous nanofiber films and the controlled flake size of rGO for surface coating during preparation. This approach aims to achieve poly(l-lactic acid) (PLLA)/rGO electrospun fibrous films with enhanced mechanical properties. It offers a roadmap for the continued application and standardized production of fibrous films loaded with rGO.
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Affiliation(s)
- Jun Song
- Materdicine
Lab, School of Life Sciences, Shanghai University, Shanghai 200444, P.R. China
| | - Yilu Chen
- Department
of Materials, The University of Manchester, Manchester M13 9PL, U.K.
| | - Zhongda Chen
- School
of Biomedical Engineering and Informatics, Nanjing Medical University, Nanjing 211166, P.R. China
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2
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Petrovics N, Kirchkeszner C, Patkó A, Tábi T, Magyar N, Kovácsné Székely I, Szabó BS, Nyiri Z, Eke Z. Effect of crystallinity on the migration of plastic additives from polylactic acid-based food contact plastics. Food Packag Shelf Life 2023. [DOI: 10.1016/j.fpsl.2023.101054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2023]
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3
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Zhu Z, Bian Y, Zhang X, Zeng R, Yang B. Study on the crystallization behavior and conformation adjustment scale of poly(lactic acid) in the terahertz frequency range. Phys Chem Chem Phys 2023; 25:8472-8481. [PMID: 36883295 DOI: 10.1039/d3cp00208j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
Abstract
The observed properties of crystalline polymers are determined by their internal structure, which in turn is the result of their different crystallization behaviors. Here, we investigate the crystallization behavior of poly(lactic acid) (PLA) by terahertz time-domain spectroscopy (THz-TDS) at varied temperatures. We find that the changes in the chain packing and conformation of PLA are characterized by THz spectroscopy. Combining X-ray diffraction (XRD) and infrared spectroscopy (IR), we attributed the blue-shift of the THz peak to the tightness of the chain packing, while its absorption enhancement is caused by the conformation transition. The effects of chain packing and chain conformation on the characteristic peak are phased. Furthermore, absorption discontinuities of the characteristic peaks of PLA crystallized at different temperatures are observed, which originated from differences in the degree of conformational transition caused by different thermal energies. We find that the crystallization temperature at which the absorption mutation of PLA occurs corresponds to the temperature at which the motion of the segment and molecular chain is excited, respectively. At these two temperatures, PLA exhibits different scales of conformational transitions leading to stronger absorption and larger absorption changes at higher crystallization temperatures. The results demonstrate that the driving force of PLA crystallization is indeed from changes in chain packing and chain conformation, and the molecular motion scale can also be characterized by THz spectroscopy.
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Affiliation(s)
- Zhenqi Zhu
- College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, 310018, P. R. China.
| | - Yujing Bian
- College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, 310018, P. R. China.
| | - Xun Zhang
- College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, 310018, P. R. China.
| | - Ruonan Zeng
- College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, 310018, P. R. China.
| | - Bin Yang
- College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou, 310018, P. R. China.
- Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, 310018, P. R. China
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4
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Heterogeneous porous PLLA/PCL fibrous scaffold for bone tissue regeneration. Int J Biol Macromol 2023; 235:123781. [PMID: 36849071 DOI: 10.1016/j.ijbiomac.2023.123781] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 02/09/2023] [Accepted: 02/16/2023] [Indexed: 02/27/2023]
Abstract
Bone tissue engineering has become one of the most promising therapeutic methods to treat bone defects. A suitable scaffolding material to regenerate new bone tissues should have a high specific surface area, high porosity and a suitable surface structure which benefit cell attachment, proliferation, and differentiation. In this study, an acetone post-treatment strategy was developed to generate heterogeneous structure. After PLLA/PCL nanofibrous membranes were electrospun and collected, they were treated with acetone to generate a highly porous structure. Meanwhile, part of PCL was extracted from the fibre and enriched on the fibre surface. The cell affinity of the nanofibrous membrane was verified by human osteoblast-like cells assay. The proliferation rate of heterogeneous samples increased 190.4 %, 265.5 % and 137.9 % at day 10 compared with pristine samples. These results demonstrated that the heterogeneous PLLA/PCL nanofibrous membranes could enhance osteoblast adhesion and proliferation. With high surface area (average surface area 36.302 m2/g) and good mechanical properties (average Young's modulus 1.65 GPa and average tensile strength 5.1 MPa), the heterogeneous PLLA/PCL membrane should have potential applications in the field of bone regeneration.
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5
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Aijaz MO, Yang SB, Karim MR, Alnaser IA, Alahmari AD, Almubaddel FS, Assaifan AK. Preparation and Characterization of Electrospun Poly(lactic acid)/Poly(ethylene glycol)- b-poly(propylene glycol)- b-poly(ethylene glycol)/Silicon Dioxide Nanofibrous Adsorbents for Selective Copper (II) Ions Removal from Wastewater. MEMBRANES 2023; 13:membranes13010054. [PMID: 36676861 PMCID: PMC9863775 DOI: 10.3390/membranes13010054] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 12/20/2022] [Accepted: 12/23/2022] [Indexed: 05/15/2023]
Abstract
The problem of industrial wastewater containing heavy metals is always a big concern, especially Cu2+, which interprets the soil activity in farmland and leaves a negative impact on the environment by damaging the health of animals. Various methods have been proposed as countermeasures against heavy-metal contaminations, and, as a part of this, an electrospun nanofibrous adsorption method for wastewater treatment is presented as an alternative. Poly(lactic acid) (PLA) is a biopolymer with an intrinsic hydrophobic property that has been considered one of the sustainable nanofibrous adsorbents for carrying adsorbate. Due to the hydrophobic nature of PLA, it is difficult to adsorb Cu2+ contained in wastewater. In this study, the hydrophilic PLA/poly(ethylene glycol)-poly(propylene glycol)-poly(ethylene glycol) (PEG-PPG-PEG) nanofibrous adsorbents with different silicon dioxide (SiO2) concentrations were successfully prepared by electrospinning. A hydrophilic group of PEG-PPG-PEG was imparted in PLA by the blending method. The prepared PLA/PEG-PPG-PEG/SiO2 nanofibrous adsorbents were analyzed with their morphological, contact angle analysis, and chemical structure. The Cu2+ adsorption capacities of the different PLA/PEG-PPG-PEG/SiO2 nanofibrous adsorbents were also investigated. The adsorption results indicated that the Cu2+ removal capacity of PLA/PEG-PPG-PEG/SiO2 nanofibrous adsorbents was higher than that of pure ones. Additionally, as an affinity nanofibrous adsorbent, its adsorption capacity was maintained after multiple recycling processes (desorption and re-adsorption). It is expected to be a promising nanofibrous adsorbents that will adsorb Cu2+ for wastewater treatment.
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Affiliation(s)
- Muhammad Omer Aijaz
- Department of Mechanical Engineering, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia
- Correspondence: (M.O.A.); (M.R.K.)
| | - Seong Baek Yang
- Department of Mechanical Engineering, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia
| | - Mohammad Rezaul Karim
- Department of Mechanical Engineering, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia
- Correspondence: (M.O.A.); (M.R.K.)
| | - Ibrahim Abdullah Alnaser
- Department of Mechanical Engineering, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia
| | | | - Fahad S. Almubaddel
- Department of Chemical Engineering, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia
| | - Abdulaziz K. Assaifan
- Department of Biomedical Technology, College of Applied Medical Sciences, King Saud University, Riyadh 11421, Saudi Arabia
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6
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Wu J, Chen X, Hu J, Yan S, Zhang J. Temperature-Dependent Polymorphism and Phase Transformation of Friction Transferred PLLA Thin Films. Polymers (Basel) 2022; 14:polym14235300. [PMID: 36501694 PMCID: PMC9741441 DOI: 10.3390/polym14235300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 11/23/2022] [Accepted: 11/24/2022] [Indexed: 12/12/2022] Open
Abstract
Poly(L-lactic acid) (PLLA) thin films with a highly oriented structure, successfully prepared by a fast friction transfer technique, were investigated mainly on the basis of synchrotron radiation wide-angle X-ray diffraction (WAXD) and Fourier transform infrared spectroscopy (FTIR). The crystalline structure of the highly oriented PLLA film was remarkably affected by friction transfer temperatures, which exhibited various crystal forms in different friction temperature regions. Interestingly, metastable β-form was generated at all friction transfer temperatures (70-140 °C) between Tg and Tm, indicating that fast friction transfer rate was propitious to the formation of β-form. Furthermore, the relative content among β-, α'-, and α-forms at different friction temperatures was estimated by WAXD as well as FTIR spectroscopy. In situ temperature-dependent WAXD was applied to reveal the complicated phase transition behavior of PLLA at a friction transfer temperature of 100 °C. The results illustrated that the contents of β- and α'-forms decreased in turn, whereas the α-form increased in content due to partially melt-recrystallization or crystal perfection. Moreover, by immersing into a solvent of acetone, β-, α'-form were transformed into stable α-crystalline form directly as a consequence. The highly oriented structure was maintained with the chain perfectly parallel to friction transfer direction after acetone treatment, evidenced by polarized FTIR and polarized optical microscopy (POM) measurements.
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Affiliation(s)
- Jinghua Wu
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao 266042, China
| | - Xing Chen
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao 266042, China
| | - Jian Hu
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao 266042, China
- Correspondence:
| | - Shouke Yan
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao 266042, China
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Jianming Zhang
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao 266042, China
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7
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Xiao D, Zheng MT, Wu FJ, Cao XX, Huang XF, Huang L, Xiao XQ. Fabrication of novel renewable furan-based phosphorus and its applications in poly (lactic acid): Thermal, flammability, crystallization and mechanical properties. Polym Degrad Stab 2022. [DOI: 10.1016/j.polymdegradstab.2022.110060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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8
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Zhang L, Narita C, Himeda Y, Honma H, Yamada K. Development of highly oil-absorbent polylactic-acid microfibers with a nanoporous structure via simple one-step centrifugal spinning. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.120156] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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9
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Lu Z, Zhang B, Gong H, Li J. Fabrication of hierarchical porous poly (l-lactide) (PLLA) fibrous membrane by electrospinning. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.123797] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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10
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Lu Z, Wang W, Zhang J, Bártolo P, Gong H, Li J. Electrospun highly porous poly(L-lactic acid)-dopamine-SiO2 fibrous membrane for bone regeneration. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 117:111359. [DOI: 10.1016/j.msec.2020.111359] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 07/15/2020] [Accepted: 08/04/2020] [Indexed: 02/08/2023]
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11
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12
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Zhu J, Tang D, Lu Z, Xin Z, Song J, Meng J, Lu JR, Li Z, Li J. Ultrafast bone-like apatite formation on highly porous poly(l-lactic acid)-hydroxyapatite fibres. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 116:111168. [PMID: 32806301 DOI: 10.1016/j.msec.2020.111168] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 05/27/2020] [Accepted: 06/05/2020] [Indexed: 12/13/2022]
Abstract
In order to provide a favourable environment for living bone formation, it is an essential condition to grow bone-like apatite layer at the interface between the tissue-implant and its surrounding tissues. Inspired by the chemical composition and the nano porous structure of natural bones, we developed an ultrafast and accessible route to accelerate effectively the formation of bone-like apatite on the surface of porous poly(l-lactic acid)-hydroxyapatite (PLLA-HA) composite fibres in 5 times simulated body fluid (5SBF). The key of the method lays in successful exposure of HA nanoparticles on the surface of PLLA fibres by acetone treatment of electrospun PLLA-HA nano/micro fibres. The recrystallization of PLLA chains uncovers more HA nanoparticles on the surface of every fibre which provide nucleation sites for calcium and phosphate ions. After only 2 h of immersing in 5SBF, a full layer of apatite completely covered on the surface of porous PLLA-HA fibres. The results indicate that HA nanoparticles on porous fibre surface can accelerate the kinetic deposition of apatite on fibre surface. Biological in vitro cell culture with human osteoblast-like cell for up to 7 days demonstrates that the incorporation of HA nanoparticles on the surface of porous PLLA fibrous membranes leads to significant enhance osteoblast adhesion and proliferation. The route can open avenues for development of fibrous PLLA biomaterials for hard tissue repair and substitution.
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Affiliation(s)
- Jing Zhu
- Department of Materials, The University of Manchester, Manchester M13 9PL, UK
| | - Dexin Tang
- Department of Materials, The University of Manchester, Manchester M13 9PL, UK
| | - Zihan Lu
- Department of Materials, The University of Manchester, Manchester M13 9PL, UK
| | - Zhiying Xin
- Department of Materials, The University of Manchester, Manchester M13 9PL, UK
| | - Jun Song
- Department of Materials, The University of Manchester, Manchester M13 9PL, UK
| | - Jinmin Meng
- Department of Materials, The University of Manchester, Manchester M13 9PL, UK
| | - Jian R Lu
- Department of Physics & Astronomy, The University of Manchester, Manchester, M13 9PL, UK
| | - Zhi Li
- College of Textile and Garment, Southwest University, Chongqing 400715, China
| | - Jiashen Li
- Department of Materials, The University of Manchester, Manchester M13 9PL, UK.
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13
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Atreya M, Dikshit K, Marinick G, Nielson J, Bruns C, Whiting GL. Poly(lactic acid)-Based Ink for Biodegradable Printed Electronics With Conductivity Enhanced through Solvent Aging. ACS APPLIED MATERIALS & INTERFACES 2020; 12:23494-23501. [PMID: 32326695 DOI: 10.1021/acsami.0c05196] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Biodegradable electronics is a rapidly growing field, and the development of controllably biodegradable, high-conductivity materials suitable for additive manufacturing under ambient conditions remains a challenge. In this report, printable conductive pastes that employ poly(lactic acid) (PLA) as a binder and tungsten as a conductor are demonstrated. These composite conductors can provide enhanced stability in applications where moisture may be present, such as environmental monitoring or agriculture. Post-processing the printed traces using a solvent-aging technique increases their conductivity by up to 2 orders of magnitude, with final conductivities approaching 5000 S/m. Such techniques could prove useful when thermal processes including heating or laser sintering are limited by the temperature constraints of typical biodegradable substrates. Both accelerated oxidative and hydrolytic degradation of the printed composite conductors are examined, and a fully biodegradable capacitive soil moisture sensor is fabricated and tested.
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Affiliation(s)
- Madhur Atreya
- Paul M. Rady Department of Mechanical Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Karan Dikshit
- Materials Science and Engineering Program, University of Colorado Boulder, Boulder, Colorado 80309 United States
| | - Gabrielle Marinick
- Paul M. Rady Department of Mechanical Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Jenna Nielson
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Carson Bruns
- Paul M. Rady Department of Mechanical Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Gregory L Whiting
- Paul M. Rady Department of Mechanical Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States
- Materials Science and Engineering Program, University of Colorado Boulder, Boulder, Colorado 80309 United States
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14
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Udayakumar M, Kollár M, Kristály F, Leskó M, Szabó T, Marossy K, Tasnádi I, Németh Z. Temperature and Time Dependence of the Solvent-Induced Crystallization of Poly( l-lactide). Polymers (Basel) 2020; 12:polym12051065. [PMID: 32384750 PMCID: PMC7284506 DOI: 10.3390/polym12051065] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 04/29/2020] [Accepted: 05/01/2020] [Indexed: 11/17/2022] Open
Abstract
The role of organic solvents in governing the crystallization and morphology of semi-crystalline poly-l-lactide (PLLA) sheets was systematically investigated. Three different organic solvents; ethyl acetate (EA), o-dichlorobenzene (ODCB), and nitrobenzene (NB), with a solubility parameter analogous to PLLA and with a high capability of swelling, were chosen. It has been witnessed that the degree of crystallization and crystal morphology depends highly on the degree of swelling and evaporation rate of the solvent. Besides, the temperature and time of treatment played a significant role in the crystallization of polymers. The effect of different solvents and curing times are reflected by the measured X-ray diffraction (XRD) peaks and the differences are best shown by the unit cell size. The largest variation is observed along the c-axis, indicating shorter bonds, thus, showing better conformation after NB and ODCB treatment. The percentage of crystallinity calculated using the classical relative crystallinity index of XRD shows closer values to those calculated with differential scanning calorimetry (DSC) data, but a huge variation is observed while using the LeBail deconvolution method. The strong birefringence of polarised optical micrograph (POM) and the crystal morphology of scanning electron micrograph (SEM) also evidenced the orientation of polymer crystallites and increased crystallinity after solvent-supported heat treatment.
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Affiliation(s)
- Mahitha Udayakumar
- Higher Education and Industry Cooperation Centre of Advanced Materials and Intelligent Technologies, University of Miskolc, H-3515 Miskolc, Hungary;
- Institute of Chemistry, University of Miskolc, H-3515 Miskolc, Hungary
| | - Mariann Kollár
- Institute of Ceramic and Polymer Engineering, University of Miskolc, H-3515 Miskolc, Hungary; (M.K.); (T.S.); (K.M.); (I.T.)
| | - Ferenc Kristály
- Institute of Mineralogy and Geology, University of Miskolc, H-3515 Miskolc, Hungary; (F.K.); (M.L.)
| | - Máté Leskó
- Institute of Mineralogy and Geology, University of Miskolc, H-3515 Miskolc, Hungary; (F.K.); (M.L.)
| | - Tamás Szabó
- Institute of Ceramic and Polymer Engineering, University of Miskolc, H-3515 Miskolc, Hungary; (M.K.); (T.S.); (K.M.); (I.T.)
| | - Kálmán Marossy
- Institute of Ceramic and Polymer Engineering, University of Miskolc, H-3515 Miskolc, Hungary; (M.K.); (T.S.); (K.M.); (I.T.)
| | - Ildikó Tasnádi
- Institute of Ceramic and Polymer Engineering, University of Miskolc, H-3515 Miskolc, Hungary; (M.K.); (T.S.); (K.M.); (I.T.)
| | - Zoltán Németh
- Higher Education and Industry Cooperation Centre of Advanced Materials and Intelligent Technologies, University of Miskolc, H-3515 Miskolc, Hungary;
- Institute of Chemistry, University of Miskolc, H-3515 Miskolc, Hungary
- Correspondence: ; Tel.: +36-46-565-111 (ext. 1380)
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15
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Zia Q, Tabassum M, Lu Z, Khawar MT, Song J, Gong H, Meng J, Li Z, Li J. Porous poly(L–lactic acid)/chitosan nanofibres for copper ion adsorption. Carbohydr Polym 2020; 227:115343. [DOI: 10.1016/j.carbpol.2019.115343] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 09/16/2019] [Accepted: 09/17/2019] [Indexed: 01/05/2023]
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16
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Knoch S, Chouinard G, Dumont MJ, Tavares JR. Dip-dip-dry: Solvent-induced tuning of polylactic acid surface properties. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.123591] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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17
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Morel A, Oberle SC, Ulrich S, Yazgan G, Spano F, Ferguson SJ, Fortunato G, Rossi RM. Revealing non-crystalline polymer superstructures within electrospun fibers through solvent-induced phase rearrangements. NANOSCALE 2019; 11:16788-16800. [PMID: 31465059 DOI: 10.1039/c9nr04432a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The design of nanofibers for biomedical applications requires a deep understanding of the fiber formation process and the resulting internal structure. In this regard, non-crystalline, mesomorphic structures play a central role in the processing of many polymers as precursors in the formation of crystalline superstructures (e.g. shish-kebab) and influence strongly the physical properties of polymers with a low degree of crystallinity. Yet, our ability to probe these relevant features is often greatly limited by their low contrast differences with the amorphous phase. We present an approach to reveal the organization of the mesomorphic superstructures within such polymeric materials, on the example of electrospun poly(l-lactide) nanofibers. Based on solvent-induced crystallization, this method employs fine-tuned solvent/non-solvent systems to enhance the contrast of these structural features by selectively triggering and controlling reorganization of the phases. Hereby, the mesomorphic regions are transformed into an α-crystalline phase, while the nanoscale spatial arrangement of the underlying superstructures is preserved. Combined with X-ray analytical techniques and electron microscopy, our approach provides detailed insights into the nanofiber's inner architecture, allowing for its direct visualization. Thereby, the influence of electrospinning parameters on the fiber formation process is explained as well as the impact of the resulting non-crystalline superstructures on single fiber mechanical properties. The method can be applied to comparable polymers for the development of materials with controlled, tailored properties.
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Affiliation(s)
- Alexandre Morel
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Biomimetic Membranes and Textiles, 9014 St Gallen, Switzerland.
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18
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Crystallization of poly(L-lactic acid)/poly(D-lactic acid) blend induced by organic solvents. Polym Bull (Berl) 2018. [DOI: 10.1007/s00289-018-2563-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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19
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20
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Shaiju P, Murthy NS, Gowd EB. Nonsolvent-induced morphological changes and nanoporosity in poly(l-lactide) films. SOFT MATTER 2018; 14:1492-1498. [PMID: 29404553 DOI: 10.1039/c8sm00041g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The role of a nonsolvent in controlling the crystallization and morphology of solvent-crystallized poly(l-lactide) (PLLA) films was investigated using various microscopy techniques and small- and wide-angle X-ray scattering (SAXS/WAXS). PLLA films crystallized in THF and acetone had 40-80 μm spherulites. When water was present in the solvent, a completely different morphology was observed with nanosized voids and the surfaces of the films were smooth. In contrast, SEM studies revealed that the films crystallized in acetone and THF which had macroporous structures, had larger voids and film surfaces were rough because of the presence of globular structures. Voids appeared within the spherulites in the THF/water treated film, whereas crystals nucleated at the surface of the nanosized voids in acetone/water treated PLLA films. The formation of such voids is attributed to the interface-enhanced crystal nucleation in a solvent/nonsolvent system where the nonsolvent increases the polymer crystal nucleation and the subsequent evaporation of the nonsolvent. The method described in this work can be extended to other polymers to control the morphologies of polymer films during solvent-induced crystallization.
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Affiliation(s)
- P Shaiju
- Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India.
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21
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Zhang N, Yu X, Duan J, Yang JH, Huang T, Qi XD, Wang Y. Comparison study of hydrolytic degradation behaviors between α′- and α-poly( l -lactide). Polym Degrad Stab 2018. [DOI: 10.1016/j.polymdegradstab.2017.12.014] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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22
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Castro AGB, Lo Giudice MC, Vermonden T, Leeuwenburgh SCG, Jansen JA, van den Beucken JJJP, Yang F. Top-Down Approach for the Preparation of Highly Porous PLLA Microcylinders. ACS Biomater Sci Eng 2016; 2:2099-2107. [DOI: 10.1021/acsbiomaterials.6b00522] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Antonio G. B. Castro
- Department of Biomaterials, Radboud University Medical Center, Philips van Leydenlaan 25, Nijmegen 6525 EX, The Netherlands
| | - Maria Cristina Lo Giudice
- Department of Biomaterials, Radboud University Medical Center, Philips van Leydenlaan 25, Nijmegen 6525 EX, The Netherlands
| | - Tina Vermonden
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical
Sciences (UIPS), Faculty of Science, Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands
| | - Sander C. G. Leeuwenburgh
- Department of Biomaterials, Radboud University Medical Center, Philips van Leydenlaan 25, Nijmegen 6525 EX, The Netherlands
| | - John A. Jansen
- Department of Biomaterials, Radboud University Medical Center, Philips van Leydenlaan 25, Nijmegen 6525 EX, The Netherlands
| | | | - Fang Yang
- Department of Biomaterials, Radboud University Medical Center, Philips van Leydenlaan 25, Nijmegen 6525 EX, The Netherlands
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23
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Tsai WC, Hedenqvist M, Laiback Å, Melin H, Ngo M, Trollsås M, Gedde U. Physical changes and sorption/desorption behaviour of amorphous and semi-crystalline PLLA exposed to water, methanol and ethanol. Eur Polym J 2016. [DOI: 10.1016/j.eurpolymj.2016.02.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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24
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Shaiju P, Murthy NS, Gowd EB. Molecular, Crystalline, and Lamellar Length-Scale Changes in the Poly(l-lactide) (PLLA) during Cyclopentanone (CPO) Desorption in PLLA/CPO Cocrystals. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b02425] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- P. Shaiju
- Materials
Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India
- Academy of Scientific
and Innovative Research (AcSIR), New Delhi 110 001, India
| | - N. Sanjeeva Murthy
- New
Jersey Center for Biomaterials, Rutgers University, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - E. Bhoje Gowd
- Materials
Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, Kerala, India
- Academy of Scientific
and Innovative Research (AcSIR), New Delhi 110 001, India
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25
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Gataullina KV, Ziganshin MA, Stoikov II, Gubaidullin AT, Gorbatchuk VV. Twice as smart behavior of tert-butylthiacalix[4]arene derivative in glassy and crystalline form. Phys Chem Chem Phys 2015; 17:15887-95. [PMID: 26017802 DOI: 10.1039/c5cp02042e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A studied tert-butylthiacalix[4]arene derivative with four N-(2-acetoxyethyl)carbamoylmethoxy substituents on its lower rim in partial-cone configuration (calixarene 1) can remember its previous treatment in three essentially different ways by the formation either of a molecular glass or two metastable polymorphs after heating or the removal of an included guest molecule. Guest-induced memory is very selective with a polymorph created only after the release of a few included guests among a large series of those studied and is detected via an exothermic transition. Along with ordinary properties, like glass transition, curing and cold crystallization, the molecular glass from 1 is selective due to its ability to crystallize in solvent vapors and vapor mixtures over a well-defined concentration range. Being cooperative, this property may be used for the visual detection of ethanol content in water solution when it reaches a threshold value.
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Affiliation(s)
- K V Gataullina
- A.M. Butlerov Institute of Chemistry, Kazan Federal University, Kremlevskaya 18, 420008 Kazan, Russia.
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26
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Wu N, Lang S, Zhang H, Ding M, Zhang J. Solvent-Induced Crystallization Behaviors of PLLA Ultrathin Films Investigated by RAIR Spectroscopy and AFM Measurements. J Phys Chem B 2014; 118:12652-9. [DOI: 10.1021/jp506840e] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Ningjing Wu
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao City 266042, People’s Republic of China
| | - Shuguo Lang
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao City 266042, People’s Republic of China
| | - Hong Zhang
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao City 266042, People’s Republic of China
| | - Meichun Ding
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao City 266042, People’s Republic of China
| | - Jianming Zhang
- Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao City 266042, People’s Republic of China
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27
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Guo SZ, Heuzey MC, Therriault D. Properties of polylactide inks for solvent-cast printing of three-dimensional freeform microstructures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:1142-1150. [PMID: 24410099 DOI: 10.1021/la4036425] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Solvent-cast printing is a highly versatile microfabrication technique that can be used to construct various geometries such as filaments, towers, scaffolds, and freeform circular spirals by the robotic deposition of a polymer solution ink onto a moving stage. In this work, we have performed a comprehensive characterization of the solvent-cast printing process using polylactide (PLA) solutions by analyzing the flow behavior of the solutions, the solvent evaporation kinetics, and the effect of process-related parameters on the crystallization of the extruded filaments. Rotational rheometry at low to moderate shear rates showed a nearly Newtonian behavior of the PLA solutions, while capillary flow analysis based on process-related data indicated shear thinning at high shear rates. Solvent vaporization tests suggested that the internal diffusion of the solvent through the filaments controlled the solvent removal of the extrudates. Different kinds of three-dimensional (3D) structures including a layer-by-layer tower, nine-layer scaffold, and freeform spiral were fabricated, and a processing map was given to show the proper ranges of process-related parameters (i.e., polymer content, applied pressure, nozzle diameter, and robot velocity) for the different geometries. The results of differential scanning calorimetry revealed that slow solvent evaporation could increase the ability of PLA to complete its crystallization process during the filament drying stage. The method developed here offers a new perspective for manufacturing complex structures from polymer solutions and provides guidelines to optimize the various parameters for 3D geometry fabrication.
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Affiliation(s)
- Shuang-Zhuang Guo
- Laboratory of Multiscale Mechanics, Mechanical Engineering Department Center for Applied Research on Polymers and composites (CREPEC), École Polytechnique de Montréal , C.P. 6079, succ. Centre-Ville, Montreal, QC H3C 3A7, Canada
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28
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Chen HM, Shen Y, Yang JH, Huang T, Zhang N, Wang Y, Zhou ZW. Molecular ordering and α′-form formation of poly(l-lactide) during the hydrolytic degradation. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.09.059] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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29
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Naga N, Yoshida Y, Noguchi K, Murase S. Crystallization of Amorphous Poly(Lactic Acid) Induced by Vapor of Acetone to Form High Crystallinity and Transparency Specimen. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/ojpchem.2013.32006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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30
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Gualandi C, Govoni M, Foroni L, Valente S, Bianchi M, Giordano E, Pasquinelli G, Biscarini F, Focarete ML. Ethanol disinfection affects physical properties and cell response of electrospun poly(l-lactic acid) scaffolds. Eur Polym J 2012. [DOI: 10.1016/j.eurpolymj.2012.09.016] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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31
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Widiastuti I, Sbarski I, Masood S. Creep behavior of PLA-based biodegradable plastic exposed to a hydrocarbon liquid. J Appl Polym Sci 2012. [DOI: 10.1002/app.37575] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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32
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Courgneau C, Domenek S, Lebossé R, Guinault A, Avérous L, Ducruet V. Effect of crystallization on barrier properties of formulated polylactide. POLYM INT 2011. [DOI: 10.1002/pi.3167] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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