1
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Dehghan-Toranposhti S, Bakhshi R, Alizadeh R, Bohlouli M. Fabrication, characterization and evaluating properties of 3D printed PLA-Mn scaffolds. Sci Rep 2024; 14:16592. [PMID: 39025973 PMCID: PMC11258323 DOI: 10.1038/s41598-024-67478-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Accepted: 07/11/2024] [Indexed: 07/20/2024] Open
Abstract
Polylactic acid (PLA) based scaffolds have attained considerable attention in recent years for being used as biodegradable implants in bone tissue engineering (BTE), owing to their suitable biocompatibility and processability. Nevertheless, the mechanical properties, bioactivity and biodegradation rate of PLA need to be improved for practical application. In this investigation, PLA-xMn composite filaments (x = 0, 1, 3, 5 and 7 wt%) were fabricated, characterized, and used for 3D printing of scaffolds by the fused deposition modeling process. The effect of Mn addition on the thermal, physical, mechanical, and structural properties, as well as the degradability and cell viability of 3D printed scaffolds were investigated in details. The obtained results indicate that the PLA-Mn composite filaments exhibit higher chain mobility and melt flow index values, with lower cold crystallization temperature and a higher degree of crystallinity. This higher flowability led to lower dimensional accuracy of 3D printed scaffolds, but resulted in higher interlayer adhesion. It was found that the mechanical properties of composite scaffolds were remarkably enhanced with the addition of Mn particles. The incorporation of Mn particles also caused higher surface roughness and hydrophilicity, a superior biodegradation rate of the scaffolds as well as better biocompatibility, indicating a promising candidate for (BTE) applications.
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Affiliation(s)
- Sina Dehghan-Toranposhti
- Department of Materials Science and Engineering, Sharif University of Technology, Azadi Ave., Tehran, 11155-9466, Iran
- Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, USA
| | - Rasoul Bakhshi
- Department of Materials Science and Engineering, Sharif University of Technology, Azadi Ave., Tehran, 11155-9466, Iran
| | - Reza Alizadeh
- Department of Materials Science and Engineering, Sharif University of Technology, Azadi Ave., Tehran, 11155-9466, Iran.
| | - Mahboubeh Bohlouli
- Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
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2
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Miętus M, Kolankowski K, Gołofit T, Denis P, Bandzerewicz A, Spychalski M, Mąkosa-Szczygieł M, Pilarek M, Wierzchowski K, Gadomska-Gajadhur A. From Poly(glycerol itaconate) Gels to Novel Nonwoven Materials for Biomedical Applications. Gels 2023; 9:788. [PMID: 37888360 PMCID: PMC10606113 DOI: 10.3390/gels9100788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 09/19/2023] [Accepted: 09/25/2023] [Indexed: 10/28/2023] Open
Abstract
Electrospinning is a process that has attracted significant interest in recent years. It provides the opportunity to produce nanofibers that mimic the extracellular matrix. As a result, it is possible to use the nonwovens as scaffolds characterized by high cellular adhesion. This work focused on the synthesis of poly(glycerol itaconate) (PGItc) and preparation of nonwovens based on PGItc gels and polylactide. PGItc gels were synthesized by a reaction between itaconic anhydride and glycerol. The use of a mixture of PGItc and PLA allowed us to obtain a material with different properties than with stand-alone polymers. In this study, we present the influence of the chosen ratios of polymers and the OH/COOH ratio in the synthesized PGItc on the properties of the obtained materials. The addition of PGItc results in hydrophilization of the nonwovens' surface without disrupting the high porosity of the fibrous structure. Spectral and thermal analyzes are presented, along with SEM imagining. The preliminary cytotoxicity research showed that nonwovens were non-cytotoxic materials. It also helped to pre-determine the potential application of PGItc + PLA nonwovens as subcutaneous tissue fillers or drug delivery systems.
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Affiliation(s)
- Magdalena Miętus
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3 Street, 00-664 Warsaw, Poland; (M.M.); (K.K.); (T.G.); (A.B.)
| | - Krzysztof Kolankowski
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3 Street, 00-664 Warsaw, Poland; (M.M.); (K.K.); (T.G.); (A.B.)
| | - Tomasz Gołofit
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3 Street, 00-664 Warsaw, Poland; (M.M.); (K.K.); (T.G.); (A.B.)
| | - Piotr Denis
- Laboratory of Polymers and Biomaterials, Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawińskiego 5B Street, 02-106 Warsaw, Poland;
| | - Aleksandra Bandzerewicz
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3 Street, 00-664 Warsaw, Poland; (M.M.); (K.K.); (T.G.); (A.B.)
| | - Maciej Spychalski
- Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141 Street, 02-507 Warsaw, Poland;
| | - Marcin Mąkosa-Szczygieł
- Department of Chemistry, Faculty of Natural Sciences, Norwegian University of Science and Technology, 7034 Trondheim, Norway;
| | - Maciej Pilarek
- Faculty of Chemical and Process Engineering, Warsaw University of Technology, Waryńskiego 1 Street, 00-645 Warsaw, Poland; (M.P.); (K.W.)
| | - Kamil Wierzchowski
- Faculty of Chemical and Process Engineering, Warsaw University of Technology, Waryńskiego 1 Street, 00-645 Warsaw, Poland; (M.P.); (K.W.)
| | - Agnieszka Gadomska-Gajadhur
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3 Street, 00-664 Warsaw, Poland; (M.M.); (K.K.); (T.G.); (A.B.)
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3
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Bergaliyeva S, Sales DL, Delgado FJ, Bolegenova S, Molina SI. Manufacture and Characterization of Polylactic Acid Filaments Recycled from Real Waste for 3D Printing. Polymers (Basel) 2023; 15:2165. [PMID: 37177311 PMCID: PMC10180583 DOI: 10.3390/polym15092165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 04/26/2023] [Accepted: 04/26/2023] [Indexed: 05/15/2023] Open
Abstract
This paper studies the thermal, morphological, and mechanical properties of 3D-printed polylactic acid (PLA) blends of virgin and recycled material in the following proportions: 100/0, 25/75, 50/50, and 75/25, respectively. Real waste, used as recycled content, was shredded and sorted by size without a washing step. Regular dog-bone specimens were 3D printed from filaments, manufactured in a single screw extruder. Thermogravimetric analysis indicated that adding PLA debris to raw material did not significantly impact the thermal stability of the 3D-printed samples and showed that virgin and recycled PLA degraded at almost the same temperature. Differential scanning calorimetry revealed a significant reduction in crystallinity with increasing recycled content. Scanning electron microscopy showed a more homogenous structure for specimens from 100% pure PLA, as well as a more heterogeneous one for PLA blends. The tensile strength of the PLA blends increased by adding more recycled material, from 44.20 ± 2.18 MPa for primary PLA to 52.61 ± 2.28 MPa for the blend with the highest secondary PLA content. However, this study suggests that the mechanical properties of the reprocessed parts and their basic association are unique compared with those made up of virgin material.
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Affiliation(s)
- Saltanat Bergaliyeva
- Department of Materials Science and Metallurgical Engineering and Inorganic Chemistry, Algeciras School of Engineering and Technology, Universidad de Cádiz, INNANOMAT, IMEYMAT, Ramón Puyol Ave, 11202 Algeciras, Cádiz, Spain;
- Physics and Technology Department, Al-Farabi Kazakh National University, 71, Al-Farabi Ave, Almaty 050040, Kazakhstan;
| | - David L. Sales
- Department of Materials Science and Metallurgical Engineering and Inorganic Chemistry, Algeciras School of Engineering and Technology, Universidad de Cádiz, INNANOMAT, IMEYMAT, Ramón Puyol Ave, 11202 Algeciras, Cádiz, Spain;
| | - Francisco J. Delgado
- Department of Materials Science and Metallurgical Engineering and Inorganic Chemistry, Universidad de Cádiz, Campus Río S. Pedro, INNANOMAT, IMEYMAT, 11510 Puerto Real, Cádiz, Spain; (F.J.D.); (S.I.M.)
| | - Saltanat Bolegenova
- Physics and Technology Department, Al-Farabi Kazakh National University, 71, Al-Farabi Ave, Almaty 050040, Kazakhstan;
| | - Sergio I. Molina
- Department of Materials Science and Metallurgical Engineering and Inorganic Chemistry, Universidad de Cádiz, Campus Río S. Pedro, INNANOMAT, IMEYMAT, 11510 Puerto Real, Cádiz, Spain; (F.J.D.); (S.I.M.)
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4
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Ring-expansion polymerization (REP) of L-lactide with cyclic tin catalysts – About formation of extended ring crystals and optimization of Tm and ΔHm. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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5
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Kovaleva PA, Pariy IO, Chernozem RV, Yu. Zadorozhnyy M, Permyakova ES, Kolesnikov EA, Surmeneva MA, Surmenev RA, Senatov FS. Shape memory effect in hybrid polylactide-based polymer scaffolds functionalized with reduced graphene oxide for tissue engineering. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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6
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Abstract
Reaction mechanisms and synthetic methods used for the preparation of homo- and copolylactides based on tin(ii) and tin(iv) catalysts are reviewed.
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Affiliation(s)
- Hans R. Kricheldorf
- Universität Hamburg, Institut für Technische und Makromolekulare Chemie, Bundesstr. 45, D-20146 Hamburg, Germany
| | - Steffen M. Weidner
- Bundesanstalt für Materialforschung und -prüfung – BAM, Richard Willstätter Str. 11, D-12489 Berlin, Germany
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7
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ROPs of l-lactide catalyzed by neat Tin(II)2-ethylhexanoate - Influence of the reaction conditions on Tm and ΔHm. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.124122] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Delpouve N, Faraj H, Demarest C, Dontzoff E, Garda MR, Delbreilh L, Berton B, Dargent E. Water-Induced Breaking of Interfacial Cohesiveness in a Poly(lactic acid)/Miscanthus Fibers Biocomposite. Polymers (Basel) 2021; 13:2285. [PMID: 34301040 PMCID: PMC8309251 DOI: 10.3390/polym13142285] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 07/09/2021] [Accepted: 07/09/2021] [Indexed: 11/16/2022] Open
Abstract
The impact of the immersion in water on the morphology and the thermomechanical properties of a biocomposite made of a matrix of poly (lactic acid) (PLA) modified with an ethylene acrylate toughening agent, and reinforced with miscanthus fibers, has been investigated. Whereas no evidence of hydrolytic degradation has been found, the mechanical properties of the biocomposite have been weakened by the immersion. Scanning electron microscopy (SEM) pictures reveal that the water-induced degradation is mainly driven by the cracking of the fiber/matrix interface, suggesting that the cohesiveness is a preponderant factor to consider for the control of the biocomposite decomposition in aqueous environments. Interestingly, it is observed that the loss of mechanical properties is aggravated when the stereoregularity of PLA is the highest, and when increasing the degree of crystallinity. To investigate the influence of the annealing on the matrix behavior, crystallization at various temperatures has been performed on tensile bars of PLA made by additive manufacturing with an incomplete filling to enhance the contact area between water and polymer. While a clear fragilization occurs in the material crystallized at high temperature, PLA crystallized at low temperature better maintains its properties and even shows high elongation at break likely due to the low size of the spherulites in these annealing conditions. These results show that the tailoring of the mesoscale organization in biopolymers and biocomposites can help control their property evolution and possibly their degradation in water.
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Affiliation(s)
- Nicolas Delpouve
- University of Rouen Normandie, INSA Rouen, CNRS, GPM, 76000 Rouen, France; (H.F.); (C.D.); (E.D.); (M.-R.G.); (L.D.); (B.B.); (E.D.)
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9
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Beltrán FR, Arrieta MP, Elena Antón D, Lozano-Pérez AA, Cenis JL, Gaspar G, de la Orden MU, Martínez Urreaga J. Effect of Yerba Mate and Silk Fibroin Nanoparticles on the Migration Properties in Ethanolic Food Simulants and Composting Disintegrability of Recycled PLA Nanocomposites. Polymers (Basel) 2021; 13:polym13121925. [PMID: 34200571 PMCID: PMC8230047 DOI: 10.3390/polym13121925] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2021] [Revised: 05/28/2021] [Accepted: 06/05/2021] [Indexed: 11/29/2022] Open
Abstract
The main objective of the present research is to study the effect of the incorporation of low amounts of silk fibroin nanoparticles (SFNs) and yerba mate nanoparticles (YMNs) on the migration phenomenon into ethanolic food simulants as well as on the disintegrability under composting conditions of mechanically recycled polylactic acid (PLA). Recycled PLA was obtained under simulated recycling conditions by melt processing virgin PLA into films and further subjecting them to an accelerated aging process, which involved photochemical, thermal, and hydrothermal aging steps followed by an intense washing step. SFNs were extracted from Bombyx mori cocoons and YMNs from yerba mate waste. Then, recycled PLA was melted, reprocessed, and reinforced with either 1%wt. of SFNs or YMNs, by melt extrusion, and further processed into films by compression molding. The obtained nanocomposites were exposed to ethanolic food simulants (ethanol 10% v/v, simulant A and ethanol 50% v/v, simulant D1) and the structural, thermal, and mechanical properties were studied before and after the exposure to the food simulants. The migration levels in both food simulants were below the overall migration limits required for food contact materials. The materials were disintegrated under simulated composting conditions at the laboratory scale level and it was observed that the nanoparticles delayed the disintegration rate of the recycled PLA matrix, but nanocomposites were fully disintegrated in less than one month.
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Affiliation(s)
- Freddys R. Beltrán
- Departamento de Ingeniería Química Industrial y Medio Ambiente, Universidad Politécnica de Madrid, E.T.S.I. Industriales, 28006 Madrid, Spain; (F.R.B.); (D.E.A.); (G.G.); (J.M.U.)
- Grupo de Investigación Polímeros Caracterización y Aplicaciones (POLCA), Madrid, Spain;
| | - Marina P. Arrieta
- Departamento de Ingeniería Química Industrial y Medio Ambiente, Universidad Politécnica de Madrid, E.T.S.I. Industriales, 28006 Madrid, Spain; (F.R.B.); (D.E.A.); (G.G.); (J.M.U.)
- Grupo de Investigación Polímeros Caracterización y Aplicaciones (POLCA), Madrid, Spain;
- Correspondence: ; Tel.: +34-910-677-301
| | - Diego Elena Antón
- Departamento de Ingeniería Química Industrial y Medio Ambiente, Universidad Politécnica de Madrid, E.T.S.I. Industriales, 28006 Madrid, Spain; (F.R.B.); (D.E.A.); (G.G.); (J.M.U.)
| | - Antonio A. Lozano-Pérez
- Depertamento de Biotecnología, Genómica y Mejora Vegetal, Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA), 30150 Murcia, Spain; (A.A.L.-P.); (J.L.C.)
| | - José L. Cenis
- Depertamento de Biotecnología, Genómica y Mejora Vegetal, Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA), 30150 Murcia, Spain; (A.A.L.-P.); (J.L.C.)
| | - Gerald Gaspar
- Departamento de Ingeniería Química Industrial y Medio Ambiente, Universidad Politécnica de Madrid, E.T.S.I. Industriales, 28006 Madrid, Spain; (F.R.B.); (D.E.A.); (G.G.); (J.M.U.)
- Grupo de Investigación Polímeros Caracterización y Aplicaciones (POLCA), Madrid, Spain;
| | - María U. de la Orden
- Grupo de Investigación Polímeros Caracterización y Aplicaciones (POLCA), Madrid, Spain;
- Deparamento de Química Orgánica, Facultad de Óptica y Optometría, Universidad Complutense de Madrid, 28037 Madrid, Spain
| | - Joaquín Martínez Urreaga
- Departamento de Ingeniería Química Industrial y Medio Ambiente, Universidad Politécnica de Madrid, E.T.S.I. Industriales, 28006 Madrid, Spain; (F.R.B.); (D.E.A.); (G.G.); (J.M.U.)
- Grupo de Investigación Polímeros Caracterización y Aplicaciones (POLCA), Madrid, Spain;
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10
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Weidner SM, Meyer A, Falkenhagen J, Kricheldorf HR. SnOct2-catalyzed and alcohol-initiated ROPs of L-lactide – About the influence of initiators on chemical reactions in the melt and the solid state. Eur Polym J 2021. [DOI: 10.1016/j.eurpolymj.2021.110508] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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11
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Beltrán FR, Gaspar G, Dadras Chomachayi M, Jalali-Arani A, Lozano-Pérez AA, Cenis JL, de la Orden MU, Pérez E, Martínez Urreaga JM. Influence of addition of organic fillers on the properties of mechanically recycled PLA. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:24291-24304. [PMID: 32043250 DOI: 10.1007/s11356-020-08025-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Accepted: 02/06/2020] [Indexed: 05/20/2023]
Abstract
Poly(lactic acid) (PLA) is one of the most used biobased and biodegradable polymers. Due to their high stability, some of the newest grades of PLA are only degradable under severe industrial conditions. For these grades, mechanical recycling is a viable end-of-life option, with great environmental advantages. However, the polymer undergoes degradation during its service life and in the melt reprocessing, which leads to a decrease in properties that can compromise the recyclability of PLA. The goal of this work was to evaluate the usefulness of adding small amounts of two organic fillers, chitosan, and silk fibroin nanoparticles, during the recycling process for improving the properties of the recycled plastic. The degradation level of the aged polymer and the nature and amount of filler affect the performance of the recycled plastics. The fillers reduce the degradation during the melt reprocessing of PLA previously subjected to severe hydrolysis, thus increasing the intrinsic viscosity of the recycled plastic. A careful selection of the added organic filler lead to recycled plastics with improvements in some key mechanical, thermal, and barrier properties. Thus, the use of organic fillers represents a cost-effective and environmentally sound way for improving the mechanical recycling of bioplastics.
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Affiliation(s)
- Freddys R Beltrán
- Dpto. Ingeniería Química Industrial y Medio Ambiente, Universidad Politécnica de Madrid, E.T.S.I. Industriales, 28006, Madrid, Spain
- Grupo de Investigación: Polímeros, Caracterización y Aplicaciones (POLCA, Associated Unit to CSIC), Madrid, Spain
| | - Gerald Gaspar
- Dpto. Ingeniería Química Industrial y Medio Ambiente, Universidad Politécnica de Madrid, E.T.S.I. Industriales, 28006, Madrid, Spain
| | | | - Azam Jalali-Arani
- Department of Polymer Engineering & Color Technology, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran
| | - Antonio A Lozano-Pérez
- Dpto. Biotecnología, Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA), 30150, Murcia, Spain
| | - José L Cenis
- Dpto. Biotecnología, Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA), 30150, Murcia, Spain
| | - María U de la Orden
- Grupo de Investigación: Polímeros, Caracterización y Aplicaciones (POLCA, Associated Unit to CSIC), Madrid, Spain
- Dpto. de Química Orgánica I, Facultad de Óptica y Optometría, Universidad Complutense de Madrid, 28037, Madrid, Spain
| | - Ernesto Pérez
- Instituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC, 28006, Madrid, Spain
| | - Joaquín M Martínez Urreaga
- Dpto. Ingeniería Química Industrial y Medio Ambiente, Universidad Politécnica de Madrid, E.T.S.I. Industriales, 28006, Madrid, Spain.
- Grupo de Investigación: Polímeros, Caracterización y Aplicaciones (POLCA, Associated Unit to CSIC), Madrid, Spain.
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12
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Kricheldorf HR, Weidner SM, Meyer A. High T m linear poly(l-lactide)s prepared via alcohol-initiated ROPs of l-lactide. RSC Adv 2021; 11:14093-14102. [PMID: 35423910 PMCID: PMC8697697 DOI: 10.1039/d1ra01990b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Accepted: 04/06/2021] [Indexed: 11/21/2022] Open
Abstract
Alcohol-initiated ROPs of l-lactide were performed in bulk at 160 °C for 72 h with variation of the catalyst or with variation of the initiator (aliphatic alcohols). Spontaneous crystallization was only observed when cyclic Sn(ii) compounds were used as a catalyst. Regardless of initiator, high melting crystallites with melting temperatures (T m) of 189-193 °C were obtained in almost all experiments with Sn(ii) 2,2'-dioxybiphenyl (SnBiph) as catalyst, even when the time was shortened to 24 h. These HTm poly(lactide)s represent the thermodynamically most stable form of poly(l-lactide). Regardless of the reaction conditions, such high melting crystallites were never obtained when Sn(ii) 2-ethylhexanoate (SnOct2) was used as catalyst. SAXS measurements evidenced that formation of HTm poly(l-lactide) involves growth of the crystallite thickness, but chemical modification of the crystallite surface (smoothing) seems to be of greater importance. A hypothesis, why the "surface smoothing" is more effective for crystallites of linear chains than for crystallites composed of cycles is discussed.
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Affiliation(s)
- Hans R Kricheldorf
- Institut für Technische und Makromolekulare Chemie der Universität Hamburg Bundesstr. 45 D-20146 Hamburg Germany
| | - Steffen M Weidner
- BAM, Bundesanstalt für Materialforschung und -prüfung Richard Willstätter Straße 11 12489 Berlin Germany
| | - Andreas Meyer
- Institut für Physikalische Chemie der Universität Hamburg Grindelallee 117 D-20147 Hamburg Germany
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13
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Oztemur J, Yalcin-Enis I. Development of biodegradable webs of PLA/PCL blends prepared via electrospinning: Morphological, chemical, and thermal characterization. J Biomed Mater Res B Appl Biomater 2021; 109:1844-1856. [PMID: 33847451 DOI: 10.1002/jbm.b.34846] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 03/23/2021] [Accepted: 03/31/2021] [Indexed: 01/02/2023]
Abstract
Biodegradable polymers have a mean role to mimic native tissues and allow cells to penetrate, grow, and proliferate with their advanced features in tissue engineering applications. The physiological, chemical, mechanical, and biological qualities of the surfaces, which are presented from biodegradable polymers, affect the final properties of the scaffolds. In this study, it is aimed to produce fibrous webs by electrospinning method for tissue engineering applications using two different biopolymers, polylactic acid (PLA) and polycaprolactone (PCL). These polymers are used either alone or in a blended form (PLA/PCL, 1/1 wt.). Within the scope of the study, polymer concentrations (6, 8 and 10%) and solvent types (used for chloroform/ethanol/acetic acid mixture, PCL and PLA/PCL mixtures, and chloroform/acetone, PLA) vary as solution parameters. Fibrous webs are investigated in terms of morphological, chemical, and thermal characteristics. Results show continuous fibers are examined for 8 or 10% polymer concentrations with an average fiber diameter of 1.3-2.7 μm and pore area of 4-9 μm2 . No fiber formation is observed in sample groups with a polymer concentration of 6% and beaded structures are formed. Water contact angle analysis proves the hydrophobic properties of PLA and PCL, whereas Fourier-transform infrared results show there is no solution residue on the surfaces, so there is no toxic effect. Also, in differential scanning calorimetry analysis, the characteristic crystallization peaks of the polymers are recognized, and when the polymers are in a blend, it beholds that they have effects on each other's crystallization.
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Affiliation(s)
- Janset Oztemur
- Textile Engineering Department, Istanbul Technical University, Istanbul, Turkey
| | - Ipek Yalcin-Enis
- Textile Engineering Department, Istanbul Technical University, Istanbul, Turkey
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14
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Weidner SM, Kricheldorf HR, Scheliga F. Ring‐Expansion Copolymerization of
l
‐Lactide and Glycolide. MACROMOL CHEM PHYS 2021. [DOI: 10.1002/macp.202000307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Steffen M. Weidner
- BAM, Federal Institute for Material Research and Testing Richard Willstätter Str. 11 Berlin D‐12489 Germany
| | - Hans R. Kricheldorf
- Institut für Technische und Makromolekulare Chemie Universität Hamburg Bundesstr. 45 Hamburg D‐20146 Germany
| | - Felix Scheliga
- Institut für Technische und Makromolekulare Chemie Universität Hamburg Bundesstr. 45 Hamburg D‐20146 Germany
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15
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Weidner SM, Meyer A, Chatti S, Kricheldorf HR. About the transformation of low T m into high T m poly(l-lactide)s by annealing under the influence of transesterification catalysts. RSC Adv 2021; 11:2872-2883. [PMID: 35424240 PMCID: PMC8693987 DOI: 10.1039/d0ra10012a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Accepted: 01/03/2021] [Indexed: 11/21/2022] Open
Abstract
Cyclic polylactides were prepared in bulk at 170 °C, crystallized at 120 °C and then annealed at temperatures between 130 and 170 °C with variation of catalyst, catalyst concentration and annealing time. The transformation of the initially formed low melting (LT m) crystallites, having melting temperatures (T m) < 180 °C into high melting (HT m) crystallites having T m values > 189 °C was monitored by means of DSC measurements and characterized in selected cases by SAXS measurements. It was confirmed that the formation of HT m crystallites involves a significant growth of the thickness of the lamellar crystallites along with smoothing of their surface. Annealing at 170 °C for 1 d or longer causes thermal degradation with lowering of the molecular weights, a gradual transition of cyclic into linear chains and a moderate decrease of lamellar thickness. An unexpected result revealed by MALDI TOF mass spectrometry is a partial reorganization of the molecular weight distribution driven by a gain of crystallization enthalpy.
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Affiliation(s)
- Steffen M Weidner
- BAM - Bundesanstalt für Materialforschung und -prüfung Richard Willstätter Str. 11 D-12489 Berlin Germany
| | - Andreas Meyer
- Institut für Physikalische Chemie, Universität Hamburg Grindelallee 117 D-20146 Hamburg Germany
| | - Saber Chatti
- Institute National de la Recherche et D'Analyse (INRAP) Sidi Thabet Tunisia
| | - Hans R Kricheldorf
- Institut für Technische und Makromolekulare Chemie, Universität Hamburg Bundesstr. 45 D-20146 Hamburg Germany
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16
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Poly(lactic acid) (PLA)/Poly(butylene succinate-co-adipate) (PBSA) Compatibilized Binary Biobased Blends: Melt Fluidity, Morphological, Thermo-Mechanical and Micromechanical Analysis. Polymers (Basel) 2021; 13:polym13020218. [PMID: 33435479 PMCID: PMC7827856 DOI: 10.3390/polym13020218] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2020] [Revised: 01/04/2021] [Accepted: 01/05/2021] [Indexed: 11/29/2022] Open
Abstract
In this work poly(lactic) acid (PLA)/poly(butylene succinate-co-adipate) (PBSA) biobased binary blends were investigated. PLA/PBSA mixtures with different compositions of PBSA (from 15 up to 40 wt.%) were produced by twin screw-extrusion. A first screening study was performed on these blends that were characterized from the melt fluidity, morphological and thermo-mechanical point of view. Starting from the obtained results, the effect of an epoxy oligomer (EO) (added at 2 wt.%) was further investigated. In this case a novel approach was introduced studying the micromechanical deformation processes by dilatometric uniaxial tensile tests, carried out with a videoextensometer. The characterization was then completed adopting the elasto-plastic fracture approach, by the measurement of the capability of the selected blends to absorb energy at a slow rate. The obtained results showed that EO acts as a good compatibilizer, improving the compatibility of the rubber phase into the PLA matrix. Dilatometric results showed different micromechanical responses for the 80–20 and 60–40 blends (probably linked to the different morphology). The 80–20 showed a cavitational behavior while the 60–40 a deviatoric one. It has been observed that while the addition of EO does not alter the micromechanical response of the 60–40 blend, it profoundly changes the response of the 80–20, that passed to a deviatoric behavior with the EO addition.
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17
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Staub MC, Li R, Fukuto M, Li CY. Confined Crystal Melting in Edgeless Poly(l-lactic acid) Crystalsomes. ACS Macro Lett 2020; 9:1773-1778. [PMID: 35653681 DOI: 10.1021/acsmacrolett.0c00693] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Polymer single crystals tend to be quasi two-dimensional (2D) lamellae and their small lateral surfaces are the starting points of lamella melting and thickening. However, the recently discovered crystalsomes, which are defined for hollow single crystal-like spherical shells, are edgeless, self-confined, and incommensurate with translational symmetry. This work concerns the structure and melting behavior of these edgeless crystalsomes. Poly(l-lactic acid) crystalsomes were grown using a miniemulsion solution crystallization method. Differential scanning calorimetry and in situ wide-angle X-ray diffraction were used to follow the structural evolution of the crystalsomes upon heating. Our results demonstrated that the structure and melting behavior of crystalsomes are curvature-dependent and significantly different from their flat crystal counterpart.
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Affiliation(s)
- Mark C. Staub
- Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Ruipeng Li
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Masafumi Fukuto
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Christopher Y. Li
- Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
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18
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Affiliation(s)
- Maria Laura Di Lorenzo
- Institute of Polymers, Composites and Biomaterials (IPCB), National Research Council (CNR), Pozzuoli, Italy
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19
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Demina TS, Kuryanova AS, Bikmulina PY, Aksenova NA, Efremov YM, Khaibullin ZI, Ivanov PL, Kosheleva NV, Timashev PS, Akopova TA. Multicomponent Non-Woven Fibrous Mats with Balanced Processing and Functional Properties. Polymers (Basel) 2020; 12:E1911. [PMID: 32854227 PMCID: PMC7563478 DOI: 10.3390/polym12091911] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 08/15/2020] [Accepted: 08/19/2020] [Indexed: 12/17/2022] Open
Abstract
The mimicking of the architectonics of native tissue, biodegradable non-woven fibrous mats is one of the most promising forms of scaffolding for tissue engineering. The key properties needed for their successful application in vivo, such as biodegradability, biocompatibility, morphology, mechanical properties, etc., rely on their composition and appropriate 3D structure. A multicomponent system based on biodegradable synthetic (polycaprolactone, oligo-/polylactide) and natural (chitosan, gelatin) polymers, providing the desired processing characteristics and functionality to non-woven mats fabricated via the electrospinning technique, was developed. The solid-state reactive blending of these components provided a one-step synthesis of amphiphilic graft copolymer with an ability to form stable ultra-fine dispersions in chlorinated solvents, which could be successfully used as casting solvents for the electrospinning technique. The synthesized graft copolymer was analyzed with the aim of fractional analysis, dynamic laser scattering, FTIR-spectroscopy and DSC. Casting solution characteristics, namely viscosity, surface tension, and electroconductivity, as well as electrospinning parameters, were studied and optimized. The morphology, chemical structure of the surface layer, mechanical properties and cytocompatibility were analyzed to confirm the appropriate functionality of the formed fibrous materials as scaffolds for tissue engineering.
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Affiliation(s)
- Tatiana S. Demina
- Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences (ISPM RAS), 70 Profsoyuznaya st., 117393 Moscow, Russia; (Z.I.K.); (P.L.I.); (T.A.A.)
- Institute for Regenerative Medicine, Sechenov University, 8-2 Trubetskaya st., 119991 Moscow, Russia; (A.S.K.); (P.Y.B.); (N.A.A.); (Y.M.E.); (P.S.T.)
| | - Anastasia S. Kuryanova
- Institute for Regenerative Medicine, Sechenov University, 8-2 Trubetskaya st., 119991 Moscow, Russia; (A.S.K.); (P.Y.B.); (N.A.A.); (Y.M.E.); (P.S.T.)
- Semenov Institute of Chemical Physics, Russian Academy of Sciences, 4 Kosygina st., 119991 Moscow, Russia
| | - Polina Y. Bikmulina
- Institute for Regenerative Medicine, Sechenov University, 8-2 Trubetskaya st., 119991 Moscow, Russia; (A.S.K.); (P.Y.B.); (N.A.A.); (Y.M.E.); (P.S.T.)
| | - Nadejda A. Aksenova
- Institute for Regenerative Medicine, Sechenov University, 8-2 Trubetskaya st., 119991 Moscow, Russia; (A.S.K.); (P.Y.B.); (N.A.A.); (Y.M.E.); (P.S.T.)
- Semenov Institute of Chemical Physics, Russian Academy of Sciences, 4 Kosygina st., 119991 Moscow, Russia
| | - Yuri M. Efremov
- Institute for Regenerative Medicine, Sechenov University, 8-2 Trubetskaya st., 119991 Moscow, Russia; (A.S.K.); (P.Y.B.); (N.A.A.); (Y.M.E.); (P.S.T.)
| | - Zulfar I. Khaibullin
- Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences (ISPM RAS), 70 Profsoyuznaya st., 117393 Moscow, Russia; (Z.I.K.); (P.L.I.); (T.A.A.)
| | - Pavel L. Ivanov
- Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences (ISPM RAS), 70 Profsoyuznaya st., 117393 Moscow, Russia; (Z.I.K.); (P.L.I.); (T.A.A.)
| | - Nastasia V. Kosheleva
- Faculty of Biology, Lomonosov Moscow State University, 12-1, Leninskie Gory, 119234 Moscow, Russia;
- FSBSI “Institute of General Pathology and Pathophysiology”, 8, Baltiyskaya st., 125315 Moscow, Russia
| | - Peter S. Timashev
- Institute for Regenerative Medicine, Sechenov University, 8-2 Trubetskaya st., 119991 Moscow, Russia; (A.S.K.); (P.Y.B.); (N.A.A.); (Y.M.E.); (P.S.T.)
- Semenov Institute of Chemical Physics, Russian Academy of Sciences, 4 Kosygina st., 119991 Moscow, Russia
- Chemistry Department, Lomonosov Moscow State University, 1-3 Leninskiye Gory, 119991 Moscow, Russia
| | - Tatiana A. Akopova
- Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences (ISPM RAS), 70 Profsoyuznaya st., 117393 Moscow, Russia; (Z.I.K.); (P.L.I.); (T.A.A.)
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Beltrán FR, Arrieta MP, Gaspar G, de la Orden MU, Martínez Urreaga J. Effect of Iignocellulosic Nanoparticles Extracted from Yerba Mate ( Ilex paraguariensis) on the Structural, Thermal, Optical and Barrier Properties of Mechanically Recycled Poly(lactic acid). Polymers (Basel) 2020; 12:polym12081690. [PMID: 32751154 PMCID: PMC7463788 DOI: 10.3390/polym12081690] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 07/24/2020] [Accepted: 07/27/2020] [Indexed: 12/20/2022] Open
Abstract
In this work, yerba mate nanoparticles (YMNs) were extracted from Ilex paraguairiencis yerba mate wastes and further used to improve the overall performance of mechanically recycled PLA (PLAR). Recycled PLA was obtained by melt reprocessing PLA subjected to an accelerated ageing process, which involved photochemical, thermal and hydrothermal ageing steps, as well as a final demanding washing step. YMNs (1 and 3 wt. %) were added to the PLAR during the melt reprocessing step and further processed into films. The main goal of the development of PLAR-YMNs bionanocomposites was to increase the barrier properties of recycled PLA, while showing good overall performance for food packaging applications. Thus, optical, structural, thermal, mechanical and barrier properties were evaluated. The incorporation of YMNs led to transparent greenish PLAR-based films with an effective blockage of harmful UV radiation. From the backbone FTIR stretching region (bands at 955 and 920 cm−1), it seems that YMNs favor the formation of crystalline domains acting as nucleating agents for PLAR. The morphological investigations revealed the good dispersion of YMNs in PLAR when they are used in the lowest amount of 1 wt. %, leading to bionanocomposites with improved mechanical performance. Although the addition of high hydrophilic YMNs increased the water vapor transmission, the addition of 1 wt. % of YMNs enhanced the oxygen barrier performance of the produced bionanocomposite films. These results show that the synergistic revalorization of post-consumer PLA and nanoparticles obtained from agri-food waste is a potential way for the production of promising packaging materials that meet with the principles of the circular economy.
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Affiliation(s)
- Freddys R. Beltrán
- Dpto. Ingeniería Química Industrial y Medio Ambiente, Universidad Politécnica de Madrid, E.T.S.I. Industriales, 28006 Madrid, Spain; (G.G.); (J.M.U.)
- Grupo de Investigación: Polímeros, Caracterización y Aplicaciones (POLCA), 28006 Madrid, Spain;
- Correspondence: (F.R.B.); (M.P.A.)
| | - Marina P. Arrieta
- Dpto. Ingeniería Química Industrial y Medio Ambiente, Universidad Politécnica de Madrid, E.T.S.I. Industriales, 28006 Madrid, Spain; (G.G.); (J.M.U.)
- Grupo de Investigación: Polímeros, Caracterización y Aplicaciones (POLCA), 28006 Madrid, Spain;
- Correspondence: (F.R.B.); (M.P.A.)
| | - Gerald Gaspar
- Dpto. Ingeniería Química Industrial y Medio Ambiente, Universidad Politécnica de Madrid, E.T.S.I. Industriales, 28006 Madrid, Spain; (G.G.); (J.M.U.)
| | - María U. de la Orden
- Grupo de Investigación: Polímeros, Caracterización y Aplicaciones (POLCA), 28006 Madrid, Spain;
- Dpto. Química Orgánica, Facultad de Óptica y Optometría, Universidad Complutense de Madrid, 28037 Madrid, Spain
| | - Joaquín Martínez Urreaga
- Dpto. Ingeniería Química Industrial y Medio Ambiente, Universidad Politécnica de Madrid, E.T.S.I. Industriales, 28006 Madrid, Spain; (G.G.); (J.M.U.)
- Grupo de Investigación: Polímeros, Caracterización y Aplicaciones (POLCA), 28006 Madrid, Spain;
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21
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Louisy E, Fontaine G, Gaucher V, Bonnet F, Stoclet G. Comparative studies of thermal and mechanical properties of macrocyclic versus linear polylactide. Polym Bull (Berl) 2020. [DOI: 10.1007/s00289-020-03290-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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22
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Li R, Ye L, Zhao X, Coates P, Caton-Rose F. Enhancing Poly(lactic acid) Microcellular Foams by Formation of Distinctive Crystalline Structures. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c00537] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ruiguang Li
- State Key Laboratory of Polymer Materials Engineering of China, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Lin Ye
- State Key Laboratory of Polymer Materials Engineering of China, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Xiaowen Zhao
- State Key Laboratory of Polymer Materials Engineering of China, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Phil Coates
- School of Engineering, Design and Technology, University of Bradford, Bradford BD7 1AZ, U.K
| | - Fin Caton-Rose
- School of Engineering, Design and Technology, University of Bradford, Bradford BD7 1AZ, U.K
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23
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Safandowska M, Rozanski A, Galeski A. Plasticization of Polylactide after Solidification: An Effectiveness and Utilization for Correct Interpretation of Thermal Properties. Polymers (Basel) 2020; 12:polym12030561. [PMID: 32143346 PMCID: PMC7182837 DOI: 10.3390/polym12030561] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 02/27/2020] [Accepted: 02/29/2020] [Indexed: 11/16/2022] Open
Abstract
Polylactide/triethyl citrate (PLA/TEC) systems were prepared in two ways by introducing TEC to solidified polymer matrix (SS) and by blending in a molten state (MS) to investigate the effectiveness of the plasticization process after solidification of polylactide. The plasticization processes, independently of way of introducing the TEC into PLA matrix, leads to systems characterized by similar stability, morphology and properties. Some differences in mechanical properties between MS and SS systems result primarily from the difference in the degree of crystallinity/crystal thickness of the PLA matrix itself. Based on the presented results, it was concluded that the plasticization process after solidification of polylactide is an alternative to the conventional method of modification-blending in a molten state. Then, this new approach to plasticization process was utilized for interpretation of thermal properties of PLA and PLA/TEC systems. It turned out that double melting peak observed at DSC thermograms does not result from the melting of a double population of crystals with different lamellar thickness, or the melting of both the α' and α crystalline phase (commonly used explanations in literature), but is associated with the improvement of perfection of crystalline structure of PLA during heating process.
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Affiliation(s)
- Marta Safandowska
- Correspondence: (M.S.); (A.R.); Tel.: +48-42-680-3236 (M.S.); +48-42-680-3228 (A.R.)
| | - Artur Rozanski
- Correspondence: (M.S.); (A.R.); Tel.: +48-42-680-3236 (M.S.); +48-42-680-3228 (A.R.)
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24
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Beltrán FR, Climent-Pascual E, de la Orden MU, Martínez Urreaga J. Effect of solid-state polymerization on the structure and properties of mechanically recycled poly(lactic acid). Polym Degrad Stab 2020. [DOI: 10.1016/j.polymdegradstab.2019.109045] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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25
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The Crystallization and Melting Behaviors of PDLA-b-PBS-b-PDLA Triblock Copolymers. CHINESE JOURNAL OF POLYMER SCIENCE 2019. [DOI: 10.1007/s10118-020-2361-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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27
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Palacios JK, Liu G, Wang D, Hadjichristidis N, Müller AJ. Generating Triple Crystalline Superstructures in Melt Miscible PEO‐
b
‐PCL‐
b
‐PLLA Triblock Terpolymers by Controlling Thermal History and Sequential Crystallization. MACROMOL CHEM PHYS 2019. [DOI: 10.1002/macp.201900292] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Jordana K. Palacios
- POLYMAT and Polymer Science and Technology DepartmentFaculty of ChemistryUniversity of the Basque Country UPV/EHU Paseo Manuel de Lardizabal 3 20018 Donostia‐San Sebastián Spain
| | - Guoming Liu
- Beijing National Laboratory for Molecular SciencesCAS Research/Education Center for Excellence in Molecular SciencesCAS Key Laboratory of Engineering PlasticsInstitute of ChemistryChinese Academy of Sciences Beijing 100190 China
| | - Dujin Wang
- Beijing National Laboratory for Molecular SciencesCAS Research/Education Center for Excellence in Molecular SciencesCAS Key Laboratory of Engineering PlasticsInstitute of Chemistry, Chinese Academy of Sciences Beijing 100190 China
| | - Nikos Hadjichristidis
- King Abdullah University of Science and TechnologyPhysical Sciences and Engineering DivisionKAUST Catalysis Center Thuwal 23955 Saudi Arabia
| | - Alejandro J. Müller
- POLYMAT and Polymer Science and Technology DepartmentFaculty of ChemistryUniversity of the Basque Country UPV/EHU Paseo Manuel de Lardizabal 3 20018 Donostia‐San Sebastián Spain
- IkerbasqueBasque Foundation for Science Bilbao 48013 Spain
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28
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Effect of small molecule organics on the crystallization behavior and mechanical properties of poly(ethylene 2,6-naphthalate). Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.02.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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29
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Suljovrujic E, Milicevic D. On the enthalpy of melting of poly(l-lactide). INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION 2019. [DOI: 10.1080/1023666x.2019.1598635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Edin Suljovrujic
- Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia
| | - Dejan Milicevic
- Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia
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30
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Rigid filler toughening in PLA-Calcium Carbonate composites: Effect of particle surface treatment and matrix plasticization. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2018.12.042] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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31
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Moraczewski K, Stepczyńska M, Malinowski R, Karasiewicz T, Jagodziński B, Rytlewski P. The Effect of Accelerated Aging on Polylactide Containing Plant Extracts. Polymers (Basel) 2019; 11:polym11040575. [PMID: 30960559 PMCID: PMC6523449 DOI: 10.3390/polym11040575] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 03/19/2019] [Accepted: 03/23/2019] [Indexed: 12/17/2022] Open
Abstract
In this study, natural extracts of plant origin were used as anti-aging compounds of biodegradable polymers. Coffee (0.5–10 wt%), cocoa, or cinnamon extracts were added to the polylactide matrix. The obtained materials were subjected to an accelerated aging process (720, 1440, or 2160 h) at 45 °C and 70% relative humidity under continuous UV radiation. The effectiveness of the tested extracts was compared to a commercially available anti-aging compound, 2 wt% of butylated hydroxytoluene. Visual evaluation, scanning electron microscopy, melt flow rate, thermogravimetry, differential scanning calorimetry, tensile strength, and impact tensile tests were performed. We show that the use of smaller amounts of tested extracts is particularly advantageous, which do not adversely affect the properties of polylactide-based materials at low contents. At the same time, their effectiveness in stabilizing tested properties during the accelerated aging process is mostly comparable to or greater than the reference compound.
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Affiliation(s)
- Krzysztof Moraczewski
- Faculty of Mathematics, Physics & Technical Sciences, Kazimierz Wielki University, Chodkiewicza 30, 85-064 Bydgoszcz, Poland.
| | - Magdalena Stepczyńska
- Faculty of Mathematics, Physics & Technical Sciences, Kazimierz Wielki University, Chodkiewicza 30, 85-064 Bydgoszcz, Poland.
| | - Rafał Malinowski
- Institute for Engineering of Polymer Materials and Dyes, Marii Skłodowskiej-Curie 55, 87-100 Toruń, Poland.
| | - Tomasz Karasiewicz
- Faculty of Mathematics, Physics & Technical Sciences, Kazimierz Wielki University, Chodkiewicza 30, 85-064 Bydgoszcz, Poland.
| | - Bartłomiej Jagodziński
- Faculty of Mathematics, Physics & Technical Sciences, Kazimierz Wielki University, Chodkiewicza 30, 85-064 Bydgoszcz, Poland.
| | - Piotr Rytlewski
- Faculty of Mathematics, Physics & Technical Sciences, Kazimierz Wielki University, Chodkiewicza 30, 85-064 Bydgoszcz, Poland.
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Sun X, Luo F, Yan D. The preparation of chain branching PLLA by intermolecular hydrogen bonding with 3-Pentadecylphenol and its crystallization, relaxation behavior and thermal stability. JOURNAL OF POLYMER RESEARCH 2019. [DOI: 10.1007/s10965-019-1729-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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33
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Beltrán FR, Barrio I, Lorenzo V, Del Río B, Martínez Urreaga J, de la Orden MU. Valorization of poly(lactic acid) wastes via mechanical recycling: Improvement of the properties of the recycled polymer. WASTE MANAGEMENT & RESEARCH : THE JOURNAL OF THE INTERNATIONAL SOLID WASTES AND PUBLIC CLEANSING ASSOCIATION, ISWA 2019; 37:135-141. [PMID: 30204060 DOI: 10.1177/0734242x18798448] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Poly(lactic acid) (PLA) is a biobased polymer that represents one of the most interesting alternatives to fossil-fuel based polymers in food packaging applications. Most of the PLA used in food packaging is used only once and then discarded, even though the PLA types used in packaging have good properties and stability. Therefore, it seems reasonable to consider the possibility of recycling the used polymer through a mechanical recycling process. The main aims of this work are to study the effect of the mechanical recycling on the properties of PLA and the usefulness of different upgrading methods to obtain recycled PLA with improved properties. A commercial type of PLA was subjected to accelerated thermal, photochemical and hydrolytic aging and then reprocessed. During reprocessing, aged PLA was blended with virgin PLA and a commercial chain extender was added. Results point out that recycling causes the degradation of PLA, and negatively affects the thermal stability and mechanical properties. However, addition of virgin PLA, and the chain extender, led to an increase of up to 9% in the intrinsic viscosity and 8% in the Vickers hardness of the recycled material. These results suggest that mechanically recycled PLA with improved performance can be obtained, a fact which might improve the recyclability of PLA and thus the environmental impact of this material.
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Affiliation(s)
- F R Beltrán
- 1 Departamento Ingeniería Química Industrial y Medio Ambiente, Universidad Politécnica de Madrid, E.T.S.I. Industriales, Madrid, Spain
- 2 Polymers, Characterization and Applications Research Group
| | - I Barrio
- 1 Departamento Ingeniería Química Industrial y Medio Ambiente, Universidad Politécnica de Madrid, E.T.S.I. Industriales, Madrid, Spain
| | - V Lorenzo
- 2 Polymers, Characterization and Applications Research Group
| | - B Del Río
- 3 E.T.S.I. Industriales, Universidad Politécnica de Madrid, Madrid, Spain
| | - J Martínez Urreaga
- 1 Departamento Ingeniería Química Industrial y Medio Ambiente, Universidad Politécnica de Madrid, E.T.S.I. Industriales, Madrid, Spain
- 2 Polymers, Characterization and Applications Research Group
| | - M U de la Orden
- 2 Polymers, Characterization and Applications Research Group
- 4 Departamento de Química Orgánica I, Universidad Complutense de Madrid, Facultad de Óptica y Optometría, Madrid, Spain
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Di Lorenzo ML, Androsch R. Influence of α′-/α-crystal polymorphism on properties of poly(l-lactic acid). POLYM INT 2018. [DOI: 10.1002/pi.5707] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
| | - René Androsch
- Interdisciplinary Center for Transfer-oriented Research in Natural Sciences (IWE TFN); Martin Luther University Halle-Wittenberg; Halle/Saale Germany
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35
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Beltrán FR, Lorenzo V, Acosta J, de la Orden MU, Martínez Urreaga J. Effect of simulated mechanical recycling processes on the structure and properties of poly(lactic acid). JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 216:25-31. [PMID: 28506670 DOI: 10.1016/j.jenvman.2017.05.020] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 04/04/2017] [Accepted: 05/07/2017] [Indexed: 06/07/2023]
Abstract
The aim of this work is to study the effects of different simulated mechanical recycling processes on the structure and properties of PLA. A commercial grade of PLA was melt compounded and compression molded, then subjected to two different recycling processes. The first recycling process consisted of an accelerated ageing and a second melt processing step, while the other recycling process included an accelerated ageing, a demanding washing process and a second melt processing step. The intrinsic viscosity measurements indicate that both recycling processes produce a degradation in PLA, which is more pronounced in the sample subjected to the washing process. DSC results suggest an increase in the mobility of the polymer chains in the recycled materials; however the degree of crystallinity of PLA seems unchanged. The optical, mechanical and gas barrier properties of PLA do not seem to be largely affected by the degradation suffered during the different recycling processes. These results suggest that, despite the degradation of PLA, the impact of the different simulated mechanical recycling processes on the final properties is limited. Thus, the potential use of recycled PLA in packaging applications is not jeopardized.
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Affiliation(s)
- F R Beltrán
- Dpto. Ingeniería Química Industrial y Medio Ambiente, Grupo "Polímeros, Caracterización y Aplicaciones", Universidad Politécnica de Madrid, E.T.S.I. Industriales, Madrid, 28006, Spain
| | - V Lorenzo
- Dpto. Ingeniería Química Industrial y Medio Ambiente, Grupo "Polímeros, Caracterización y Aplicaciones", Universidad Politécnica de Madrid, E.T.S.I. Industriales, Madrid, 28006, Spain
| | - J Acosta
- Dpto. Mecánica, Química y Diseño Industrial, Universidad Politécnica de Madrid, E.T.S.I. Diseño Industrial, Madrid, 28012, Spain
| | - M U de la Orden
- Dpto. Ingeniería Química Industrial y Medio Ambiente, Grupo "Polímeros, Caracterización y Aplicaciones", Universidad Politécnica de Madrid, E.T.S.I. Industriales, Madrid, 28006, Spain
| | - J Martínez Urreaga
- Dpto. Ingeniería Química Industrial y Medio Ambiente, Grupo "Polímeros, Caracterización y Aplicaciones", Universidad Politécnica de Madrid, E.T.S.I. Industriales, Madrid, 28006, Spain.
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36
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Im SH, Kim CY, Jung Y, Jang Y, Kim SH. Biodegradable vascular stents with high tensile and compressive strength: a novel strategy for applying monofilaments via solid-state drawing and shaped-annealing processes. Biomater Sci 2018; 5:422-431. [PMID: 28184401 DOI: 10.1039/c7bm00011a] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Monofilaments such as those consisting of polyamide (PA), polydioxanone (PDS), and poly(vinylidene fluoride) (PVDF), have been commonly used in various industries. However, most are non-biodegradable, which is unfavorable for many biomedical applications. Although biodegradable polymers offer significant benefits, they are still limited by their weak mechanical properties, which is an obstacle for use as a biomaterial that requires high strength. To overcome the current limitations of biodegradable monofilaments, a novel solid-state drawing (SSD) process was designed to significantly improve the mechanical properties of both PA and poly(l-lactic acid) (PLLA) monofilaments in this study. Both PA and PLLA monofilaments exhibited more than two-fold increased tensile strength and a highly reduced thickness using SSD. In X-ray diffraction and scanning electron microscopy analyses, it was determined that SSD could not only promote the α-crystal phase, but also smoothen the surface of PLLA monofilaments. To apply SSD-monofilaments with superior properties to cardiovascular stents, a shaped-annealing (SA) process was designed as the follow-up process after SSD. Using this process, three types of vascular stents could be fabricated, composed of SSD-monofilaments: double-helix, single-spring and double-spring shaped stents. The annealing temperature was optimized at 80 °C to minimize the loss of mechanical and physical properties of SSD-monofilaments for secondary processing. All three types of vascular stents were tested according to ISO 25539-2. Consequently, it was confirmed that spring-shaped stents had good recovery rate values and a high compressive modulus. In conclusion, this study showed significantly improved mechanical properties of both tensile and compressive strength simultaneously and extended the potential for biomedical applications of monofilaments.
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Affiliation(s)
- Seung Hyuk Im
- KU-KIST Graduate School of Converging Science and Technology, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Korea. and Center for Biomaterials, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea
| | - Chang Yong Kim
- KU-KIST Graduate School of Converging Science and Technology, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Korea. and Center for Biomaterials, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea
| | - Youngmee Jung
- Center for Biomaterials, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea and Korea University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea
| | - Yangsoo Jang
- Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Soo Hyun Kim
- KU-KIST Graduate School of Converging Science and Technology, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Korea. and Center for Biomaterials, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea and Korea University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea
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37
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Szustakiewicz K, Stępak B, Antończak A, Maj M, Gazińska M, Kryszak B, Pigłowski J. Femtosecond laser-induced modification of PLLA/hydroxyapatite composite. Polym Degrad Stab 2018. [DOI: 10.1016/j.polymdegradstab.2018.01.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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38
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Gardella L, Mincheva R, De Winter J, Tachibana Y, Raquez JM, Dubois P, Monticelli O. Synthesis, characterization and stereocomplexation of polyamide 11/polylactide diblock copolymers. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2017.11.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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39
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Altuntas E, Salan T, Karaogul E, Aydemir D. Effects of MA-g-PP and lignocellulosic filler addition on several properties of poly(L-lactic acid)/polypropylene composites. INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION 2017. [DOI: 10.1080/1023666x.2017.1391738] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Ertugrul Altuntas
- Department of Forest Industrial Engineering, Faculty of Forestry, Kahramanmaras Sutcu Imam University, Kahramanmaras, Turkey
| | - Tufan Salan
- Department of Forest Industrial Engineering, Faculty of Forestry, Kahramanmaras Sutcu Imam University, Kahramanmaras, Turkey
| | - Eyyup Karaogul
- Department of Food Engineering, Engineering Faculty, Harran University, Sanliurfa, Turkey
| | - Deniz Aydemir
- Department of Forest Industrial Engineering, Faculty of Forestry, Bartin University, Bartin, Turkey
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40
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Tashiro K, Kouno N, Wang H, Tsuji H. Crystal Structure of Poly(lactic acid) Stereocomplex: Random Packing Model of PDLA and PLLA Chains As Studied by X-ray Diffraction Analysis. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01468] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Kohji Tashiro
- Graduate
School of Engineering, Toyota Technological Institute, Tempaku, Nagoya 468-8511, Japan
| | - Naoto Kouno
- Graduate
School of Engineering, Toyota Technological Institute, Tempaku, Nagoya 468-8511, Japan
| | - Hai Wang
- Graduate
School of Engineering, Toyota Technological Institute, Tempaku, Nagoya 468-8511, Japan
| | - Hideto Tsuji
- Toyohashi University
of Technology, Toyohashi 441-8580, Japan
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41
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Li J, Liao X, Yang Q, Li G. Crystals in Situ Induced by Supercritical CO2 as Bubble Nucleation Sites on Spherulitic PLLA Foam Structure Controlling. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b02348] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Junsong Li
- College of Polymer Science
and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065 Sichuan, China
| | - Xia Liao
- College of Polymer Science
and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065 Sichuan, China
| | - Qi Yang
- College of Polymer Science
and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065 Sichuan, China
| | - Guangxian Li
- College of Polymer Science
and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065 Sichuan, China
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42
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Palacios JK, Tercjak A, Liu G, Wang D, Zhao J, Hadjichristidis N, Müller AJ. Trilayered Morphology of an ABC Triple Crystalline Triblock Terpolymer. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01576] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
| | | | - Guoming Liu
- Beijing
National Laboratory for Molecular Sciences, CAS Key Laboratory of
Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Dujin Wang
- Beijing
National Laboratory for Molecular Sciences, CAS Key Laboratory of
Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Junpeng Zhao
- Faculty
of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
| | - Nikos Hadjichristidis
- Physical
Sciences and Engineering Division, KAUST Catalysis Center, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
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43
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44
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Hakim RH, Cailloux J, Santana OO, Bou J, Sánchez-Soto M, Odent J, Raquez JM, Dubois P, Carrasco F, Maspoch ML. PLA/SiO2
composites: Influence of the filler modifications on the morphology, crystallization behavior, and mechanical properties. J Appl Polym Sci 2017. [DOI: 10.1002/app.45367] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- R. H. Hakim
- Centre Català del Plàstic (CCP), Universitat Politécnica de Catalunya Barcelona Tech (EEBE-UPC); Terrassa 08222 Spain
| | - J. Cailloux
- Centre Català del Plàstic (CCP), Universitat Politécnica de Catalunya Barcelona Tech (EEBE-UPC); Terrassa 08222 Spain
| | - O. O. Santana
- Centre Català del Plàstic (CCP), Universitat Politécnica de Catalunya Barcelona Tech (EEBE-UPC); Terrassa 08222 Spain
| | - J. Bou
- Department of Chemical Engineering; Universitat Politécnica de Catalunya Barcelona Tech (ETSEIB-UPC), Pavellò G, planta 1; Barcelona 08028 Spain
| | - M. Sánchez-Soto
- Centre Català del Plàstic (CCP), Universitat Politécnica de Catalunya Barcelona Tech (EEBE-UPC); Terrassa 08222 Spain
| | - J. Odent
- Laboratory of Polymeric and Composite Materials; Center of Innovation and Research in Materials & Polymers (CIRMAP), University of Mons UMONS; Mons B-7000 Belgium
| | - J. M. Raquez
- Laboratory of Polymeric and Composite Materials; Center of Innovation and Research in Materials & Polymers (CIRMAP), University of Mons UMONS; Mons B-7000 Belgium
| | - P. Dubois
- Laboratory of Polymeric and Composite Materials; Center of Innovation and Research in Materials & Polymers (CIRMAP), University of Mons UMONS; Mons B-7000 Belgium
| | - F. Carrasco
- Department of Chemical Engineering, Agriculture and Food Technology; Universitat de Girona (UdG); Girona 17071 Spain
| | - M. Ll. Maspoch
- Centre Català del Plàstic (CCP), Universitat Politécnica de Catalunya Barcelona Tech (EEBE-UPC); Terrassa 08222 Spain
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45
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Rohindra D, Kuboyama K, Ougizawa T. Pressure dependence of equilibrium melting temperature of poly (lactic acid). POLYMER 2017. [DOI: 10.1016/j.polymer.2017.04.078] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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46
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47
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Finotti PFM, Costa LC, Capote TSO, Scarel-Caminaga RM, Chinelatto MA. Immiscible poly(lactic acid)/poly(ε-caprolactone) for temporary implants: Compatibility and cytotoxicity. J Mech Behav Biomed Mater 2017; 68:155-162. [PMID: 28171812 DOI: 10.1016/j.jmbbm.2017.01.050] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 01/27/2017] [Accepted: 01/29/2017] [Indexed: 11/28/2022]
Abstract
This manuscript focuses on the effect of the addition of a low molecular weight triblock copolymer derived from ε-caprolactone and tetrahydrofuran (CT) on the compatibility and cytotoxicity of immiscible poly(lactic acid) (PLA) and poly(ε-caprolactone) (PCL) blends. Binary and tertiary PLA/PCL blends were prepared by melt mixing in a twin-screw extruder and their morphological, mechanical and thermal behaviors were investigated by scanning electron microscopy (SEM), tensile and Izod impact test, dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC). SEM micrographs showed the CT copolymer suppressed the coalescence phenomena and maintained the size of dispersed PCL domains at approximately 0.35µm. Bioresorbable PLA/PCL blends containing 5wt% of CT copolymer exhibited a remarkable increase in ductility and improved toughness at room temperature. Although the CT copolymer increased the interfacial adhesion, the DMA results suggest it also acts as a plasticizer exclusively for the PCL phase. The cell viability evaluated by the XTT assay confirmed PLA/PCL blends compatibilized by CT copolymer exerted no cytotoxic effect.
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Affiliation(s)
- Pablo F M Finotti
- Department of Materials Engineering, Engineering School of São Carlos, University of São Paulo - USP, São Carlos, São Paulo 13563-120, Brazil
| | - Lidiane C Costa
- Department of Materials Engineering, Federal University of São Carlos - UFSCar, São Carlos, São Paulo 13565-905, Brazil
| | - Ticiana S O Capote
- Department of Morphology, School of Dentistry at Araraquara, São Paulo State University - UNESP, Araraquara, São Paulo 14801-603, Brazil
| | - Raquel M Scarel-Caminaga
- Department of Morphology, School of Dentistry at Araraquara, São Paulo State University - UNESP, Araraquara, São Paulo 14801-603, Brazil
| | - Marcelo A Chinelatto
- Department of Materials Engineering, Engineering School of São Carlos, University of São Paulo - USP, São Carlos, São Paulo 13563-120, Brazil.
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48
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Amorphous Fractions of Poly(lactic acid). SYNTHESIS, STRUCTURE AND PROPERTIES OF POLY(LACTIC ACID) 2017. [DOI: 10.1007/12_2016_14] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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49
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Takasaki M, Fukushi N, Yoshizawa M, Onosato S, Hanada M, Takarada W, Kawahara Y, Kikutani T, Kobayashi H, Tanaka K. Multiple Melting Behavior of High-Speed Melt Spun Polylactide Fibers. J MACROMOL SCI B 2016. [DOI: 10.1080/00222348.2016.1273173] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Midori Takasaki
- Faculty of Materials Science and Engineering, Kyoto Institute of Technology, Kyoto, Japan
| | - Natsumi Fukushi
- Division of Domestic Science Education, Faculty of Education, Miyagi University of Education, Sendai, Japan
| | - Miku Yoshizawa
- Division of Domestic Science Education, Faculty of Education, Miyagi University of Education, Sendai, Japan
| | - Shota Onosato
- Division of Environmental Engineering Science, Gunma University, Kiryu, Japan
| | - Motohiro Hanada
- Division of Environmental Engineering Science, Gunma University, Kiryu, Japan
| | - Wataru Takarada
- Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, Tokyo, Japan
| | - Yutaka Kawahara
- Division of Environmental Engineering Science, Gunma University, Kiryu, Japan
- The Center for Fiber & Textile Science, Kyoto Institute of Technology, Kyoto, Japan
| | - Takeshi Kikutani
- Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, Tokyo, Japan
| | - Haruki Kobayashi
- Faculty of Materials Science and Engineering, Kyoto Institute of Technology, Kyoto, Japan
| | - Katsufumi Tanaka
- Faculty of Materials Science and Engineering, Kyoto Institute of Technology, Kyoto, Japan
- The Center for Fiber & Textile Science, Kyoto Institute of Technology, Kyoto, Japan
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50
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Beltrán F, de la Orden M, Lorenzo V, Pérez E, Cerrada M, Martínez Urreaga J. Water-induced structural changes in poly(lactic acid) and PLLA-clay nanocomposites. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.11.031] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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