Chemical modification of poly(lactic acid) and its use as matrix in poly(lactic acid) poly(butylene adipate-co-terephthalate) blends |
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| Affiliation: | 1. Universidade Federal de São Carlos, Department of Materials Engineering, Rod. Washington Luiz, Km 235, 13565-905, São Carlos, S.P., Brazil;2. Universidade de São Paulo, Department of Materials Engineering, Av. João Dagnone, 1100 Jd. Sta Angelina, 13563-120, São Carlos, S.P., Brazil;1. Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, 117576, Singapore;2. Singapore Institute of Manufacturing Technology, Agency for Science, Technology and Research (A*STAR), 73 Nanyang Drive, 637662, Singapore;3. Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, 138634, Singapore;1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, China;2. College of Material Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014, China;3. School of Materials Science and Engineering, Fujian University of Technology, Fuzhou, 350118, China;1. Université de Lyon, INSA de Lyon, CNRS, F-69361 Lyon, France;2. UMR 5223, IMP, Ingénierie des matériaux polymères, INSA Lyon, F-69621 Villeurbanne, France;3. UMR 5259, LaMCoS, Laboratoire de Mécanique des Contacts et des Structures, F69621 Villeurbanne, France;4. Mines ParisTech, PSL – Research University, CEMEF (CEntre de Mise En Forme des matériaux), CNRS UMR 7635, CS 10207 rue Claude Daunesse, 06904 Sophia Antipolis Cedex, France;1. Department of Metallurgical and Materials Engineering Department, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, 34469, Maslak, Istanbul, Turkey;2. Center for High Performance Polymer and Composite Systems (CREPEC), Chemical Engineering Department, Polytechnique Montreal, Montreal, Quebec, H3T 1J4, Canada;3. CREPEC, Chemical Engineering Department, McGill University, Montreal, Quebec, H3A 2B2, Canada;1. Departamento de Ciencia y Tecnología de Polímeros and POLYMAT, Facultad de Ciencias Químicas UPV/EHU, P.O. Box 1072, San Sebastián 20080, Spain;2. Université de Pau et des Pays de l’Adour/CNRS IPREM UMR5254, Equipe de Physique et Chimie des Polymères, 2, Avenue du Président Angot, 64053 Pau, France |
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| Abstract: | Poly(lactic acid), PLA, was chemically modified with maleic anhydride (MA) by reactive extrusion. The effect of this modification on molar mass (MM) and acidity was assessed by means of size-exclusion chromatography (SEC) and titration, respectively. PLA MM decreased in the presence of MA solely and of MA and peroxide. Reduction in MM was monitored by the increase in acidity. PLA blends containing poly(butylene adipate-co-terephthalate) (PBAT) were prepared through different mixing protocols, PLA/PBAT, PLA-g-MA/PBAT and PLA/PBAT/MA/peroxide (PLA/PBAT in situ). SEC results and rheological properties revealed reduction in MM and viscosity of the modified blends. PLA/PBAT presented increase in MM and bimodal MM distribution. The calculated interfacial tension was significantly lower for the modified blends, despite the lower average particle area of PLA/PBAT. Surprisingly, the modified blends presented higher yield strength than that predicted by the rule of mixtures, which might indicate interfacial reactions. |
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| Keywords: | Poly(lactic acid) Polymer blends Reactive extrusion Modification |
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