Morphology and properties of biodegradable poly (lactic acid)/poly (butylene adipate-co-terephthalate) blends with different viscosity ratio |
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| Institution: | 1. College of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, China;2. Key Laboratory of Polymer Processing Engineering of the Ministry of Education, South China University of Technology, Guangzhou, 510640, China;3. National-certified Enterprise Technology Center, Kingfa Scientific and Technological Co. Ltd., Guangzhou, 510663, China;1. Department of Metallurgical and Materials Engineering Department, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey;2. Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada;3. Center for High Performance Polymer and Composite Systems (CREPEC), Chemical Engineering Department, Polytechnique Montreal, Montreal, Quebec H3T 1J4, Canada;4. CREPEC, Chemical Engineering Department, McGill University, Montreal, Quebec H3A 2B2, Canada;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. Institute of Nano- and Bio-polymeric Materials, Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, School of Material Science and Engineering, Tongji University, Shanghai 201804, China;2. KINGFA SCI.& TECH. CO.,LTD, Guangzhou 510663, China;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: | Phase morphology exerts a tremendous influence on the properties of polymer blends. The development of the blend morphology depends not only on the intrinsic structure of the component polymers but also on extrinsic factors such as viscosity ratio, shearing force and temperature in the melt processing. In this study, various poly (butylene adipate-co-terephthalate) (PBAT) materials with different melt viscosity were prepared, and then poly (lactic acid) (PLA)/PBAT blends with different viscosity ratio were prepared in a counter-rotating twin-screw extruder under constant processing conditions. The influence of viscosity ratio on the morphology, mechanical, thermal and rheological properties of PLA/PBAT (70/30 w/w) blends was investigated. The experimental results showed that the morphology and properties of PLA/PBAT blends strongly depended on the viscosity ratio. Finer size PBAT phase were observed for viscosity ratio less than 1 (λ < 1) compared to samples with λ > 1. It was found that the interfacial tensions of PLA and PBAT were significantly different when the viscosity ratio was changed, the lowest interfacial tensions (0.12 mN/m) was obtained when the viscosity was 0.77. Additionally, the maximal tensile strength in PLA/PBAT blends were obtained when the viscosity ratio was 0.44, while the maximal impact properties were obtained when the viscosity ratio was 1.95. |
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| Keywords: | Viscosity ratio Morphology Properties PLA/PBAT blends |
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