Shear-induced non-isothermal crystallization of poly(butylene adipate-co-terephthalate) |
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| Affiliation: | 1. Department of Polymer Materials, Shanghai University, 200444, Shanghai, China;2. Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022, Changchun, China;1. School of Chemistry and Chemical Engineering, Yangzhou University, Jiangsu 225002, China;2. Provincial Key Laboratory of Environmental Material and Engineering, Jiangsu 225002, China;3. Testing Center, Yangzhou University, Jiangsu 225002, 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 |
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| Abstract: | The influence of shear on non-isothermal crystallization of commercial poly(butylene adipate-co-terephthalate) (PBAT) was investigated. PBAT melt was sheared at 130 and 150 °C at rates of 10–100/s, and then cooled. The crystallization was followed by a light depolarization technique, whereas the crystallized specimens were analyzed by DSC, 2D-SAXS, 2D-WAXS, PLM and SALS. Shear flow shifted crystallization to higher temperature, and the effect was augmented by lower temperature of shearing as well as by higher shear rate and strain. Crystallization peak rate temperature of PBAT, sheared at 130 °C for 5 min at 100/s, increased by up to 12 °C. However, no evidence of crystal orientation due to shear was found, indicating that the shear induced the point-like nucleation. Only a small increase of melting peak temperatures, by up to 2–5 °C, was observed for the specimens sheared at the highest rates (≥50/s). |
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| Keywords: | Biodegradable polymers Flow-induced crystallization Structure Melting |
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