Toughening polylactide by dynamic vulcanization with castor oil and different types of diisocyanates |
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| Institution: | 1. Univ. Bordeaux, Laboratoire de Chimie des Polymères Organiques, ENSCBP, 16 Avenue Pey-Berland, Pessac Cedex F 33607, France;2. CNRS, Laboratoire de Chimie des Polymères Organiques, Pessac Cedex F 33607, France;3. French Environment and Energy Management Agency, 20 avenue du Grésillé-BP 90406, Angers Cedex 01 F 49004, France;4. ITERG, 11 rue Gaspard Monge, Parc Industriel, Pessac Cedex F 33600, France;1. Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China;2. Zhejiang Hisun Biomaterials Co., Ltd, Taizhou 318000, Zhejiang, China;1. Ningbo Key Laboratory of Polymer Materials, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, PR China;2. College of Materials and Chemical Engineering, Hainan University, Haikou 570228, PR China;1. School of Mechanical Engineering, Guangdong Mechanical and Electrical College, Guangzhou 510515, China;2. National-certified Enterprise Technology Center, Kingfa Scientific and Technological Co. Ltd., Guangzhou 510663, China;3. College of Materials Science and Engineering, Key Laboratory of Polymer Processing Engineering of the Ministry of Education, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | Dynamic vulcanization of polylactide (PLA) with castor oil (CO) and three different diisocyanates, namely 4,4′-diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI) and isophorone diisocyanate (IPDI), was performed to study the effect of diisocyanate type on the vulcanization process and on the morphology as well as mechanical properties of the PLA/CO-based polyurethane blends. The reactivity of the three diisocyanate followed the order of MDI > HDI > IPDI when reacting with castor oil. Interfacial compatibilization between PLA and the CO-based polyurethane occurred when the less reactive HDI and IPDI was used. Among all the blends, PLA/CO-IPDI showed the finest morphology and the best toughening efficiency. Incorporation of 20 wt% CO-IPDI increased the elongation at break and notched impact strength of PLA by 47.3 and 6.6 times, respectively. Cavitation induced matrix plastic deformation was observed as the toughening mechanism for the PLA blends with CO-based polyurethane. The effect of CO-IPDI content on the morphology and mechanical properties of PLA was studied in detail. The particle size of dispersed CO-IPDI and the elongation at break increased gradually, the tensile strength and Young's modulus decreased gradually, while the impact strength first increased and then decreased with increasing CO-IPDI content from 5 to 30 wt%. The maximum impact strength appeared for the blends with 20 wt% CO-IPDI. |
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| Keywords: | Polylactide Castor oil Diisocyanate Dynamic vulcanization Toughening mechanism |
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