Isothermal crystallization behavior and mechanical properties of polylactide/carbon nanotube nanocomposites |
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| Affiliation: | 1. Department of Organic and Nano Engineering, College of Engineering, Hanyang University, 17 Haengdang-dong, Sungdong-gu, Seoul 133-791, South Korea;2. Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University, 220, Gung-dong, Yuseong-gu, Daejeon 305-764, South Korea;1. The Faculty of Printing and Packaging Engineering, Xi''an University of Technology, Xi''an, Shaanxi, 710048, People''s Republic of China;2. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, People''s Republic of China;1. Institute of Advanced Manufacturing Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Changzhou, 213164, China;2. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, 230031, China;1. School of Materials and Mechanical Engineering of Beijing Technology & Business University, Beijing 100048, China;2. China Center for Food Safety Research, BTBU, Beijing 100048, China;1. The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China;2. CRRC Qingdao Sifang Rolling Stock Research Institute Co., Ltd, Qingdao 266031, China;3. School of Chemistry, State Key Laboratory of Biotherapy of Sichuan University, Chengdu 610065, China |
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| Abstract: | Carbon nanotube (CNT)–reinforced polylactide (PLA) nanocomposites were prepared using a melt compounding process employing a twin-screw extruder. The isothermal crystallization kinetics of PLA/CNT nanocomposites according to Avrami’s theory were analyzed using differential scanning calorimetry in the temperature range 90–120 °C. There was a significant dependence of CNT on the crystallization behavior of the PLA matrix. The incorporation of CNT improved effectively the crystallization rate of PLA/CNT nanocomposites through heterogeneous nucleation. The nucleating effect of CNTs which increased the number of nucleation sites and decreased the average spherulite size was confirmed using polarized optical microscopy. The rheological properties of the PLA/CNT nanocomposites were also investigated. Changes in the microstructure of the PLA/CNT nanocomposites occurred by incorporating CNT. Furthermore, the tensile strength/modulus and thermal stability of PLA/CNT nanocomposites were enhanced when a very small quantity of CNT was added. This research accounts for the effect of CNTs, which significantly influenced the isothermal behavior, thermal stability, mechanical, and rheological properties of the PLA/CNT nanocomposites, providing a design guide for PLA/CNT nanocomposites in industrial fields. |
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