Crystallization kinetics and morphology of biodegradable poly(lactic acid) with a hydrazide nucleating agent |
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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. Department of Forestry, National Chung Hsing University, Taichung 402, Taiwan;2. Department of Materials Science and Engineering, National Chung Hsing University, Taichung 402, Taiwan;1. Materials Science and Engineering Program, School of Mechanical and Materials Engineering, Composite Materials and Engineering Center, Washington State University, P.O. BOX 641806, Pullman, 99164, USA;2. College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing, 100049, PR China;1. School of Materials and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, PR China;2. School of Materials and Metallurgical Engineering, Guizhou Institute of Technology, Guiyang City, Guizhou Province 550003, PR China;3. School of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China;1. Hubei Provincial Key Laboratory of Green Materials for Light Industry, Collaborative Innovation Center for Green Light-weight Materials and Processing, School of Materials Science and Engineering, Hubei University of Technology, Wuhan, Hubei Province 430068, PR China;2. Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, PR China;3. Key Laboratory for Large-Format Battery Materials and System of National Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei Province 430074, PR China |
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| Abstract: | The effect of tetramethylenedicarboxylic dibenzoylhydrazide (designated here as TMC) on the nonisothermal and isothermal crystallization behavior of PLA was investigated by differential scanning calorimetry (DSC), polarized optical microscopy (POM) and wide angle X-ray diffraction (WAXD). TMC shows excellent nucleating effect on PLA. With the addition of 0.05 wt% TMC, the crystallization half-time of PLA decreases from 26.06 to 6.13 min at 130 °C. The isothermal crystallization data were further analyzed by the Avrami model. The values of the Avrami exponent of the blends are comparable to that of neat PLA, indicating that the presence of TMC does not change the crystallization mechanism of the matrix. The observation from POM and WAXD measurements showed that the presence of TMC increases significantly the nuclei density of PLA but has no discernible effect on its crystalline structure. |
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| Keywords: | Poly(lactic acid) Hydrazide Crystallization kinetics Nucleation Morphology |
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