Isothermal Crystallization and Melting Behavior of Composites Composed of Poly(L-lactic Acid) and Poly(glycolic Acid) Fibers |
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Authors: | Hechun Chen Chi Ma Wei Bai Dongliang Chen |
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Affiliation: | 1. Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, P. R. China;2. Graduate University of Chinese Academy of Sciences, Beijing, P. R. China |
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Abstract: | Several composites of poly (L-lactic acid) (PLLA) with poly (glycolic acid) (PGA) fibers were prepared. The isothermal crystallization kinetics and melting behavior of PLLA and all of the composites were characterized by using differential scanning calorimetry. The experimental data were processed by using the Avrami equation. The relative parameters, such as the Avrami exponent and half-time crystallization, revealed that PGA fibers had positive effects on the crystallization of PLLA, but these effects had only a minimal dependence on the PGA fiber content. Moreover, at low isothermal crystallization temperatures (85°C~110°C), recrystallization during the heating scan was observed, which could lower the melting point of the samples to a certain extent. |
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Keywords: | crystallization kinetics isothermal crystallization poly(glycolic acid) poly(L-lactic acid) polymer-matrix composites (PMCs) short-fiber composites |
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