Isothermal crystallization kinetics and crystal structure of poly(lactic acid): Effect of triphenyl phosphate and talc

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Abstract

Abstract In this article, kinetics of neat poly(lactic acid) (PLA) and its blends with triphenyl phosphate (TPP) and/or talc crystallized isothermally in the temperature range of 113–128°C was analyzed by differential scanning calorimetry (DSC) and described by the Avrami equation. The results showed that the average value of Avrami exponents n is around 2.0 for neat PLA and the PLA/15TPP blend, and around 3.0 for the PLA/1.2Talc blend and the PLA/15TPP/1.2Talc blend. The crystallization rate constants k for neat PLA and its blends were increased in the following order: the PLA/15TPP blend, neat PLA, the PLA/15TPP/1.2Talc blend, and PLA/1.2Talc blend. The half‐time of crystallization t 1/2 was increased with an increase of crystallization temperature T c and the presence of TPP, and was decreased sharply with the incorporation of talc. Further investigation into crystallization activation energy Δ E a of neat PLA and its blends with 15 wt % TPP and/or 1.2 wt % talc showed that the values of Δ E a were increased with the incorporation of TPP and/or talc compared to that of neat PLA. It was verified by wide angle X‐ray diffraction (WAXD) that neat PLA and its blends with TPP and/or talc crystallized isothermally in the temperature range of 113–128°C, and all formed the α‐form crystal after enough annealing time. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

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