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Self-Nucleation Efficiency of PDLA in PLAs: Crystallization Behavior and Morphology

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Abstract

Crystallization behavior and morphology of PLA blended with 0.05–1.00 wt % loadings of poly(D-lactic acid) (PDLA) forming stereocomplex crystallites as in-situ nucleating agents, were studied using wideangle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), and polarizing-light optical microscopy (POM). Blending PLA with small amount of PDLA does lead to formation of PLA stereocomplex (SC), although the PLA is a random copolymer. The in-situ formed SC crystal acted as nucleation sites in blends and accelerated the crystallization of PLA by decreasing the half-time (t1/2). The nucleation efficiency of PDLA obviously increased and the crystallization induction time decreased while the content of PDLA reached up to 0.20 wt %. While the content of PDLA is 0.2 wt %, the nucleation efficiency of PDLA is up to 43.8%, and the induction time decreased from 430 to 88 s. In addition, compared with pure PLA, t1/2 decreases from 15.1 to 3.5 min at Tc = 127.5°C while the amount PDLA is 1.0 wt %. The equilibrium melting temperature of PLA decreased from 187.2 to 181.2°C with the increase of PDLA content.

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Authors and Affiliations

  1. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, Jiangsu, 213164, China

    Guoxiang Zou, Xin Qu, Caixia Zhao, Yingjie He & Jinchun Li

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  1. Guoxiang Zou
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  2. Xin Qu
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  3. Caixia Zhao
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  4. Yingjie He
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  5. Jinchun Li
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Correspondence to Jinchun Li.

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Zou, G., Qu, X., Zhao, C. et al. Self-Nucleation Efficiency of PDLA in PLAs: Crystallization Behavior and Morphology. Polym. Sci. Ser. A 60, 206–214 (2018). https://doi.org/10.1134/S0965545X18020165

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  • DOI: https://doi.org/10.1134/S0965545X18020165

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