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The Effect of Composite Nucleating Agent on the Crystallization Behavior of Branched Poly (Lactic Acid)

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Abstract

Composite nucleating agent (CNA) consisting of zinc oxide as a crystallization promoter and phenylphosphonic acid zinc salt (PPZn) as an heterogeneous nucleation agent was employed to improve the crystallization behaviors of branched poly (lactic acid) (B-PLA) which was prepared by use of multi-functional epoxy-based chain extender (CE). The differential scanning calorimeter results showed that the crystallinity and crystallization temperature of prepared B-PLA/CNA were higher than that of linear poly (lactic acid) (L-PLA) and B-PLA at a high cooling rate. The corresponding phenomena of heterogeneous nucleation of B-PLA/CNA were observed by means of polarized optical microscope. The crystalline mechanism research results show that the degradation reaction and chain extending reaction were occurred simultaneously after the addition of CE and CNA into the PLA, PPZn as an effective nucleation points could increase the nucleation density and the degraded short molecular chains with higher chain mobility would improve crystal growth during the crystallization of the branched PLA. Non-isothermal cold crystallization kinetics of various B-PLA with different content of CNA was studied. The corresponding result showed that the crystallinity and crystallization rate increased obviously with the CNA content greater than or equal to 5phr, as well as the crystallization time decreased. The similar experimental results of non-isothermal and isothermal melt crystallization kinetics also showed that CNA had a significant impact on crystallization behavior of B-PLA.

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Acknowledgements

This work was supported by Beijing Natural Science Foundation (2162012 and 2164058) and the National Science Foundation of China (51673004 and 51703004).

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Authors and Affiliations

  1. School of Materials and Mechanical Engineering, Beijing Technology and Business University, Beijing, 100048, People’s Republic of China

    Peng Chen, Kesong Yu, Yaqiao Wang, Wenbo Wang, Hongfu Zhou & Xiangdong Wang

  2. Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing, 100048, People’s Republic of China

    Peng Chen, Kesong Yu, Yaqiao Wang, Wenbo Wang, Hongfu Zhou & Xiangdong Wang

  3. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, People’s Republic of China

    Hangquan Li & Jianguo Mi

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  1. Peng Chen
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  2. Kesong Yu
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  3. Yaqiao Wang
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  4. Wenbo Wang
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  5. Hongfu Zhou
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  8. Xiangdong Wang
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Correspondence to Xiangdong Wang.

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Chen, P., Yu, K., Wang, Y. et al. The Effect of Composite Nucleating Agent on the Crystallization Behavior of Branched Poly (Lactic Acid). J Polym Environ 26, 3718–3730 (2018). https://doi.org/10.1007/s10924-018-1251-2

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  • DOI: https://doi.org/10.1007/s10924-018-1251-2

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