Crystallization of poly(lactic acid) accelerated by cyclodextrin complex as nucleating agent |
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Authors: | Ru Zhang Yaming Wang Kaojin Wang Guoqiang Zheng Qian Li Changyu Shen |
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Affiliation: | 1. National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, 97 Wenhua Road, Zhengzhou, 450002, China 2. Key Laboratory of Advanced Materials Processing & Mold, Ministry of Education, Zhengzhou, China
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Abstract: | Poly(lactic acid) (PLA) is a well-known biodegradable and biocompatible polyester with intrinsically slow crystallization rate. To extend its applications to the field where heat resistance is required, increasing the crystallization rate of the material becomes critical. In this note, the nucleation effect of supramolecular inclusion complex (IC), organized by non-covalent interactions through threading α-cyclodextrin molecules onto PLA chains, on the crystallization of PLA was investigated by differential scanning calorimetry (DSC) and polarized optical microscopy. The formation of IC was confirmed by wide-angle X-ray diffraction and DSC measurements. It was found that the presence of PLA-IC significantly promoted the crystallization of PLA from both the non-isothermal and isothermal crystallization experiments. The nucleation mechanism was also discussed to some extent. |
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