Solution-Induced Co-crystallization in Poly(lactic acid)/ Substituted Poly(lactic acid) Blends

doi:10.19894/j.issn.1000-0518.200236

Chinese Journal of Applied Chemistry ›› 2021, Vol. 38 ›› Issue (1): 60-68.DOI: 10.19894/j.issn.1000-0518.200236

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Solution-Induced Co-crystallization in Poly(lactic acid)/ Substituted Poly(lactic acid) Blends

CAO You-Peng^1,2, PANG Xuan¹, XIANG Sheng¹, WANG Tian-Chang¹, FENG Li-Dong¹, BIAN Xin-Chao¹, LI Gao^1,2*, CHEN Xue-Si^1,2

¹Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
²University of Science and Technology of China, Hefei 230026, China

Received:2020-08-06 Revised:2020-09-30 Published:2021-01-01 Online:2021-02-01
Supported by:
National Natural Science Foundation of China (Nos.51973220, 51773194, 51973219) and the National Key Research and Development Program of China (No.2016YFB0302500)

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Abstract

Abstract: The blends of poly(L-lactic acid) (PLLA) and poly(L-2-hydroxy-3-methylbutanoic acid) (PL-2H3MB) with different compositions were prepared by solution casting. The crystallization, melting and pyrolysis properties of the blends were investigated by differential scanning calorimetry (DSC), polarized optical microscope (POM), wide angle X-ray diffractometry (WAXD) and thermogravimetric analysis (TGA). The formation of PLLA and PL-2H3MB co-crystals was speculated due to the observation of the new melting peak in DSC first heating profile. The co-crysals significantly increased the initial crystallization temperature of PLLA and the characteristic diffraction peaks in WAXD profile were also shifted, which both confirmed the co-crystallization phenomenon in solution casting blend. At the same time, the thermal stability of PLLA/PL-2H3MB blends was better than that of neat PLLA or PL-2H3MB. The co-crystallization behavior of PLLA and PL-2H3MB may provided a new potential method to regulate the thermal stability, mechanical properties and degradation properties of PLLA.

Key words: Poly(lactic acid), Poly(l-2-hydroxy-3-methylbutanoic acid), Solution-casted blends, Co-crystallization, Thermal stability

CLC Number:

O631.2

CAO You-Peng, PANG Xuan, XIANG Sheng, WANG Tian-Chang, FENG Li-Dong, BIAN Xin-Chao, LI Gao, CHEN Xue-Si. Solution-Induced Co-crystallization in Poly(lactic acid)/ Substituted Poly(lactic acid) Blends[J]. Chinese Journal of Applied Chemistry, 2021, 38(1): 60-68.

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Solution-Induced Co-crystallization in Poly(lactic acid)/ Substituted Poly(lactic acid) Blends

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