溶剂诱导的聚乳酸/聚乳酸衍生物共结晶行为

doi:10.19894/j.issn.1000-0518.200236

摘要/Abstract

摘要： 通过溶液浇铸法制备不同组分的左旋聚乳酸(PLLA)和聚(L-2-羟基-3-甲基丁酸)(PL-2H3MB)共混物。运用差示扫描量热仪(DSC)、偏光显微镜(POM)、广角X射线衍射(WAXD)和热重分析仪(TGA)分析共混物的结晶、熔融行为和热稳定性。通过观察到DSC加热曲线中新的熔融峰判断PLLA和PL-2H3MB共晶的形成,共晶显著提高PLLA起始结晶温度和WAXD曲线中特征衍射峰的变化,证实了溶液浇铸共混物中的共结晶现象。同时,共混物中PL-2H3MB和PLLA还表现出优于单组分PLLA和PL-2H3MB的热稳定性。 PLLA和PL-2H3MB的共结晶行为可能为调控PLLA的热稳定性、力学性能以及降解性能提供了一种新的潜在方法。

关键词: 聚乳酸, 聚(L-2-羟基-3-甲基丁酸), 溶液浇铸共混物, 共结晶, 热稳定性

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

中图分类号:

O631.2

曹友錋, 庞烜, 项盛, 王天昶, 冯立栋, 边新超, 李杲, 陈学思. 溶剂诱导的聚乳酸/聚乳酸衍生物共结晶行为[J]. 应用化学, 2021, 38(1): 60-68.

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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