Citation: You-Peng CAO, Xuan PANG, Sheng XIANG, Tian-Chang WANG, Li-Dong FENG, Xin-Chao BIAN, Gao LI, Xue-Si CHEN. Solution-Induced Co-crystallization in Poly(lactic acid)/Substituted Poly(lactic acid) Blends[J]. Chinese Journal of Applied Chemistry, ;2021, 38(1): 60-68. doi: 10.19894/j.issn.1000-0518.200236 shu

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

You-Peng CAO ^{1, 2} ,
Xuan PANG ¹ ,
Sheng XIANG ¹ ,
Tian-Chang WANG ¹ ,
Li-Dong FENG ¹ ,
Xin-Chao BIAN ¹ ,
Gao LI ^{1, 2,,} ,
Xue-Si CHEN ^{1, 2}

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

Corresponding author: Gao LI, ligao@ciac.ac.cn
Received Date: 6 August 2020
Revised Date: 30 September 2020

Fund Project: the National Natural Science Foundation of China 51973220the National Natural Science Foundation of China 51773194the National Natural Science Foundation of China 51973219the National Key Research and Development Program of China 2016YFB0302500

Figures(9)

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