期刊
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
卷 147, 期 4, 页码 3171-3184出版社
SPRINGER
DOI: 10.1007/s10973-021-10716-3
关键词
Poly(vinyl acetate); Poly(lactic acid); Molecular weight; Stereocomplexation
资金
- Chinese Academy of science and technology service network planning [KFJ-STS-QYZD-140]
- Zhongshan Science and Technology Bureau [2017A1037]
- Beijing Institute of Science and Technology [IG201703N]
- 13th five-year Science and Technology Research Program of the Education Department of Jilin Province [JJKH20190862KJ]
The study shows that the addition of low-Mw PVAc can accelerate the crystallization of PLLA/PDLA components, while high-Mw PVAc can inhibit crystallization; blending with PVAc enhances the formation of SCs, with the best effect seen with low-Mw PVAc; only SCs are obtained in blends with 30% low-Mw PVAc, improving the thermomechanical properties.
The effects of molecular weight (M-w) and content of poly(vinyl acetate) (PVAc) on the crystallization behaviors, competing crystallization of homocrystallites and stereocomplex crystallites (SCs), crystalline structure, and mechanical properties of poly(L-lactic acid) (PLLA)/poly(D-lactic acid) (PDLA) blends were investigated. The crystallization of PLLA/PDLA component is accelerated after the addition of low-M-w PVAc and is suppressed with high-M-w PVAc. The ability of SC formation is enhanced via blending with PVAc, irrespective of its M-w, and becomes prominent with low-M-w PVAc. The exclusive SCs are obtained in the blends with 30 mass % low-M-w PVAc. The improvement in thermomechanical property above 170 degrees C is ascribed to the enhancement of SC content. This work presents guidance for achieving the melt processability of SC-PLA, thus proving their potential as a high-performance substitute for conventional plastics.
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