Journal
CHINESE JOURNAL OF POLYMER SCIENCE
Volume 38, Issue 11, Pages 1267-1275Publisher
SPRINGER
DOI: 10.1007/s10118-020-2408-8
Keywords
Sustainable; Polymer blends; Poly(propylene carbonate); Stereocomplex polylactide
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Funding
- Chinese Academy of science and technology service network planning [KFJ-STS-QYZD-140]
- program of Cooperation of Hubei Province [IG201703N]
- Chinese Academy of Sciences, Innovation team project of Beijing Institute of Science and Technology [IG201703N]
- 13th five-year Science and Technology Research Program of the Education Department of Jilin Province [JJKH20190862KJ]
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Sustainable blends of poly(propylene carbonate) (PPC) and stereocomplex polylactide (sc-PLA) were prepared by melt blending equimolar poly(L-lactic acid) (PLLA) and poly(D-lactide acid) (PDLA) with PPC to form sc-PLA crystals in situ in the melt blending process. Differential scanning calorimetry analysis revealed that only sc-PLA, no homo-crystallization of PLLA or PDLA, formed in the PPC matrix as the sc-PLA content was more than 10 wt%. Very intriguingly, scanning electronic microscopy observation showed that sc-PLA was evenly dispersed in the PPC phase as spherical particles and the sizes of sc-PLA particles did not obviously increase with increasing sc-PLA content. As a consequence, the rheological properties of PPC were greatly improved by incorporation of sc-PLA. When the sc-PLA content was 20 wt%, a percolation network structure was formed, and the blends showed solid-like behavior. The sc-PLA particles could reinforce the PPC matrix, especially at a temperature above the glass transition temperature of PPC. Moreover, the Vicat softening temperature of PPC/sc-PLA blends could be increased compared with that of neat PPC.
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