Sustainable Blends of Poly(propylene carbonate) and Stereocomplex Polylactide with Enhanced Rheological Properties and H
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ARTICLE
POLYMER SCIENCE
https://doi.org/10.1007/s10118-020-2408-8 Chinese J. Polym. Sci.
Sustainable Blends of Poly(propylene carbonate) and Stereocomplex Polylactide with Enhanced Rheological Properties and Heat Resistance Yi Lia,b, Yan-Cun Yub, Chang-Yu Hanb*, Xian-Hong Wangb, and De-Xin Huanga a School of Materials Science and Engineering, Jilin Jianzhu University, Changchun 130118, China b Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
Abstract 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 scPLA 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. Keywords Sustainable; Polymer blends; Poly(propylene carbonate); Stereocomplex polylactide Citation: Li, Y.; Yu, Y. C.; Han, C. Y.; Wang, X. H.; Huang, D. X. Sustainable blends of poly(propylene carbonate) and stereocomplex polylactide with enhanced rheological properties and heat resistance. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-020-2408-8
INTRODUCTION Recently, an increase in carbon dioxide (CO2) emission due to the use of fossil fuel continues to raise concerns because of its greenhouse effect that causes global warming. Furthermore, it is anticipated that the emission rate of CO2 will continue to increase because carbon-based fossil fuels are still the main energy consumption for the next few decades.[1] As a result, tremendous effort has been made to reduce CO2 accumulation, such as CO2 capture and storage, and chemical conversion of CO2 into useful compounds. It is important to develop the products and processes for the utilization of CO2 as a feedstock for polymers from the standpoint of sustainable and green chemistry.[2] CO2 can be copolymerized with many epoxides to produce a series of alternating aliphatic polycarbonate copolymers, including poly(propylene carbonate) (PPC), poly(ethylene carbonate) (PEC), poly(butylene carbonate) (PBC), poly(cyclohexene carbonate) (PCHC), and so on.[3−5] These aliphatic polycarbonates
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