Preparation and characterization of poly(ethylene carbonate)/poly(lactic acid) blends

• 发表在: Journal of Polymer Research
• 主要作者: 2-s2.0-85041124959
• 格式: 文件
• 语言: English
• 出版: Springer Netherlands 2018
• 在线阅读: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85041124959&doi=10.1007%2fs10965-018-1451-4&partnerID=40&md5=e3d5ca982c3f62ab48b259236d8c0ce7

Poly(ethylene carbonate)/poly(lactic acid) blends were successfully prepared by means of a solution film-casting method, and their physicochemical properties were investigated. PEC/PLA blends exhibit partial miscibility and are characterized by the interaction of the ester and carbonic ester groups. One such interaction is between partial charges in –C–O– in –O–C=O of PLA and the carbonyl –C=O of PEC. Another is between –C–O– in –O–C=O of PLA and –C–O– in –CH2–O– of PEC. The value of Tg varies by more than 10 °C across the blends. PEC does not significantly influence the melting temperature of neat PLA, but non-spherical spherulites are formed in PEC-rich blends, whereas the spherulites are spherical with an average size of 30 μm in PLA-rich blends. Crystallization of PLA is influenced by the addition of flexible PEC and by the proportion of PLA in the blends. Interestingly, addition of at least 10 wt% PLA increased Tg, with a crystallinity, Xc of 47% and better thermal degradation properties, with the temperature at 5 wt% weight loss (Td5) more than 30 °C higher than for neat PEC. © 2018, Springer Science+Business Media B.V., part of Springer Nature.