Phase Behavior of Biodegradable Polymers in Dimethyl Ether and Dimethyl Ether + Carbon Dioxide
作者： Youn-Mo Kuk , Byung-Chul Lee , Youn Woo Lee , Jong Sung Lim
DOI: 10.1021/JE010056O
关键词: Lower critical solution temperature 、 Polymer chemistry 、 Supercritical fluid 、 Upper critical solution temperature 、 Biodegradable polymer 、 Dimethyl ether 、 Cloud point 、 Polymer 、 Chemistry 、 Phase (matter) 、 Analytical chemistry
摘要: Phase behavior data are presented for biodegradable polymers in high-pressure dimethyl ether (DME) and supercritical mixtures of DME carbon dioxide (CO2). The cloud point curves poly(d,l-lactide) (MW = 30000) were measured at polymer concentrations up to ∼15 mass % temperatures 373.15 K pressures 14 MPa using a variable-volume view cell apparatus. This system exhibited the characteristics lower critical solution temperature phase showed pressure−polymer concentration isotherms with maximum pressure ∼5 %. increased increasing molecular weight poly(d,l-lactide). For poly(d,l-lactide-co-glycolide) copolymers DME, decreasing d,l-lactide content copolymer caused single-phase region shrink changed curve from an upper behavior. points po...
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