摘要
Abstract
The reaction enthalpy change, reaction entropy change, Gibbs free energy change(ΔrGθ) and equilibrium constants(Kp) of the four possible reactions for coupling of ethylene carbonate and dimethyl succinate to poly (ethylene glycol succinate) oligomers in the temperature range of 433 to 533K were calculated by using the group contribution method. Results showed that for reaction (2) and (4), they were exothermic, and their ΔrGθwere less than zero, so both of the reactions were spontaneous and high temperature was unfavorable. However, for reaction (1) and (3), they were endothermic, and their ΔrGθ were greater than zero, so both of the reactions were not spontaneous. The Kp for reaction (2) was greater than that for reaction (3), which indicated that the reaction (2) could be carried out more easily.关键词
碳酸乙烯酯/丁二酸二甲酯/聚丁二酸乙二醇酯预聚体/合成/热力学分析/基团贡献法Key words
ethylene carbonate/dimethyl succinate/poly(ethylene glycol succinate) oligomer/synthesis/thermodynamic analysis/group contribution method分类
化学化工
