摘要
考察了每分子或重复单元的外部自由度参数ｃ１对低密度聚乙烯－溶剂与聚苯乙烯－溶剂体系中应用ＵＮＩＦＡＣ－ＦＶ模型进行估算的重量分率表示的溶剂亨利系数的影响，并给出ｃ１的选择原则．低密度聚乙烯－溶剂体系：芳烃取ｃ１＝１．１，脂肪烃取ｃ１＝２．０；聚苯乙烯－溶剂体系；芳烃取ｃ１＝２．０；低密度聚乙烯－极性溶剂和聚苯乙烯－脂肪烃及极性溶剂体系中ｃ１随溶剂不同而变化（表３）．
he UNIFAC-FV model has been applied to predict the weight-fraction Henry's constants of solvents in low-density polyethylene and in polystyrene in the region of 100 to250℃. By adjusting the number of external degrees of freedom per hydrocarbon molecule,the weightfraction Henry's constants was correlated with good agreement by the model. Theregularity of of is given out. The values of of is 2. 0 for aromatic hydrocarbons in polystyrenesolutions, and 1. 1 and 2. 0 for aromatic and aliphatic hydrocarbons in polyethylene solutions, respectively. They are changed with the types of solvents for polar solvents inpolystyrene and in polyethylene.
基金
国家自然科学基金
国家教委基金
