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应用ＵＮＩＦＡＣ－ＦＶ模型估算了低密度聚乙烯一溶剂体系中以重量分率表示的溶剂亨利常数，Ｈ；”．以及低密度聚乙一溶剂和聚苯乙烯一溶剂中无限稀释的溶剂活度系数Ｏｉｃ．结果表明，通过调节ＣＩ，ＵＮＩＦＡＣ－ＦＶ模型能较好地估算Ｈ７和Ｄ７．估算溶剂亨利常数时，低密度聚乙烯一溶剂体系：芳烃取ＣＩ—１１，脂肪烃取ＣＩ—２·０，低密度聚乙烯一极性溶剂体系中ＣＩ随溶剂不同而变化；估算无限稀释的溶剂活度系数时，ＣＩ值随聚合物一溶剂体系而变，且模型估算误差较前者为大；参数ｂ值随ＣＩ和温度而变；对脂肪烃、环已烷和极性溶剂之Ｄ７的估算，ＵＮＩＦＡＣ－ＦＶ模型有待进一步改进．
The UNIFAC-FV model was used to estimate the solvent Henry’s constant in percent by weight for a low-density polyethylene-solvent system and the solvent activity coefficient Oic for infinite dilution in a low-density polyethylene-solvent and polystyrene- . The results show that the UNIFAC-FV model can better estimate H7 and D7 by adjusting the CI. When estimating the Henry’s constant of the solvent, the low-density polyethylene-solvent system: CI-11 for aromatic hydrocarbons, CI-2.0 for aliphatic hydrocarbons, The CI of a low-density polyethylene in a polar solvent system varies with the solvent; in the case of an infinite dilution solvent activity index, the CI value changes with the polymer-solvent system and the model estimation error is larger than the former; the parameter b value Varies with CI and temperature; Estimates of D7 for aliphatic hydrocarbons, cyclohexane and polar solvents, UNIFAC-FV model needs further improvement.