聚合物液体的状态方程

Equations of State for Polymer Liquids

本文分析介绍了三个最广泛使用的聚合物液体状态方程，Ｆｌｏｒｙ、ＳＬ和ＳＳ方程及作者开发的三个新方程ＳＨＴ、ＳＨＴＦ和ＯＣＭ的理论基础和假设，并用１５个聚合物液体、１７个大分子量烃液体和６个常用有机溶剂的Ｐ－Ｖ－Ｔ数据作了比较。结果表明，ＯＣＭ方程精度最好，其他方程精度按ＳＳ、ＳＨＴ、ＳＨＴＦ、Ｆｌｏｒｙ、ＳＬ依次变差。结论是开放胞腔更接近液体的真实结构，空穴的引入可以改进胞腔理论的计算精度，Ｌ－Ｊ位能可以较好地反映液体中分子间的作用力。

Theoretical basis and assumptions for the three most widely used equations of state for polymer liquids,named Flory,SL and SS EOSs,and the three new equations of state proposed by the author,named SHT,SHTF and OCM EOSs were introduced in this paper.The comparisions were made using the P-V-T experimental data of 15 polymer liquids,17 large molecular weight hydrocarbons and 6 organic solvehts. The results show that OCM EOS gave the best accuracy,the accuracy became worse in the order of SS,SHT,SHTF,Flory,SL.The conclutions are that,Open-Cell Model is most close to the real structure of liquids,the introduction of holes can improve on the cell model,and that the L-J potential can describe the interactions in liquids satisfactorily.