由特性粘数测算聚合物-溶剂相互作用参数

本文根据Yamakawa两参数理论,并利用Flory-Krigbaum-Orofino(FKO)、修正的Flory-Krigbaum-Orofino(MFKO)、Kurata-Yamakawa(KY)三种模型理论和Krigbaum经验式,通过测定聚合物在溶液中的η]、η]θ和分子量来估算第二维利系数A_?,得到聚合物-溶剂相互作用参数X值。结果表明:对于聚苯乙烯-甲苯、聚环氧氯丙烷-环己酮、聚甲基丙烯酸甲酯-丁酮三种柔性链聚合物-溶剂体系,应用FKO、MFKO、KY三种模型理论和Krigbaum经验式所得数据比较一致。对于二酯酸纤维素-环已酮、聚芳酯-四氯乙烷两种分子链刚性较大的体系,除FKO理论以外,也能得到较一致的结果。可以认为,粘度法测定A_2和X值是一种简便、可靠的实验方法。

Prediction of polymer-solvent interaction parameters from intrinsic viscosities

This paper reports a study on the prediction of polymer-solvent interaction parametersand second virial coefficients based on the Yamakawa two-parameter theory using Flory-Krigbaum-Orofino (FKO), modified Flory-Krigbaum-Orofino (MFKO) and Kurata-Yama-kawa (KY) models and Krigbaum empirical relation given the intrinsic viscosity in a par-ticular solvent and the intrinsic viscosity under theta condition together with the molecu-lar weight of the polymer. The results showed that the experimental values were fitted well with all the FKO,MFKO and KY models and the Krigbaum relation for polystyrene-toluene, polyepichlo-rohydrin-cyclohexanone and PMMA-butanone systems. For cellulose diacetate-cyclo-hexanone and polyarylate-tetrachloroethane systems, with polymer chains being more ri-gid, all but FKO model could provide a better prediction. The intrinsic viscosity methodcantherefore be considered as a ready and reliable method for the prediction of polymer-sol-vent interaction parameters and second virial coefficients.