The Permeation and Swelling Behaviors between DMC, DEC, PC, EC and P(VDF-<i>co</i>-HFP)

Abstract

Recently, poly (vinylidene fluoride-co-hexafluoropropylene) (P(VDF-co-HFP)) has drawn the attention of many researchers as an excellent material for polymer electrolytes. In this paper, the homogeneous P(VDF-co-HFP) films were prepared by volatilizing solvent method. The swelling behaviors of P(VDF-co-HFP) films in four kinds of carbonate esters (dimethyl carbonate, diethyl carbonate, propylene carbonate, and ethylene carbonate) and the permeation behaviors of the four carbonate esters in P(VDF-co-HFP) films were investigated at 10, 20, 30, 40 and 50°C under atmospheric pressure. It was found that the liquid content and degree of elongation of P(VDF-co-HFP) films in the carbonate esters increased with the increasing temperature, following the order of DMC > PC > DEC > EC. The order of permeation flux of the carbonate esters in the P(VDF-co-HFP) films was DMC > DEC > PC = EC = 0. The swelling behaviors of P(VDF-co-HFP) films were explained by Hansen Solubility Parameter (HSP) theory.