Proton-conducting phosphoric acid polyesters
Polimery 1999, No 1, 18
Aromatic and aliphatic polyesters of phosphoric acid were studied as potential components of proton-conducting membranes. The aromatic esters were obtained by hydrolysis of the products of condensation of phosphorus oxychloride with bisphenol A; the aliphatic polyesters were obtained by polyaddition ofphosphoric acid to diglycidyl ether of bisphenol A. The aromatic derivatives were found to be hydrolytically stable enough to be applicable as components of proton-conducting hydrogels. The ionic conductivities of the composite membranes of the polyesters and of N,N'-methylenediacrylamide and poly(vinylidene fluoride) ranged from ICH to 10-4—10-3 S cm-1 (Fig. 2). The aliphatic polyesters hydrolyzed with water at room temperature to yield low-molecular-weight oligomers (Fig. 4) and even after having been immobilized in hydrophobic polymeric networks were easy to wash out. They can be used to synthesize conducting gels with organic solvents used as the conducting phase.