P(AN-AA)/P-PVA交联质子交换膜PAA膜的制备与性能研究OA北大核心

The emulsion copolymerization of acrylonitrile(AN)and acrylic acid(AA)was initiated in phosphorylated polyvinyl alcohol(P-PVA)aqueous solution to generate copolymer latex particles of AN and AA.The obtained polymer emulsion is cast into a film,and after heat treatment,a new type of proton exchange membrane is obtained,referred to as the PAA membrane.The performance of the PAA membrane is tested and characterized.Scanning electron microscopy results showed that the PAA membrane had a microstructure of dense accumulation of polymer colloidal particles.The results of infrared spectra indicated that the phosphoric acid molecules had been grafted onto the chain segments of the poly(vinyl alcohol),and a crosslinking reaction occurred between P-PVA and polyacrylic acid after heat treatment.The conductivity measurements showed that as the degree of phosphorylation of poly(vinyl alcohol)increased,the proton conductivity of the membrane also increased,with a maximum of 1.18×10-4 S/cm at 160℃.The study indicated that a proton transport channel was formed in the membrane,which had a microscopic two-phase structure of proton donor and proton acceptor,without relying on liquid water.