SULFONATED POLYPHOSPHAZENE COPOLYMER PROTON EXCHANGE MEMBRANE MATERIAL AND METHOD FOR PREPARING SUCH MEMBRANE

摘要

A sulfonated polyphosphazene copolymer proton exchange membrane material, and a method for preparing such membrane includes a macromolecule initiator as bromo polyphosphazene is subjected to atom transfer radical polymerization with styrene, yielding a graft copolymer, which is hydrazinolyzed with hydrazine hydrate resulting in a copolymer including a hydroxyl group. The copolymer is reacted with 1,4-butane sultone to yield a sulfonated copolymer finally. The polymer is cross-linked with 2,6-di(hydroxymethyl)-4-methyl phenol (BHMP) as a cross linking agent in the presence of methyl sulfonic acid, yielding cross-linked proton exchange membrane. Such cross-linked graft copolymer membrane has high proton conductivity, low methanol hindrance, and low cost, and has ideal effect when applied in fuel cells as proton exchange membrane material.

主权项

1. A chemical composition for a sulfonated polyphosphazene copolymer proton exchange membrane material, the composition comprising:
a polyphosphazene-graft-sulfonated polystyrene copolymer, being comprised of a copolymer of polyphosphazene with polystyrene with a side chain, and a plurality of aliphatic sulfonate group grafted onto said side chain, the polyphosphazene-graft-sulfonated polystyrene copolymer having a structural formula below: wherein R1 is —OCH3 or —F; wherein R2 is Na or H; wherein n is a number of phosphazene residue units the corresponding to length of a polyphosphazene chain; wherein x is a number of styrene residue units, ranging from 0 to 100; wherein y is a number of p-(4-sulfonato butoxy)styrene residue units, ranging from 0 to 100; wherein m is a number of combination units of styrene residues and p-(4-sulfonato butoxy)styrene residues, ranging from 0 to 100; and wherein r indicates that the copolymer of styrene residue and p-(4-sulfonato butoxy)styrene residue is a random copolymer.