Cj. Li et al., IN AQUA SYNTHESIS OF A HIGH-MOLECULAR-WEIGHT ARYLETHYNYLENE POLYMER WITH REVERSIBLE HYDROGEL PROPERTIES, Chemical communications, (13), 1998, pp. 1351-1352
Palladium catalyzed copolymerization of 3,5-diiodobenzoic acid with ac
etylene gas in a basic aqueous medium provides a high molecular weight
(similar to 60000), zig-zag phenylethynylene polymer; the polymer has
been characterized by a variety of methods and has a high thermostabi
lity, is soluble in basic solutions and is reversibly switchable from
soluble to hydrogel states in water by changing the pH of the solvent.