Synthesis and Solution Properties of Acrylamide-4-vinylbenzenesulfonate-n-butyl Styrene Tercopolymer PAnBS

A hydrophobically associating anionic terpolymer PAnBS was prepared by free-radical micelle copolymerization of acrylamide,sodium 4-vinylbenzenesulfonate(SSS) and n-butyl styrene(nBS).PAnBS offers a solution to the the problem of poor thermal stability of the hydrophobically associating water-soluble polymers.The structure of the synthesized polymer was characterized by means of UV,FTIR,and 1HNMR.The influence of polymerization reaction conditions on the apparent viscosity of the polymerization product aqueous solution was studied.The optimum reaction conditions were determined as follows:mole percentage of nBS,SSS and initiator were 1.5%,9% and 0.1% relative to total monomers,mass percentage of total monomers and surfactant(SDS) were 25% and 6%,and the reaction temperature and reaction time were 50 ℃ and 10 h respectively.The viscosity-increasing ability of PAnBS prepared under the above reaction conditions in sodium chloride or calcium chloride aqueous solution is stronger than that of partially hydrolyzed polyacrylamide with molecular weight of 1.97 × 107 and hydrolysis degree of 19.43%.The viscosity of polymer aqueous solution declined slightly with the increase of temperature,which indicate that the synthesized copolymer had good performance of salt and temperature resistance.