Abstract:

A zwitterionic monomer of 3-(N,N-dimethylamino-N-sulfopropane propyl acrylamide)(DMAPAAS) was prepared by the ring opening reaction of 1,3-cyclopropanesultone with N,N-dimethylamino propyl acrylamide(DMAPAA) at 55 ℃ for 20 h. Zwitterionic copolymers P(AM-DMAPAAS) containing sulfobetaine groups were synthesized by copolymerization of AM and DMAPAAS in aqueous solution. The copolymers were characterized and the solubility of copolymers P(AM-DMAPAAS) was evaluated. The viscosity of the copolymers was determined. The results show that the viscosity of the copolymers in brine solution is greater than that in deionized water, and the viscosity in Mg2+ and Ca2+ salt solution is increased as the salt concentration is increased. The copolymers exhibit a typical antipolyelectrolyte behavior. Under the situation where the same temperature is increased, the viscosity retention of the zwitterionic copolymer is 1.4 times of that of PAM.

Key words: Zwitterionic copolymer, Antipolyelectrolyte solutional property, viscosity, copolymerization