反相乳液聚合法制备一种新型两性共聚物

合成了一种新型两性单体甲基丙烯酰氧乙基-N,N-二甲基-N-丙磺酸胺盐(DM PS),用核磁共振对DM PS进行表征,并利用反相乳液聚合法,以过硫酸钾(K2S2O8)-四甲基乙二胺(TMEDA)为氧化还原引发剂、Span80试剂为乳化剂,DM PS两性单体与丙烯酰胺(AM)共聚制得具有反聚电解质性质的两性共聚物poly(AM-co-DM PS),考察了影响反相乳液聚合的因素。获得最佳反应条件:35℃,V(环己烷)∶V(水)=2∶3,ρ(Span80)=2.0g/dL,m(DM PS)∶m(AM)=0.30,ρ(DM PS+AM)=30g/dL,c(K2S2O8)=3.2mm ol/L,c(TMEDA)=4.0mm ol/L,在此条件下,两性共聚物的特性黏数为6.5dL/g,收率91%以上。

Synthesis of a Novel Amphoteric Copolymer by Inverse Emulsion Polymerization

Amphoteric copolymers are widely applied in oil extraction,mining,paper making etc because of their antipolyelectrolyte effect.A novel amphoteric monomer of N,N-dimethyl-N-methacryloyloxyethyl-N-(3-sulfo-propyl)ammonium(DMPS)was successfully synthesized and was characterized by means of ~1H NMR.The amphoteric copolymer of acrylamide(AM)and DMPS was prepared by inverse emulsion polymerization using K_2S_2O_8-TMEDA(N,N,N′,N′-tetra-methyl ethylene diamine)as initiator and Span80 as emulsifier.Effects of several factors on intrinsic viscosity and yields of amphoteric copolymer poly(AM-co-DMPS)were studied.Under the optimum reaction conditions: temperature 35℃,V(cyclohexane) ∶V(water)=2 ∶3,ρ(Span80)=2.0g/dL,(m(DMPS)) ∶(m(AM)=)0.30,ρ(DMPS+AM)=30g/dL,c(K_2S_2O_8)=3.2mmol/L,and(c(TMEDA)=)4.0mmol/L,intrinsic viscosity and yield of copolymer could reach 6.5dL/g and 91%,respectively.