中和方式对AMPS-AM交联共聚物凝胶溶胀性能的影响

Influence of neutralizer on the swelling property of crosslinked co-polymeric gels of AMPS and AM

分别采用氢氧化钠(NaOH)、三乙胺(Triethylamine,TEA)和咪唑(Imidazole,iMz)中和2-丙烯酰胺基-2-甲基丙磺酸(2-acrylamido-2-methyl-1-propane sulfonic acid,AMPS)水溶液,再以N,N'-亚甲基双丙烯酰胺(N,N'-methylenebisacrylamide,MBAm)为交联剂,以过硫酸铵(Ammonium persulphate,APS)为引发剂,以丙烯酰胺(Acrylamide,AM)为共聚单体,采用水溶液聚合法合成了poly(AMPS-Na-co-AM)、poly(AMPS-TEAco-AM)以及poly(AMPS-iMz-co-AM)凝胶,并对这3种凝胶的溶胀性能进行了研究.结果表明,poly(AMPSNa-co-AM)凝胶吸水352 g/g,不吸收有机溶剂;poly(AMPS-TEA-co-AM)凝胶吸水218 g/g,对丁胺、乙醇、N-甲基吡咯烷酮和二甲亚砜等多种有机溶剂具有吸收作用;poly(AMPS-iMz-co-AM)凝胶吸水186 g/g,吸收二甲亚砜267 g/g,但不吸收其它有机溶剂.

2-acrylamido-2-methyl-1-propane sulfonic acid （ AMPS ） was neutralized with triethylamine （TEA）, imidazole （iMz） and sodium hydroxide （NaOH） in aqueous solution, respectively.Co-poly-meric gels of acrylamide （ AM） and the neutralized AMPS were prepared by aqueous solution polymeriza-tion using N, N′-methylenebisacrylamide （MBAm） as a crosslinker, and ammonium persulfate （APS） as an initiator .Swelling behavior of the gels in water and a series of organic liquids were gravimetrically investigated .The results showed the absorbency of poly （ AMPS-Na-co-AM） gels for water was 352 g/g, and it did not swell in organic liquids; the absorbency of poly （ AMPS-TEA-co-AM） gels for water was 218 g/g, and it also showed absorbency for a series of organic liquids;the absorbency of poly （ AMPS-iMz-co-AM） gels for water and DMSO was 186 g/g and 267 g/g respectively, it did not swell in other or-ganic liquids .