泡沫体系分散聚合制备两性聚丙烯酰胺

Preparation of Amphoteric Polyacrylamide by Dispersion Polymerization in Foam State

采用泡沫体系分散聚合法,用丙烯酰氧基乙基三甲基氯化铵(DAC)、丙烯酰胺(AM)、丙烯酸钠、丙烯酸(AA)制备了相对分子质量小且溶解性好的两性聚丙烯酰胺(P(DAC-AM-AA))。探讨了初始体系温度、NaHCO3用量、引发剂(NH4)2S2O8用量、分散剂PF127(聚氧化乙烯-氧化丙烯)用量、AM用量对产物特性黏数和单体总转化率的影响。实验结果表明,升高初始体系温度和增加NaHCO3用量均可提高产物特性黏数和单体总转化率;增加引发剂(NH4)2S2O8用量,单体总转化率增加,但产物特性黏数降低;分散剂PF127用量对反应结果的影响不大;随AM用量的增加,产物特性黏数和单体总转化率均先增加后降低。

Amphoteric terpolymer [ P （ acryloyloxyethyl trimethyl ammonium chloride （ DAC ） - acrylamide （AM）-acrylic acid（AA） ） ][ P（DAC-AM-AA） ] with low relative molecular mass and good solubility was prepared from DAC, AM, sodium acrylicacid and AA by dispersion polymerization in foam state. Effects of initial system temperature, sodium bicarbonate dosage, initiator dosage, dispersion agent PF127 （polyoxyethylene-polyoxypropylene）dosage and AM dosage on intrinsic viscosity of product and total conversion of monomers were investigated. Intrinsic viscosity and conversion rise with increasing initial system temperature and sodium bicarbonate dosage. Conversion rises but intrinsic viscosity drops with increase of initiator dosage. Dosage of dispersion agent PF127 affected only slightly on conversion and intrinsic viscosity. With increasing of AM dosage, conversion and intrinsic viscosity first rise and then drop.