双重响应N-乙烯基己内酰胺、甲基丙烯酸共聚微凝胶的研究

以N-乙烯基己内酰胺、甲基丙烯酸为单体,N,N-亚甲基双丙烯酰胺为交联剂,过硫酸钾为引发剂,利用沉淀聚合法合成了一系列具有pH和温度双重响应性的微凝胶。利用红外光谱技术对微凝胶进行了结构表征,结果表明,制备的微凝胶是两种单体的共聚物;分别利用光散射技术和浊度法考察了微凝胶的温度响应性和pH响应性,结果表明这些微凝胶具有良好的温度和pH响应性。

Investigation on Dual-Responsive N-Vinylcaprolactam and Methacrylic Acid Copolymer Microgels

The microgel particles were synthesized by precipitation copolymerization of vinyl caprolactam （VCL） and methacrylic acid （MAA）, using N, N′-methylenediacrylamide and potassium persulfate as crosslinker and initiator, respectively. The structure of the final product was proved by IR. IR result indicates that the prepared microgels are copolymers of VCL and MAA. The thermo-sensitivity of the microgels was investigated by light scattering method and the pH-sensitivity was investigated by spectrophotometer. The results indicate that these microgels have good pH- and temperature sensitivity and obvious volume phase transition temperature.