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利用分散聚合技术,在硫酸铵水溶液中以丙烯酰胺(AM)、丙烯酸(AA)、丙烯酰氧乙基三甲基氯化铵(DAC)、甲基丙烯酰氧乙基三甲基氯化铵(DMC)为单体,合成了两性共聚物P(AM-co-AA-co-DAC-co-DMC).用FTIR,13C-NMR,TEM等方法表征了聚合物的结构和组成.考察了不同分散稳定剂、正负离子单体配比和pH对分散聚合的影响,并对P(AM-co-AA-co-DAC-co-DMC)水基分散聚合条件及稳定性进行了一些探讨.实验表明,在硫酸铵水溶液中制得较稳定的P(AM-co-AA-co-DAC-co-DMC)分散体系,应选用非离子型或阳离子型的分散稳定剂,如聚乙烯吡咯烷酮(PVP)、聚甲基丙烯酰氧乙基三甲基氯化铵(PDMC)、聚丙烯酰氧乙基三甲基氯化铵(PDAC),而其pH应在2到4之间.当选用占总质量1.5%的聚乙烯吡咯烷酮(PVP)为分散稳定剂,引发温度为40℃,正负离子单体物质的量比值大于1,pH=3时,可以制得总离子度超过25%的纳米级两性聚合物.
By using dispersion polymerization technology, acrylamide (AM), acrylic acid (AA), acryloyloxyethyltrimethylammonium chloride (DAC), methacryloyloxyethyltrimethylammonium chloride (DMC) as monomer to synthesize the amphiphilic copolymer P (AM-co-AA-co-DAC-co-DMC) .The structure and composition of the polymer were characterized by FTIR, 13C- The effects of different dispersion stabilizers, the ratio of cationic monomer to cationic monomer and pH on the dispersion polymerization were investigated. The conditions and stability of P (AM-co-AA-co-DAC-co-DMC) Experiments show that the dispersion of P (AM-co-AA-co-DAC-co-DMC) prepared in aqueous solution of ammonium sulfate should be selected as nonionic or cationic dispersion stabilizer such as polyvinylpyrrolidone PVP), polymethacryloxyethyl trimethyl ammonium chloride (PDMC), polyacryloxyethyl trimethyl ammonium chloride (PDAC), and its pH should be between 2 and 4. When used Polyvinylpyrrolidone (PVP), which accounts for 1.5% of the total mass, is a dispersion stabilizer with an initiation temperature of 40 ° C and an amount ratio of the positive and negative monomers of more than 1, and at pH = 3, a total of more than 25% Grade amphoteric polymer.