无规共聚型高分子乳化剂的合成及其在乳液中的应用

Synthesis of Random Copolymeric Emulsifier and Application in Emulsions

用自由基聚合法合成了无规共聚物聚苯乙烯/丙烯酸丁酯/甲基丙烯酸二甲氨基乙酯,以氯乙酸甲酯为季铵化试剂与聚合物进行季铵化反应,得到了无规型高分子乳化剂。用傅里叶变换红外光谱(FT-IR)、核磁共振氢谱(1H NMR)等对高分子乳化剂的结构进行了表征,差示扫描量热仪(DSC)测定了高分子乳化剂的玻璃化温度。将所得的高分子乳化剂用于苯丙乳液聚合中,探讨了乳化剂含量对乳液性能的影响。结果表明:得到的高分子乳化剂是无规共聚物,玻璃化温度为29.48℃;用4%(占单体总量)的乳化剂合成的乳液性能较好,单体转化率为97.5%,聚合所得乳液粒径分布窄,平均粒径为33.95 nm,乳液涂膜性能较好。

A random polymeric was synthesized via free radical polymerization, which was then converted into emulsifier by quarternizing with methyl chloroacetate. Fourier trransform infrared spectroscopy （FT - IR）, nuclear magnetic resonance （NMR）, gel permeation chromatography （GPC）, differential scanning calorimetry （DSC） analysis were used to characterize the composition and Ts of the emulsifier. A styrene - acrylic emulsion was synthesized at the presence of the obtained polymeric emulsifier, and the influence of the content of emulsifier on the performance of latexes was discussed and reported. The results indicated that the emulsifier was a random copolymer with glass transition temperature of 29.48 ℃, the latex obtained with 4% emulsifier （weight of the total monomers） showed good properties： monomer conversation 97.5% , narrow particle size distribution and Z - average diameter of emulsion particles 33.95 nm. The latex film provided excellent comprehensive properties.