论文部分内容阅读
利用无皂乳液聚合[1,2],在苯乙烯的乳液聚合体系中引入适量的苯乙烯磺酸钠参与共聚合。聚合过程中分两阶段料,第一阶段中苯乙烯磺酸钠与苯乙烯的比例是决定乳胶粒粒径及单分散性的关键因素。当反应达到较高的转化率时,加入第二阶段单体混合物,此阶段中的苯乙烯磺酸钠与苯乙烯的比例决定了最终胶粒表面电荷密度。利用上述两阶段无皂乳液聚合法制备了粒径在100～400nm,单分散性较好,表面电荷密度较高并且具有核壳结构的乳胶粒。在此基础上,讨论了的第一阶段中苯乙烯和苯乙烯磺酸钠的比例对乳胶粒粒径的影响以及乳胶粒粒径对微球表面电荷密度的影响。
Using soap-free emulsion polymerization [1,2], an appropriate amount of sodium styrene sulfonate is introduced into the styrene emulsion polymerization system to participate in the copolymerization. The polymerization process is divided into two stages of material, the first phase of sodium styrene sulfonate and styrene ratio is to determine the particle size and monodispersity of the key factors. When the reaction reaches a higher conversion, the second stage monomer mixture is added. The sodium styrenesulfonate to styrene ratio at this stage determines the surface charge density of the final micelle. The latex particles with a particle size of 100-400 nm, good monodispersity, high surface charge density and core-shell structure were prepared by the above two-stage soap-free emulsion polymerization. On this basis, the influence of the proportion of styrene and sodium styrenesulfonate in the first stage on the particle size of the latex and the influence of particle size on the surface charge density of the microsphere were discussed.