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以苯乙烯 ( St)和甲基丙烯酸甲酯 ( MMA )为主单体 ,以丙烯醛 ( AL )为功能单体进行三元无皂乳液共聚合制备了具有反应活性的胶乳。用透射电子显微镜 ( TEM)观察了胶粒形态、大小 ,且考察了功能单体、引发剂过硫酸铵 ( APS)及交联剂二乙烯基苯 ( DVB)的浓度对胶粒形态、大小及分布的影响。同时 ,用电导滴定法测定了胶粒表面醛基的含量且探讨了功能单体的浓度及加料方法对胶粒表面醛基含量的影响。结果表明 :随AL浓度增大 ,胶粒直径 ( Dw)及其分散系数 ( Dp)增大且胶粒表面 -CHO含量增大而其百分比下降 ;随 APS及DVB浓度增大 ,Dw 减小而 Dp 增大。 AL在聚合后期加入有利于 -CHO分布在胶粒表面 ,而 AL分两批加入能进一步提高 -CHO在胶粒表面的分配量
Reactive latexes were prepared by ternary soap-free emulsion copolymerization using styrene (St) and methyl methacrylate (MMA) as main monomers with acrolein (AL) as the functional monomer. The morphology and size of the micelles were observed by transmission electron microscopy (TEM). The effects of functional monomer, initiator ammonium persulfate (APS) and crosslinking agent divinylbenzene (DVB) on the morphology, size and The impact of distribution. At the same time, the content of aldehyde groups on the surface of colloidal particles was measured by conductometric titration method and the influence of the concentration of functional monomers and the adding method on the aldehyde groups on the colloidal particles surface was discussed. The results showed that with the increase of AL concentration, the diameter of the micelles (Dw) and its dispersion coefficient (Dp) increased and the content of -CHO on the micelle surface increased while the percentage decreased. With the increase of APS and DVB concentration, Dw decreased Dp increases. The addition of AL in the late stage of polymerization favors the distribution of -CHO on the surface of colloidal particles, while the addition of AL in two batches can further increase the distribution of -CHO on the colloidal particles