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研究了乳胶粒组成对含有缩水甘油基、羧基和胺基的丙烯酸酯多层核壳型乳液聚合稳定性的影响规律 ,探讨了聚合过程的凝聚机理。研究表明 :官能团间的交联凝聚作用和水溶性聚合物的架桥凝聚作用是本体系凝聚物形成的主要原因。随着中间层分率和 MMA比例的增加 ,分子量调节剂或水溶性单体的引入 ,体系的聚合稳定性提高。HEMA、AA和 MAA对聚合稳定性的提高程度依次增大 ,但当 MAA用量增加到一定值后 ,其量增加对聚合稳定性不再有明显影响。当壳层 DMAEMA用量增大时 ,聚合稳定性降低 ;但同时按比例增加各层官能团单体的用量 ,对聚合稳定性的影响不明显。
The effects of latex particle composition on the emulsion polymerization stability of acrylic multilayers with glycidyl, carboxyl and amine groups were investigated. The aggregation mechanism of the emulsion polymerization was also discussed. The results show that the main reason for the formation of the aggregates is the cross-linking and condensation of functional groups and the bridging and cohesion of water-soluble polymers. With the increase of interlayer ratio and MMA ratio, the polymerization stability of the system increased with the introduction of molecular weight regulator or water-soluble monomer. The increasing degree of HEMA, AA and MAA on the polymerization stability increased in turn, but when the amount of MAA increased to a certain value, the increase of the amount of polymerization stability no longer have a significant effect. When the amount of DMAEMA in the shell increases, the polymerization stability decreases. But at the same time, the amount of functional monomer in each layer increases proportionally, which has no obvious effect on the polymerization stability.