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首页> 外文期刊>Journal of Applied Polymer Science >Kinetic analysis of poly(N-isopropylacrylamide-co-dimethylaminoethyl methacrylate) microgel latex formation
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Kinetic analysis of poly(N-isopropylacrylamide-co-dimethylaminoethyl methacrylate) microgel latex formation

机译：聚（N-异丙基丙烯酰胺-甲基丙烯酸二甲氨基乙基乙酯）微凝胶胶乳形成的动力学分析

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摘要

Curves of the conversion and particle size versus the time in the preparation of poly(N-isopropylacrylamide-co-dimethylaminoethyl methacrylate) microgel latices by surfactant-free emulsion polymerization were measured. The copolymerization reactions were rapid, and their rates increased with the dimethylaminoethyl methacrylate (DMAEMA) concentration in the polymerization recipe. Particle formation occurred by a homogeneous nucleation mechanism, in which DMAEMA helped to colloidally stabilize the primary particles. In addition, a strong dependence of the water-soluble-polymer (WSP) formation on the DMAEMA concentration was found, and the DMAEMA content in the WSP was significantly higher than that in the microgel particle. A drastic variation of the crosslinking density within the microgel particle during the polymerization process was found through a comparison of the particle size determined by quasi-elastic light scattering with that determined by transmission electron microscopy. Finally, on the basis of these results, the mechanism of particle formation in this polymerization process was examined. (C) 2004 Wiley Periodicals, Inc. [References: 18]
机译：测量了通过无表面活性剂乳液聚合制备聚（N-异丙基丙烯酰胺-甲基丙烯酸二甲基氨基乙基酯）微凝胶胶乳的转化率和粒径与时间的关系曲线。共聚反应迅速，并且其速率随着聚合配方中甲基丙烯酸二甲基氨基乙基酯（DMAEMA）浓度的增加而增加。颗粒形成是通过均相成核机制发生的，其中DMAEMA有助于胶体稳定一次颗粒。此外，发现水溶性聚合物（WSP）的形成对DMAEMA浓度的强烈依赖性，并且WSP中的DMAEMA含量明显高于微凝胶颗粒。通过将准弹性光散射测定的粒径与透射电子显微镜测定的粒径进行比较，发现聚合过程中微凝胶颗粒内的交联密度发生了剧烈变化。最后，基于这些结果，研究了该聚合过程中颗粒形成的机理。 （C）2004 Wiley Periodicals，Inc. [参考：18]

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