Thickening effect of dispersions of ethyl acrylate-methacrylic acid copolymer prepared by different polymerization routes
Thickening effect of dispersions of ethyl acrylate-methacrylic acid copolymer prepared by different polymerization routes
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不同聚合路线制备的丙烯酸乙酯-甲基丙烯酸共聚物分散体的增稠效果
DOI：
10.1007/bf00652345
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发表时间：
1995
影响因子：
2.4
通讯作者：
J. Šnupárek
中科院分区：
文献类型：
--
作者：
P. Bradna;P. Štern;O. Quadrat;J. Šnupárek
通过丙烯酸乙酯-甲基丙烯酸共聚物（15重量%）的模型分散体增稠胶乳（粒径105、157和221 nm的酸）的非种子和种子连续乳液共聚制备。使用粘度计和动态和稳态剪切测量，我们发现，分散体的增稠效果强烈依赖于它们的颗粒结构和系统中的组分之间的相互作用的强度。在弱相互作用系统（较低的胶乳浓度，大胶乳颗粒）的分散体的增稠效果是由溶胀颗粒的有效体积分数控制。这导致通过非接种方法获得的更多溶胀（较少交联）颗粒增稠的体系的更高粘度。另一方面，在强相互作用系统（高胶乳浓度，小胶乳颗粒）中，通过接种方法制备的更交联的颗粒的较低变形性导致通过该分散体增稠的系统的较高流动阻力。
Thickening of latices (particle diameters 105, 157 and 221 nm) by model dispersions of ethyl acrylate-methacrylic acid copolymer (15 wt.% of the acid) prepared by both non-seeded and seeded semicontinuous emulsion copolymerizations was investigated. Using viscometry and dynamic and steady shear measurements, we found that the thickening effect of the dispersions strongly depends on their particle structure and the intensity of interactions between the components in the system. In weakly interacting systems (lower latex concentrations, large latex particles) the thickening effect of the dispersions is controlled by effective volume fraction of swollen particles. This leads to a higher viscosity of systems thickened by more swollen (less crosslinked) particles obtained by the non-seeded process. On the other hand, in strongly interacting systems (high latex concentrations, small latex particles) lower deformability of more crosslinked particles prepared by the seeded process causes a higher flow resistance of the systems thickened by this dispersion.