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首页> 外文会议>International Conference on Surface and Colloid Science; 200309; Brazil >Role of polymeric dispersant functional groups in the dispersion behaviour of titania pigment particles
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Role of polymeric dispersant functional groups in the dispersion behaviour of titania pigment particles

机译：聚合物分散剂官能团在二氧化钛颜料颗粒分散行为中的作用

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摘要

The adsorption of polymeric dispersants onto titania pigment particles has been investigated at pH 9.5 as a function of the type of polymer functional group, using polyacrylic acid and modified poly-aerylamides. The polyaerylamides include homopolymer and copoly-mers with either hydroxyl groups or carboxylate and hydroxyl groups. The experimental methods used were adsorption isotherm, zeta potential, particle size measurements and rhe-ology. The anionic dispersants increased the magnitude of the titania pigment particle zeta potential, while the nonionic dispersants had a negligible effect. Both polyacrylic acid and polyacrylamide copolymers altered the titania pigment dispersion behaviour, reducing the suspension yield stress and the mean pigment particle size, while the polyacryl- amide homopolymer had a negligible effect on the pigment dispersion properties. Generally the optimum dispersion effect (minimum particle yield stress and particle size) coincided with the polymer adsorption density; however, for polyacrylic acid, the maximum dispersion effect occurred prior to maximum adsorption. Acrylamide polymer functional groups adsorbed onto the pigment surface but they were unable to influence the pigment particle dispersion properties; however, adsorption and dispersion properties were enhanced in the presence of hydroxyl groups.
机译：已经研究了使用聚丙烯酸和改性聚丙烯酰胺在pH 9.5下聚合物分散剂在二氧化钛颜料颗粒上的吸附与聚合物官能团类型的关系。聚丙烯酰胺包括具有羟基或羧酸根和羟基的均聚物和共聚体。使用的实验方法是吸附等温线，ζ电位，粒度测量和流变学。阴离子分散剂增加了二氧化钛颜料颗粒zeta电位的大小，而非离子分散剂的作用可忽略不计。聚丙烯酸酯和聚丙烯酰胺共聚物均改变了二氧化钛颜料的分散性能，降低了悬浮液屈服应力和平均颜料粒径，而聚丙烯酰胺均聚物对颜料分散性能的影响可忽略不计。通常，最佳的分散效果（最小的颗粒屈服应力和颗粒尺寸）与聚合物的吸附密度相吻合。但是，对于聚丙烯酸，最大的分散作用发生在最大吸附之前。丙烯酰胺聚合物官能团吸附在颜料表面上，但它们不能影响颜料颗粒的分散性能。然而，在羟基存在下，吸附和分散性能得到增强。

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