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首页> 外文期刊>Nordic Pulp & Paper Research Journal >The influence of thickeners on the surface structure of coatings evaluated by AFM and pair distribution function analysis Relationship between surface structure, colloidal stability and viscosity
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The influence of thickeners on the surface structure of coatings evaluated by AFM and pair distribution function analysis Relationship between surface structure, colloidal stability and viscosity

机译：AFM和成对分布函数分析评估增稠剂对涂料表面结构的影响表面结构，胶体稳定性和粘度之间的关系

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The surface micro structure of coating layers, drawn down from aqueous polystyrene (PS) suspensions on polyester substrates, was investigated. The effects of three different water-soluble thickeners, carboxymethyl cellulose, poly(vinyl alcohol) and an alkali-swellable emulsion, were compared. Each of the thickeners was investigated at three different concentrations. An Atomic Force Microscope was used to investigate the surface structure of the coating layers. The surface structure was interpreted by calculating the pair distribution function, g(r), where r is the radius of a ring centered at a particle. The colloidal stability of the PS suspensions was also investigated. The apparent viscosity and the aqueous phase viscosity were measured in order to elucidate the colloidal stability and degree of flocculation. The suspensions containing the alkali-swellable emulsion had the highest viscosity. The coating layers containing the alkali-swellable emulsion showed the lowest degree of order in the surface layer. Rheological investigation showed that the suspension containing the alkali-swellable emulsion possessed the most solid-like behavior in terms of long relaxation times. A pronounced liquid-like behavior promoted ordered surface structures, while the correlation between storage modulus and surface structure was less apparent. Quite a good correlation was observed between the surface micros-tructure and the amount of polymer added, despite the fact that the different thickeners destabilized the suspensions by different mechanisms. The surface microstructure seemed to be strongly affected by the concentration of water-soluble polymer in the aqueous phase of the wet coating during the course of the consolidation (drying).
机译：研究了从聚酯基材上的水性聚苯乙烯（PS）悬浮液吸取的涂层表面微观结构。比较了三种不同的水溶性增稠剂羧甲基纤维素，聚乙烯醇和碱溶胀性乳液的效果。研究了每种增稠剂的三种不同浓度。使用原子力显微镜研究涂层的表面结构。通过计算对分布函数g（r）来解释表面结构，其中r是以粒子为中心的环的半径。还研究了PS悬浮液的胶体稳定性。测量表观粘度和水相粘度以阐明胶体稳定性和絮凝度。含有碱溶胀性乳液的悬浮液具有最高的粘度。含有碱溶胀性乳液的涂层在表面层中显示出最低的有序度。流变学研究表明，就长松弛时间而言，含有碱溶胀性乳液的悬浮液具有最像固体的行为。明显的类似液体的行为促进了有序的表面结构，而储能模量与表面结构之间的相关性则不太明显。尽管不同的增稠剂通过不同的机理破坏了悬浮液的稳定性，但在表面微观结构和聚合物的添加量之间却观察到了很好的相关性。在固结（干燥）过程中，表面微观结构似乎受到湿涂层水相中水溶性聚合物浓度的强烈影响。

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