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The Role of Adsorption Energy in the Sulfate-Polycarboxylate Competition

机译:吸附能在硫酸盐-多羧酸盐竞争中的作用

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The interaction between sulfates and polycarboxylate polymers has become a subject of much discussion and occasional concern over the past years. Laboratory studies have shown that sulfates may prevent some polycarboxylate polymers from adsorbing, which causes a reduction in flow properties of cementitious materials. This seems to have led to the belief that this phenomenon is generally true for all polycarboxylates. In fact, it depends very much on the detailed polymer structure. Examples of this will be shown both with flow examples on paste, and experiments by atomic forces microscopy that illustrate in a very convincing way that this competition does not always turn to the advantage of sulfate ions. Furthermore, it is discussed how the outcome of this competition is governed by variations in the adsorption energy of the polymers.
机译:在过去的几年中,硫酸盐和聚羧酸盐聚合物之间的相互作用已成为许多讨论的主题,偶尔也引起关注。实验室研究表明,硫酸盐可能会阻止某些多羧酸盐聚合物的吸附,从而导致胶结材料的流动性降低。这似乎导致人们相信,这种现象通常适用于所有多羧酸盐。实际上,这在很大程度上取决于详细的聚合物结构。这方面的示例将通过粘贴上的流动示例以及原子力显微镜的实验进行展示,这些实验以非常有说服力的方式说明了这种竞争并不总是会转化为硫酸根离子的优势。此外,讨论了该竞争的结果如何通过聚合物吸附能的变化来控制。

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