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为了阐明含有聚氧乙烯接枝侧链的聚羧酸系超塑化剂的流动机理,文章研究了接枝共聚物的化学结构对水泥分散性能的影响。有长接枝链的共聚物表现为较好的分散能力和低的吸附量。吸附量研究表明随着吸附密度的增加接枝链被拉长。吸附在水泥颗粒表面的共聚物接枝链的厚度取决于两个接枝共聚物间的平均距离和共聚物内部接枝链的间距,还取决于共聚物的几何学特征。改进的空间稳定性模型合并了由于吸附导致接枝链的拉长和共聚物的几何学约束,给出了含有不同种接枝共聚物水泥浆吸附和流动关系的有用的解释。
In order to elucidate the flow mechanism of polycarboxylate-based superplasticizer containing polyoxyethylene grafted side chains, the effect of the chemical structure of the graft copolymer on the dispersion performance of the cement was investigated. Copolymers with long graft chains exhibit better dispersibility and lower adsorption capacity. Adsorption capacity studies show that the graft chain is elongated with increasing adsorption density. The thickness of the graft chain of the copolymer adsorbed on the surface of the cement particles depends on the average distance between the two graft copolymers and the spacing of the graft chains inside the copolymer and also on the geometric characteristics of the copolymer. The improved space stability model incorporates the geometrical constraints of the graft chain elongation and the copolymer due to adsorption, giving a useful explanation of the sorption and flow relationships of grouts containing different graft copolymers.