添加剂的含量和分子链长对剪切增稠液性能的影响

Shear Thickening Fluids Based on Additives with Different Concentrations and Molecular Chain Lengths

将二氧化硅颗粒和不同分子链长添加剂颗粒分散到聚乙二醇分散介质中制得剪切增稠液样品，研究了添加剂的不同含量和不同分子链长对剪切增稠液流变性能的影响．对其流变特性的研究表明，随着添加剂含量的增加和分子链长的增长，样品的剪切增稠效应增强明显，并用大粒子簇的形成对增强机理给出了合理的解释．

Shear thickening fluids （STFs） based on additives with different concentrations and molecular chain lengths were investigated. STF samples were prepared with silica and additive dispersed in polyethylene glycol （PEG） 400, where three types of additives with different molecular chain lengths of PEG4000, PEG6000, and PEG10000 were used. For PEG10000, different concentrations, including 0, 1%, 3%, and 5%, were selected to study the influences of additive concentrations. Rheological properties of the samples were measured with a rheometer. The results show that the shear thickening effect was significantly enhanced with the increase of the concentration and the molecular chain length of additives. The mechanism of enhancement was quantitatively explained with the formation of large particles clusters.