Abstract The present study deals with the effect of molecular weight of carrier fluid on the rheological behaviour of shear thickening fluid (STF) and impact energy absorption by treated p-aramid fabrics. High molecular weight polyethylene glycols (HMW-PEG: 1000, 3000 and 6000 g mol−1) were individually added to a mixture of PEG 200 and PEG 600 to prepare ternary mixtures of carrier fluids. Increase in average molecular weight of the carrier fluid via addition of PEG 1000 and PEG 3000 enhanced the dilatant behaviour of STF. On the other hand, addition of PEG 6000 led to a rheological response inferior to that obtained via addition of PEG 3000 owing to solidification of the former at room temperature resulting in fusion of silica particles. However, an inverse relation was observed between the rheological behaviour of HMW-PEG based STFs and impact resistance of p-aramid fabrics treated with them. The diminution in impact energy absorption occurred due to lubrication effect caused by long polymer chains of HMW-PEG. On the other hand, fusion of solidified PEG 6000 and silica particles created rough microstructures over the yarn surface, which enhanced inter-yarn friction, resulting in improved impact energy absorption.

中文翻译：

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通过载液分子量的变化调节剪切增稠液的流变响应及其与处理过的对位芳纶织物抗冲击性的相关性

摘要 本研究涉及载液的分子量对剪切增稠液 (STF) 的流变行为和处理后的对位芳纶织物的冲击能量吸收的影响。将高分子量聚乙二醇（HMW-PEG：1000、3000 和 6000 g mol-1）单独添加到 PEG 200 和 PEG 600 的混合物中以制备载液的三元混合物。通过添加 PEG 1000 和 PEG 3000 增加载体流体的平均分子量增强了 STF 的膨胀行为。另一方面，PEG 6000 的添加导致流变响应低于通过添加 PEG 3000 获得的流变响应，因为前者在室温下固化导致二氧化硅颗粒融合。然而，观察到基于 HMW-PEG 的 STF 的流变行为与用它们处理的对芳纶织物的抗冲击性之间存在反比关系。由于 HMW-PEG 的长聚合物链引起的润滑作用，导致冲击能量吸收减少。另一方面，固化的 PEG 6000 和二氧化硅颗粒的融合在纱线表面产生了粗糙的微观结构，从而增强了纱线间的摩擦，从而改善了冲击能量吸收。