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Effects of silica morphology on the shear?thickening behavior of shear thickening fluids and stabbing resistance of fabric composites

Shear?thickening fluid (STF) refers to a system where nonaggregating solid particles are suspended in a specific fluid. Due to its unique viscosity variation, STFs have attracted a lot of attention as soft body armor materials for impact protection. In this work, two kinds of STFs were designed using polyethylene glycol (PEG) and spherical or irregularly shaped silica particles. Rheological results showed that shear thickening can even occur at lower shear rates in the irregularly shaped silica?based STF; however, the thickening range of the spherical silica?based STF was broader. Meanwhile, the composites prepared with STFs and aramid fabrics exhibited better antistab properties than neat fabrics. Compared to composite prepared with irregularly shaped silica?based STF, spherical silica?based STF/aramid composite had better stabbing resistance. In addition to the binding effect of silica particles to the fiber bundle, it was considered that when the fabric composite was subjected to impact, spherical particles were easier to slide so that the STF was more likely to be thickened to achieve a greater viscosity, resulting in the better stabbing resistance performance. Our studies will provide guidance for the design of the high?performance soft body armor equipment. ? 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48809.

» Author: Rubin Wei, Bin Dong, Fenglong Wang, Jingjing Yang, Yanyan Jiang, Wen Zhai, Hui Li

» Reference: doi:10.1002/app.48809

» Publication Date: 18/12/2019

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