Study on the shear thickening mechanism of multifunctional shear thickening gel and its energy dissipation under impact load
Study on the shear thickening mechanism of multifunctional shear thickening gel and its energy dissipation under impact load
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DOI：
10.1016/j.polymer.2022.124800
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发表时间：
2022-04
期刊：
影响因子：
4.6
通讯作者：
Bing Liu;C. Du;Huaxia Deng;Yankai Fu;Fei Guo;L. Song;X. Gong
中科院分区：
文献类型：
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作者：
Bing Liu;C. Du;Huaxia Deng;Yankai Fu;Fei Guo;L. Song;X. Gong
将羰基铁粉分散于剪切增硬聚合物基体中，制备了兼具剪切增稠性能和磁流变效应的多功能剪切增稠凝胶（MSTG）。当焦硼酸与聚二甲基硅氧烷的质量比从0变化到0.6时，MSTG的相对剪切增稠效果先增加后减小，在0.2-0.4的比例之间表现出优异的剪切增稠性能。提出了交联键的分子链模型来解释剪切增稠机理，并通过不同配比的MSTG的冲击试验进行了验证。据信，由于MSTG的刺激响应性能，在较高的外部冲击速度下形成更多的交联键。
A multifunctional shear thickening gel (MSTG) with both shear thickening performance and magnetorheological effect was prepared by dispersing the carbonyl iron powder into shear stiffening polymer matrix. Upon varying the mass ratio of pyroboric acid to polydimethylsiloxane from 0 to 0.6, the relative shear thickening effect of MSTG first increases and then decreases, demonstrating an excellent shear thickening property between the ratio within 0.2–0.4. A molecular chain model of the cross-linked bond was proposed to illustrate the shear thickening mechanism, and verified by the impact test of MSTG with different proportions. It is believed that more cross-linked bonds were formed at a higher external impact velocity due to the stimuli-response performance of MSTG.