白炭黑对聚硼硅氧烷流变性能的影响

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中图分类号：TB333 文献标志码：A 文章编号：1671-8755（2025）03-0043-06

Abstract：Polyborosiloxane（PBS） exhibits unique shear-thickening behavior due to the dynamic crosslinking characteristics of B-O bonds in its molecular structure，offering significant potential in the field of human safety protection. PBS was synthesized using boric acid （BA）and hydroxyl-terminated polydimethylsiloxane（PDMS-OH） as raw materials. Fumed silica （F-SiO2 ）and precipitated silica （2 （P-SiO2 ）were employed as reinforcing fillers to enhance the rheological properties and impact resistance of PBS，and their reinforcement mechanisms were analyzed. The results indicate that compared to P-SiO2 ， F-SiO2 demonstrates a more pronounced reinforcing effect. When the mass fraction of F-SiO2 added is 6% ，PBS exhibits the best performance and can increase the maximum storage modulus by 374% .The mechanism by which fumed silica enhances the rheological properties and impact resistance of PBS is that under high strain rates，fumed silica aggregates to form particle clusters，limiting the movement of PBS molecular chains and thereby enhancing the modulus of the material. The research findings can provide reference for the development of PBS protective materials.

Keywords： Polyborosiloxane；Fumed silica；Shear thickening property；Rheological property

聚硼硅氧烷（Polyborosiloxane，PBS）由于其分子结构中 B-O 键的动态交联作用，使其在高应变率下具有独特的剪切增稠特性。（剩余8277字）