材料科学
硅橡胶
复合材料
天然橡胶
大气温度范围
流变学
硅酮
聚二甲基硅氧烷
动态力学分析
硼
傅里叶变换红外光谱
化学工程
聚合物
有机化学
热力学
化学
工程类
物理
作者
Hongwei Cui,Qian Jing,Dongwei Li,Tingting Zhuang,Yixing Gao,Xianghai Ran
摘要
Rubber damping materials have important applications in modern industrial systems. However, their damping temperature range is low, which is not suitable for the damping demand under high temperature conditions. At present, there is very little research on the damping performance of rubber under high temperature conditions. Silicone rubber has excellent high temperature resistance but poor damping in its application temperature range. In this study, a boron-terminated polysiloxane (PBS) was prepared by modifying hydroxy-terminated polydimethylsiloxane (PDMS-OH) with boric acid (BA). The molecular structure of PBS was confirmed by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR) and gel permeation chromatography (GPC) analysis. Rheology measurements revealed that PBS was a “shear hardening” material. Then, the silicone rubber was modified with PBS. With the introduction of boron atoms, boron and oxygen dative bonds with dynamic properties could be formed inside the silicone rubber, which played an energy dissipation role in the process of association/dissociation. Dynamic mechanical analysis (DMA) showed that the loss factor (tan δ) of modified silicone rubber was greater than 0.3 in the temperature range of 81.5°C–250°C, which was higher than the loss temperature range of conventional damping rubber. The cyclic stress–strain test also showed that the modified silicone rubber still had high dissipation coefficient (DE) at high temperature. Therefore, the PBS-modified silicone rubber prepared by this method achieved excellent damping performance under high temperature conditions.
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