Study on the high-temperature damping properties of silicone rubber modified by boron-terminated polysiloxane,Journal of Applied Polymer Science

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Study on the high-temperature damping properties of silicone rubber modified by boron-terminated polysiloxane
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-10-21 , DOI: 10.1002/app.53262
Hongwei Cui _{1,

2} , Qian Jing ₂ , Dongwei Li ₂ , Tingting Zhuang ₂ , Yixing Gao ₂ , Xianghai Ran _{1,

2}

Affiliation

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.

中文翻译：

含硼聚硅氧烷改性硅橡胶高温阻尼性能研究

橡胶阻尼材料在现代工业系统中有着重要的应用。但它们的阻尼温度范围较低，不适用于高温工况下的阻尼需求。目前，对橡胶在高温条件下的阻尼性能的研究很少。硅橡胶具有优异的耐高温性，但在其应用温度范围内阻尼性较差。在这项研究中，通过用硼酸 (BA) 改性羟基封端的聚二甲基硅氧烷 (PDMS-OH) 来制备硼封端的聚硅氧烷 (PBS)。PBS的分子结构通过傅里叶变换红外光谱（FTIR）、核磁共振（NMR）和凝胶渗透色谱（GPC）分析得到证实。流变学测量显示 PBS 是一种“剪切硬化”材料。然后，硅橡胶用PBS改性。随着硼原子的引入，硅橡胶内部可形成具有动态性质的硼氧配位键，在缔合/解离过程中起到耗能作用。动态机械分析 (DMA) 表明损耗因子 (tan改性硅橡胶的δ )在81.5℃~250℃温度范围内大于0.3，高于常规阻尼橡胶的损失温度范围。循环应力-应变试验也表明，改性硅橡胶在高温下仍具有较高的耗散系数（DE）。因此，该方法制备的PBS改性硅橡胶在高温条件下具有优异的阻尼性能。

更新日期：2022-10-21

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