采用序列法制备氢化丁腈橡胶(HNBR)/聚甲基丙烯酸酯互穿聚合物网络(IPN)阻尼材料.IPN体系的红外曲线在1750～1700cm~(-1)及1190～1150cm~(-1)范围内出现了较强的特征峰,可以证明聚甲基丙烯酸酯的存在.物理机械性能表明,随着甲基丙烯酸酯的酯基体积增大,IPN的硬度、拉伸强度及100%定伸强度减小.动态性能表明HNBR与聚甲基丙烯酸酯形成的IPN体系能够拓宽HNBR的阻尼温度范围.HNBR/聚甲基丙烯酸正丁酯IPN的阻尼因子较高,适用于约束阻尼系统,而HNBR/聚甲基丙烯酸甲酯IPN具有较高的损耗模量和适宜的阻尼因子,适于自由阻尼系统.
Sequential interpenetrating polymer networks (IPNs) based on hydrogenated nitrile rubber (HNBR) and various polyalkyl methacrylates were synthesized. Infrared (IR) spectroscopy showed that there were strong absorbing peaks at 1750-1700cm~(-1)and 1190-1150cm~(-1), suggesting the successful synthesization of polyalkyl methacrylates. With increasing in bulkiness of the ester group of the acrylates the hardness, tensile strength,and 100% modulus decreased because of decreased stiffness of the acrylate phase. Dynamic mechanical thermal analysis proved that IPNs could broaden the damping peaks. HNBR/PBMA IPN had a higher tanδ indicating that it would be suitable to be used in a constrained layer damping system and HNBR/PMMA might be preferable for extensional damping system with higher modulus and reasonable tanδ.
参考文献
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