单/双苯基共混硅橡胶的阻尼性能研究

Study on Damping Properties of Mono-diphenyl Blended Silicone Rubber

采用单苯基硅橡胶与双苯基硅橡胶共混的方式制备了苯基硅橡胶阻尼材料,分别研究了组成及交联程度对共混橡胶阻尼及拉伸性能的影响。介电分析结果表明,在单苯基硅橡胶中加入质量分数20%~80%的双苯基硅橡胶时,均出现了双损耗峰,说明该体系发生了明显的相分离现象;在单/双苯基硅橡胶以80/20和60/40比例共混时,其拉伸力学性能较单苯硅橡胶略有提高;共混硅橡胶在硫化剂用量为0.5份/100份时,有效阻尼温域达到230℃,随着硫化剂用量增加,有效阻尼温域明显降低。交联程度对相分离结构影响较小,随着交联程度的增加,材料的拉伸力学性能增强,但是阻尼性能下降较为明显。

The method of blending single phenyl silicone rubber with diphenyl silicone rubber was adopted to prepare phenyl silicone rubber damping materials and the effects of composition and degree of cross-linking on the damping and tensile properties of the blended rubber were studied respectively.The results of dielectric analysis show that double-loss peaks appear when mass fraction 20%-80%of diphenyl silicone rubber is added to mono-phenyl silicone rubber,indicating that a clear phase separation phenomenon has occurred in the system.Its tensile mechanical properties are slightly better than that of single benzene silicon rubber when mono-diphenyl silicone rubber is blended in 80/20 and 60/40 ratios.The effective damping temperature domain reaches 230℃when the dosage of vulcanization agent for blended silicone rubber is 0.5/100 parts and decreases obviously as the dosage of curing agent increases.The degree of cross-linking has little effect on the phase-separated structure.The tensile properties of the material are enhanced with the increase of the cross-linking rate,but the damping performance decreases obviously.