热空气老化对苯基硅橡胶阻尼特性的影响  

Impact of Hot Air Aging on Damping Property of Methylphenylvinyl Silicone Rubber

作　　者：王鹏[1] 刘宛琪 苏正涛[1] 黄艳华[1] 郝敏[1] 王景鹤[1] 

机构地区：[1]北京航空材料研究院,北京100095 [2]合肥工业大学化学与化工学院,合肥230009

出　　处：《有机硅材料》2015年第4期273-277,共5页Silicone Material

基　　金：国防基础科研基金(A0520131002)

摘　　要：研究了不同老化温度（300℃、320℃、330℃、340℃、350℃）下，短时（30 min）热空气老化对苯基硅橡胶（ PS5360）硫化胶老化性能的影响。采用低场NMR橡胶交联密度测定仪研究了老化前后PS5360硫化胶的交联密度变化。测试了其在老化前后的物理力学性能变化。依据不同的应用环境，使用动态热机械分析仪分别在20℃和110℃下测量了老化后PS5360硫化胶的动态力学性能。结果表明：随着短时老化温度的提高， PS5360硫化胶在中低频（5～150 Hz）环境下的介质损耗因数逐渐提高，交联密度逐渐降低，物理力学性能逐渐下降。The short-term hot air aging properties of methylphenylvinyl silicone rubber （ PVMQ ） were studied under different short-term temperatures , such as 300℃, 320℃, 330℃, 340℃and 350℃.Frequen-cy-dependent dynamic mechanical properties of aged PVMQ were tested by dynamic mechanical thermal analy -sis （ DMTA ） at 20℃ and 110℃, respectively .Variations of crosslink density of aged vulcanized rubber PS5360 were studied by rubber cross-linking density measuring instrument （ low-dimensional NMR ） .The physical mechanical property was tested before and after aging .Dynamic thermal mechanical analyzer （ DM-TA） was used to measure the dynamic mechanical properties of aged phenyl silicone rubber at 20℃and 110℃respectively .Result indicates that with the increase of aging temperature , losing modulus and loss factor of the aged rubber increased , while its crosslinking density decreased gradually .It can also be made by the vulcan-ized rubber in process of high temperature for a short period of time , aiming at improving the damping perform-ance of phenyl silicone rubber PS 5360 in 5~150Hz, besides the partial cured in the process of high tempera-ture vulcanization .

关 键 词：苯基硅橡胶 动态机械性能 交联密度 介质损耗因数 阻尼性能 

分 类 号：TQ333.93[化学工程—橡胶工业]