丁腈橡胶/酚醛树脂/受阻酚AO80阻尼橡胶贮存稳定性研究

Storage Stability of Vulcanized Acrylonitrile-Butadiene/Phenolic Resin/Hindered Phenol AO80 Damping Rubber

在丁腈橡胶(NBR)中添加酚醛树脂(PR)和受阻酚AO80,制备共混橡胶,采用示差扫描量热(DSC),傅立叶红外光谱(FTIR),扫描电子显微镜(SEM)和粘弹谱仪(DMTA)等方法表征其结构,研究其阻尼机理。研究结果表明:在共混橡胶中,除NBR硫化交联网络外,还包含NBR/AO80的超分子氢键网络、NBR/PR的络合作用、AO80与PR分子间作用、AO80分子聚集体及在AO80相中的NBR分子等多种微观作用形式。复杂的分子作用形式使硫化胶分子间摩擦增大,提高了阻尼性能。但随贮存时间延长,AO80聚集结晶,造成硫化橡胶阻尼性能的不稳定。

3,9-bis[1,1-dimethyl-2{β-（3-tertbutyl-4-hydroxy-5-methylphenyl）propionyloxy}ethyl]-2,4,8,10-tetraoxaspiro-undecane（AO80） and the phenolic resin（PR） were added into the acrylonitrile-butadiene rubber（NBR） to prepare the vulcanized NBR/PR/ hindered phenol rubber.The structure of the vulcanized rubber was characterized by DSC,FTIR,DMTA and SEM.And its damping and mechanical mechanism was investigated in detail.The results show that the microscopic structure of vulcanized rubber include the networks of intermolecular hydrogen bonds between NBR and AO80 molecules,the nonbonding complexation of PR in NBR,the molecular aggregation of AO80（AO80 rich phase） and NBR segments incorporated into the AO80 molecular aggregations besides the vulcanized networks of NBR.These complex molecular interactions lead to the increase of internal friction,and thus vulcanized rubber obtain good damping properties.However,with the increasing of deposited time,the AO80 aggregates and crystallines in the rubber,which affects the stability of damping properties of the rubber.