乙烯基硅烷对EVM/ATH复合材料性能的影响

Effect of vinylsilane on properties of ethylene-vinyl acetate rubber/aluminum hydroxide composites

研究了硅烷种类和用量对乙烯-乙酸乙烯酯共聚物/氢氧化铝(EVM/ATH)复合材料硫化特性、动态力学性能、动态热机械性能、物理机械性能等方面的影响。结果表明,当VTMO硅烷用量为1份时,混炼胶的门尼黏度、最低扭矩、最高扭矩、扭矩差、焦烧时间、正硫化时间较低。硅烷用量相同时,加入乙烯基三甲氧基硅烷(VTEO)的混炼胶的结合胶含量较高,混炼胶的储能模量、损耗模量较高;当应变低于10%时,VTMO硅烷用量的变化对混炼胶储能模量、损坏模量的影响较大。加入VTMO硅烷的硫化胶的储能模量最大。硅烷的加入使硫化胶的玻璃化转变温度略微向高温方向移动,加入VTEO硅烷的硫化胶损耗因子峰值最低。当VTMO硅烷用量为1份时,硫化胶的物理机械性能较为优异,硫化胶的耐磨性与混炼胶中的结合胶含量有一致性。

The effects of silane type and dosage on the vulcanization characteristics,dynamic mechanical properties,dynamic thermo-mechanical properties,and mechanical properties of EVM/ATH composites were investigated.It was found that moony viscosity,minimum torque,maximum torque,scorch time,and optimum vulcanization time of the compounds were much lower when VTMO silane was 1 phr.The bound rubber content was higher when VTEO silane was added.The storage modulus and loss modulus of the compounds with the addition of VTEO silane were much higher.When the strain was lower than 10%,the increasement of VTMO silane had a great effect on the storage modulus and loss modulus of the compounds.The storage modulus of the vulcanized rubber with the addition of VTMO silane was largest.The glass transition temperature of the vulcanized rubber moved slightly to the high temperature with the addition of silane,and the loss factor of the vulcanized rubber with the addition of VTEO silane was the lowest.The mechanical properties of the vulcanized rubber behaved excellent when VTMO silane was 1 phr,while the abrasion resistance of the vulcanized rubber was related with the content of the bound rubber in the compounds.