二元混杂粒径氧化铝对甲基乙烯基硅橡胶性能的影响

Effect of hybrid alumina with binary particle size distribution on properties of methyl vinyl silicone rubber

在氧化铝总体积分数为35%时,分别选取0.5,5.0,10.0μm的氧化铝小粒子和30.0μm的氧化铝大粒子按照不同体积比混合填充甲基乙烯基硅橡胶(MVQ),考察了氧化铝小粒子相对用量对MVQ性能的影响。结果表明,随着氧化铝小粒子用量的增加,MVQ的热导率先升高后下降,当0.5,5.0,10.0μm氧化铝小粒子相对体积分数分别为20%,30%,40%时,热导率达到最大值;当氧化铝小粒子相对体积分数为20%时,MVQ的介电常数降至最低值(10.0μm氧化铝填充体系除外),拉伸强度达到最大值;随着氧化铝小粒子用量的增加,MVQ的热膨胀系数下降,且5.0μm氧化铝填充体系的下降幅度最大;在MVQ基体中,氧化铝大、小粒子间具有紧密的堆积结构。

When the total volume fraction of alumina particles was 35%,the bigger alumina particles with 30 μm of particle size and the smaller alumina particles with 0.5,5.0,10.0 μm of particle sizes were employed as three different binary hybrid fillers to reinforce methyl vinyl silicone rubber(MVQ).The effects of relative volume fraction of smaller alumina particles on the properties of MVQ were investigated.The results showed that the thermal conductivities of the three filled systems first increased,then decrease...