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研究了不同二乙基链节含量硅橡胶的性能,并与甲基乙烯基硅橡胶做了对比。热老化试验表明,二乙基的引入使硅橡胶的耐热老化性能明显降低;压缩耐寒系数实验表明,二乙基链节的引入可破坏硅橡胶的低温结晶,20%二乙基链节含量的硅橡胶在-100℃的压缩耐寒系数可达0.47;DMTA分析表明,当二乙基链节达到一定数量时,可破坏低温结晶,甚至使低温结晶完全消失,成为非结晶橡胶,并随二乙基链节的增加,玻璃化转变温度降低。
The properties of silicone rubber with different content of diethyl chain were studied and compared with methyl vinyl silicone rubber. Thermal aging tests showed that the introduction of diethyl led to the heat aging resistance of silicone rubber significantly reduced; compression coefficient of cold resistance experiments show that the introduction of diethyl chain can destroy the low temperature crystallization of silicone rubber, 20% diethyl chain content Of the silicone rubber compression at -100 ℃ cold hardiness coefficient of up to 0.47; DMTA analysis shows that when the number of diethyl chain reaches a certain amount, it can undermine the low-temperature crystallization, or even completely disappear at low temperature crystallization, a non-crystalline rubber, and with two With the increase of ethyl chain, the glass transition temperature is decreased.