氯化丁基橡胶/聚丙烯酸酯阻尼橡胶的力学性能

Mechanical properties of chlorinated butyl rubber/polyacrylate damping rubber

采用聚丙烯酸酯 (PA)为第二组分 ,与氯化丁基橡胶 (CIIR)制备了CIIR/PA阻尼橡胶。分析了CIIR/PA共混物的结构 ,讨论了原料组成、交联剂用量和填料种类对其力学性能的影响。结果表明 ,CIIR/聚 (丙烯酸乙酯 -甲基丙烯酸丁酯 ) [P(EA -BMA) ]共混物的正硫化时间为 10min ,CIIR/聚丙烯酸乙酯 (PEA)硫化共混物中存在共交联结构 ;共交联CIIR/PEA共混物形成了双相连续的微观相态结构 ;当P(EA -BMA)中PBMA链段的质量分数增加到 2 0 %时 ,共交联CIIR/P(EA -BMA)共混物的拉伸强度和 10 0 %定伸应力下降 ,当P(EA -BMA)中PBMA链段的质量分数继续增加 ,共混物的拉伸强度和 10 0 %定伸应力又逐渐上升。当酚醛树脂 (PR)用量不大于 2 0份时 ,随着PR用量的增加 ,共交联CIIR/PEA共混物的 10 0 %定伸应力和邵尔A型硬度增大 ,拉伸强度和扯断伸长率减小 ;当PR用量为30份时 ,共混物的 10 0 %定伸应力减小 ,拉伸强度增大 ;填料中以炭黑的增强效果最好 ,玻璃微球增强效果最差。

A series of chlorinated butyl rubber (CIIR)/ polyacrylate (PA) damping rubber were prepared with PA as the second composition of the blends.The structures of the resulting blends were characterized and the influence of the blending compounding ratio, crosslinking agent content as well as the type of the fillers on the mechanical properties of the CIIR/PA blends were discussed.The results showed that the time when the cocure CIIR/P(EA-BMA) blends generated optimum cure was 10 min in the system, some co-crosslinking structures were evidenced existing in the CIIR/PEA blends and a dual phases continuity were observed in the aggregation of the blends.The tensile strength and modulus at 100% of the cocured blends decreased when the mass ratio of PBMA segments reached 20%, while it increased gradually with the ratio of PBMA segments increaseing continuously. By raising the PR content, the modulus at 100% and the Shore A hardness of the cocure CIIR/P(EA-BMA) blends increased, but the tensile strength and elongation at break had a drop, when the PR content increased to 30%, the modulus at 100% decreased while the tensile strength increased.By contrast, black carbon had good filling effect to the blends, whereas the effect filled glass microspheres was the worst.