研究了不同用量的沉淀法白炭黑填充质量比75/25的氯丁橡胶/天然橡胶共混物的物理机械性能、耐热老化性能和耐油性能,并用扫描电镜研究了共混物的结构.结果显示,白炭黑的加入改善了共混硫化物的拉伸强度、100%定伸应力和邵尔A硬度.压缩永久变形减小,黏度增大,从而导致在形变的过程中天然橡胶分散相占有率相对减少.相关性能也证明随着白炭黑用量的增加,硫化胶的耐热和耐油性能显著提高.%Blends of 75/25 ( mass ratio) chloroprene rubber ( CR )atural rubber ( NR ) filled with various loadings of precipitated silica were prepared, and their mechanical properties as well as the resistances to thermal aging and oil were studied. The blend morphology was also studied by scanning electron microscope. The results show that the tensile strength, modulus and Shore A hardness of the blend vulcanizates are found to be improved noticeably with increasing silica loading, the compression set is impaired with increasing silica loading. In terms of phase morphology, the size of NR dispersed phase decreases with increasing silica loading due to the increase of compound viscosity. The results also demonstrate that both thermal aging resistance and oil resistance of the blend vulcanizates, as represented by the relative properties, are remarkably enhanced with increasing silica loading.
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