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采用核磁共振交联密度仪、橡胶加工分析仪以及扫描电子显微镜(SEM)等仪器研究了高填充天然橡胶硫化过程中内部物理化学网络的形成以及与硫化温度的关系。结果表明,在硫化温度变化范围内,硫化胶交联密度随硫化温度的升高呈现先增大后减小趋势,在145℃时交联密度最高,物理机械性能最佳;在硫化过程中,填料会重新分散和局部聚集,填料的分散性较混炼胶的有所提高;随着硫化温度的升高,填料局部聚集程度有所增大,但填料-橡胶网络没有发生明显变化;硫化过程中形成的化学交联网络会限制填料的聚集程度。
The formation of internal physico-chemical network and the relationship with vulcanization temperature were studied by means of nuclear magnetic resonance cross-linked densitometer, rubber processing analyzer and scanning electron microscope (SEM). The results show that the cross-linking density of vulcanizates first increases and then decreases with the increase of vulcanization temperature, and the cross-link density is the highest at 145 ℃, and the physical and mechanical properties are the best. During vulcanization, The filler will re-disperse and local aggregation, filler dispersion than the rubber compound has improved; with the vulcanization temperature increases, the local aggregation of filler has increased, but the filler - rubber network did not change significantly; vulcanization process The formation of chemical cross-linked network will limit the degree of packing aggregation.