淀粉黄原酸盐对炭黑/天然橡胶复合材料的结构及动态性能的影响

Effect of Starch Xanthates on Structure and Dynamic Properties of Carbon Black/Natural Rubber Composites

通过扫描电镜(SEM)、橡胶加工分析仪(RPA)及动态机械分析仪(DMA)对淀粉黄原酸盐/炭黑/天然橡胶(NR)复合材料的微观结构及动态性能进行研究。结果表明,淀粉黄原酸盐加入后,有效地改善了填料或配合剂与橡胶基体之间的界面结合力,使复合材料的抗湿滑性、滚动阻力和滞后性提高,松弛活化能降低,玻璃化转变温度向高温方向移动;在应变作用下,混炼胶的Payne效应显著,损耗因子(tanδ)增大,而随频率的变化规律则相反,且当淀粉黄原酸盐含量为6份时混炼胶的弹性模量(G')最大。

The structure and dynamic properties of the starch xanthate/carbon black/natural rubber composites were analyzed by using scanning electronic microscopy( SEM),rubber process analyzer( RPA) and dynamic mechanical analyzer( DMA). The results showed that the interface bonding force of the composites when loaded with starch xanthates was improved effectively between filler or rubber ingredients and rubber matrix. The DMA results showed that the composites increased slightly their glass transition temperature,wet skid resistance,and rolling resistance and decreased their heat build-up and relaxation activation energy. Under strain,the compounds with different parts of starch xanthates increased slightly their Payne effect and dielectric power factor( tanδ) but had opposite results as frequency decreased,and the G' of the compound was best when the compound was filled with 6 parts of the starch xanthates.