椰油酰胺丙基甜菜碱改性粘土/丁腈橡胶纳米复合材料的结构与性能

Structure and Property of NBR Nanocomposites Filled with Cocamidopropyl Betaine Modified Organoclays

采用椰油酰胺丙基甜菜碱(CAB)对粘土进行改性,制备改性粘土/丁腈橡胶(NBR)纳米复合材料,并对其结构与性能进行研究。结果表明:改性后的粘土层间距增大,NBR与改性粘土形成了有序插层型纳米复合材料,不同种类的有机粘土在橡胶基体中均达到纳米分散;随着CAB用量的增大,改性粘土在橡胶基体中的分散变好,填料网络结构增强,复合材料的硬度、拉伸强度、拉断伸长率、撕裂强度增大,定伸应力变化不大;与有机粘土I.30P和I.44P相比,当粘土阳离子交换容量与CAB的摩尔比为1∶5时,改性粘土对NBR的补强效果最佳。

In this study,clay was modified by cocamidopropyl betaine（CAB）,and modified clays/NBR nanocomposites were prepared.The structure and properties of the nanocomposites were investigated.The results showed that,the interlayer spacing of clay increased after modification,the molecular chains of NBR were intercalated into the gallery space of clay,and the organic clay was dispersed in rubber matrix at nano-scale.As the addition level of CAB increased,the dispersion of clay was improved,the filler network of the composite enhanced,the hardness,tensile strength,elongation at break and tear strength of the composites increased,and the modulus changed little.When the mole ratio of cation exchange capacity of organic clay to CAB was 1∶5,the reinforcement effect of modified clay on NBR was the best,and better than that of organoclay I.30 P and I.44 P.