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在恒定剪切速率下,利用旋转流变仪研究端羧基聚丁二烯/蒙脱土纳米复合凝胶的流变行为,同时利用X-射线衍射(XRD)和透射电镜(TEM)等表征手段研究其微观结构.研究结果表明,该体系在26～116℃的升-降温过程中,观察到不可逆转变和可逆转变两种流变行为,其中不可逆转变流变行为归因于蒙脱土片层的剥离过程,而可逆转变流变行为归因于已剥离蒙脱土片层的取向-去取向过程.通过对此类纳米复合凝胶流变行为的测试,实现蒙脱土片层在端羧基聚丁二烯基体中分散过程的原位观测,并总结出影响该复合凝胶流变行为的三大因素:温度效应、剪切诱导取向效应和聚合物与蒙脱土之间的相互作用,最后提出一个机理来理解有机蒙脱土对端羧基聚丁二烯凝胶流变行为的影响,以及液体橡胶/有机蒙脱土纳米复合凝胶的独特流变行为与微观结构之间的关系.
At constant shear rate, rheological behavior of carboxyl-terminated polybutadiene / montmorillonite nanocomposite gels was investigated by means of a rotational rheometer. X-ray diffraction (XRD) and transmission electron microscopy (TEM) The microstructure was studied.The results show that the rheological behavior of irreversible and reversible transformation was observed during the ascending-descending temperature from 26 ℃ to 116 ℃. The irreversible rheological behavior was attributed to the montmorillonite layer , And the reversible rheological behavior is attributed to the orientation-de-orientation process of the stripped montmorillonite.Through testing the rheological behavior of the nanocomposite gel, Polybutadiene matrix dispersion process in situ observations and summarizes the three factors that affect the rheological behavior of the composite gel: temperature effect, shear-induced orientation effect and the interaction between polymer and montmorillonite, Finally, a mechanism was proposed to understand the effect of organo-montmorillonite on the rheological behavior of carboxyl terminal carboxyl polybutadiene gel and the relationship between the rheological behavior and the microstructure of the liquid rubber / organo-montmorillonite nanocomposite gel.