【摘要】 用动态扭振法研究不饱和聚酯/有机蒙脱土复合材料的固化动力学行为。结果表明该实验体系能够很好地应用Flory理论和Avami方程进行拟合。用非平衡态热力学涨落理论对纳米复合材料的固化作了理论预估,预估结果与实验固化曲线有很好的相符性。有机蒙脱土的加入降低了不饱和聚酯的固化反应速率,对固化反应表现活化能和复合材料的形成过程没有很大的影响。根据实验结果分析不饱和聚酯在有机蒙脱土存在下的固化分为定型和熟化两个阶段。在一定的固化温度和填充含量下,从动态扭振曲线上可以明显地观察到这种“二次固化”现象。更多还原

【Abstract】 The Flory’s gelation theory, non-equilibrium thermodynamic fluctuation theory and Avrami equation were used to predict the gel time t_g and the cure behavior d epoxy resin/organo-montmorillonite/MEKP/Co intercalated nanocomposites at various temperatures and Org-MMT loadings. The theoretical prediction is in good agreement with the experimental results obtained by dynamic torsional vibration method. The results show that the addition of Org-MMT increases the gel time t_g and decreases the rate of curing reaction, the value of K_p , but has no apparent effect on the apparent activation energy of the curing system and on the curing process of nanocomposites. Plus, with the existence of nanocomposites, the curing process of UP fails into two steps: outlayer curing and interlayer catalyzed curing. In most of the cases, twi-curing were observed from the dynamic torsional vibration curves.更多还原