动态扭振法研究聚甲基丙烯酸甲酯/蒙脱土纳米复合材料的本体插层聚合

用动态扭振法研究热塑性塑料聚甲基丙烯酸甲酯(PMMA)/蒙脱土(MMT)复合体系的本体插层聚合.并试用处理交联体系固化的Flory理论、非平衡态热力学涨落理论和Avrami方程研究PMMA/MMT复合体系的本体插层聚合,求取表观活化能Ea.实验发现,PMMA/MMT插层聚合转化率曲线中后期与热固性树脂的固化曲线极为类似,表明剥离后的蒙脱土片层在复合材料中起到交联点的作用.

Studies on Bulk Intercalation Polymerization of PMMA/Montmorillonite Intercalated Nanocomposite by Dynamic Torsion Vibration Method

The intercalation and dynamic mechanics behavior of PMMA in organ clay have been investigated by the dynamic torsional vibration methods. With the mechanical methods the cure process can be studied successfully. The Flory′s gelation theory and non-equilibrium thermodynamic fluctuation theory were used to predict the gel time t_g and the cure behavior of PMMA/organo-montmorillonite intercalated nanocomposites at various temperatures and Org-MMT loadings. The theoretical prediction is in good agreement with the experimental results obtained by so-called dynamic torsional vibration method, and the results show that the addition of Org-MMT increases the gel time t_g and reduces the rate of curing reaction. The last stage of polymerization of the PMMA in Org-MMT is similar to the cure process of the thermosetting resin and that implies the crosslinkings form. We can estimate the apparent curing activation energy and study the change of the mechanical behavior of the resin system corresponds to the change of the Org-MMT content. The addition of Org-MMT(MMT/MMA<5%) has no apparent effect on the apparent activation energy of the cure reaction.