论文部分内容阅读
首次将插层纳米复合技术与互穿聚合物网络(IPN)技术相结合,通过同步插层聚合法制备了聚氨酯/聚甲基丙烯酸甲酯/有机蒙脱土(PU/PMMA/OMMT)纳米复合材料。XRD、SEM、TGA等研究表明,在聚氨酯/有机蒙脱土(PU/OMMT)体系中蒙脱土以40~700 nm的团聚体不均匀地分散在聚氨酯基体中,且部分蒙脱土被插层,其层间距增加了0.95nm,体系为插层型纳米复合材料。PU/PMMA/OMMT体系中蒙脱土以20~80nm的粒子分布于聚合物基体中,且蒙脱土的插层效果显著,是PU/OMMT体系的2.5倍,形成了插层型纳米复合材料。同时,蒙脱土的加入使得聚氨酯和聚甲基丙烯酸甲酯的互穿聚合物网络(PU/PMMA-IPN)体系中PU相与PMMA相间相分离更明显,塑性相畴粒子尺寸显著增加,且各相中两组分相互作用加强,分布更均匀。PU/PM-MA/OMMT纳米复合材料的热稳定性高于其他材料。同时对其力学性能进行了研究,发现其力学性能明显优于聚氨酯、基于聚氨酯和PU/PMMA-IPN和PU/OMMT纳米复合材料。
Polyurethane / polymethylmethacrylate / organic montmorillonite (PU / PMMA / OMMT) nanocomposites were prepared by a simultaneous intercalation polymerization method, combining intercalated nanocomposite technology with interpenetrating polymer network (IPN) material. XRD, SEM, TGA and other studies have shown that in the polyurethane / organic montmorillonite (PU / OMMT) system montmorillonite 40 ~ 700 nm aggregates dispersed in the polyurethane matrix, and part of the montmorillonite was inserted Layer, the interlayer spacing increased by 0.95nm, the system for intercalated nanocomposites. In the PU / PMMA / OMMT system, montmorillonite is distributed in the polymer matrix with 20 ~ 80nm particles, and the intercalation effect of montmorillonite is remarkable, which is 2.5 times that of the PU / OMMT system, forming an intercalated nanocomposite . At the same time, the addition of montmorillonite makes the phase separation of PU phase and PMMA phase more obvious in the interpenetrating polymer network (PU / PMMA-IPN) system of polyurethane and polymethylmethacrylate, the size of plastic phase domain particles increases significantly, and Interaction between the two components in each phase to strengthen and distribute more evenly. PU / PM-MA / OMMT nanocomposites have higher thermal stability than other materials. At the same time, its mechanical properties were studied and it was found that its mechanical properties were significantly better than polyurethane, based on polyurethane and PU / PMMA-IPN and PU / OMMT nanocomposites.