聚丙烯/蒙脱土纳米复合材料的结构与性能

Effect of compound organification of montmorillonite on the structure and properties of polypropylene/montmorillonite nanocomposites

采用复合季胺盐制备反应性有机蒙脱土并参与三单体固相接枝聚合,加强蒙脱土(MMT)的熔融插层和稳定 MMT 的插层结构,制备剥离型的聚丙烯/蒙脱土纳米复合材料(PPMN)．通过 X 射线衍射(XRD)、傅立叶变换红外光谱(FTIR)．透射电镜(TEM)等测试手段研究了 PPMN 的结构和性能．结果表明：复合有机化和固相接枝的确加强了 MMT 的熔融插层．MMT 的复合有机化和固相接枝的放热过程有助于 MMT 层间涨大和 MMT 剥离结构的形成．当 PPGM 的添加量在 6～8phr 时,PPMN 的力学性能、流动性能和热性能达到一个较好的增强状态．PPMN 力学性能和热性能的提高归功于剥离的蒙脱土的增强作用和接枝低聚物原位形成的界面增容作用；PPMN 流动性能的改善来源于剥离的蒙脱土和固相接枝形成的低聚物的增塑作用．

Reactive organophilic montmorillonite, prepared with compound alkylammoniums, took part in the ternary-monomer solid phase graft copolymerization in order to enchance the melting intercalation of montmorillonite（MMT）, stabilize the intercalated structure, and prepare the exfoliated PP/MMT nanocomposites（PPMN）. The structure and properities of PPMN were studied by XRD, FTIR, TEM etc. Results show that the compound organification, solid phase graft copolymerization really promoted the melting intercalation. The compound organification and the exothermic process of solid phase copolymerization favored the melting intercalation. The mechanical properties, the melt flow rate and the Vicat soft point of PPMN had a preferable state at 6-8 phr PPGM. The increase of the mechanical properties and thermal properties was owed to the reinforement of the exfoliated MMT and the compatibilization of oligomers built by polar monomers during the solid phase graft copolymerization. The improvement of the fluidity of PPMN derived from the plastification of the exfoliated MMT and the oligomers.