中文摘要：

用甲苯-2,4-二异氰酸酯（TDI）改性磷系蒙脱土（PMMT）,并用二次改性的PMMT改性聚对苯二甲酸乙二醇酯（PET）.分析改性后的复合材料,结果表明TDI与蒙脱土表面有化学键形成,并且由于TDI的包埋,蒙脱土层间距从3.62 nm下降到3.25 nm.在原位反应中表层高活性的终端氰酸酯基能提高PMMT和PET之间的相容性,并且使得蒙脱土在聚合物基体中均匀分散.同时,层间的对苯二甲酸（PTA）与乙二醇（EG）反应所产生的聚合热能够使粘土层扩张.二次改性后的蒙脱土赋予复合材料更好的力学性能,拉伸强度提高38％以上,弯曲强度、弯曲模量都提高40％以上,但断裂伸长率有所下降.

英文摘要：

Toluene-2,4-diisocyanate （TDI） was used to modify phosphorus-montmorillonite （PMMT） and the prepared TDI-PMMT was used to prepare the composites of PET and TDI-PMMT. The analyses show that TDI and the surface of montmorillonite form chemical bonds, and the spacing of montmorillonite layer decreases from 3.62 nm to 3.25 nm. Highly active terminal isocyanate groups in situ polymerization for the montmorillonite and smart mate- rials will improve the compatibility of the PMMT and PET, and make the montmorillonite well dispersed in polymer. Meanwhile, the heat of reaction of PTA with EG in layer expand the interlayer spacing. Composites with secondary modified montmorillonite exhibits better mechanical property, as tensile strength increases by more than 38~, ben- ding strength and bending modulus increase by more than 40%, but the elongation decreases.