中文摘要：

对纳米SiO2和TiO2进行TTDI（HDI）和PEG的接枝改性，并采用共混法制备了纳米改性水性聚氨酯乳液，电镜观测表明改性后的纳米粒子在乳液中分散均匀，无团聚现象。纳米粒子改性后的水性聚氨酯乳液力学性能比未改性前得到改善和提高，纳米粒子添加量为0．5％时，水性聚氨酯乳液的力学性能最佳，同时吸水率降低了70％，添加的纳米粒子对290～400nm的紫外光有吸收。

英文摘要：

Nano - SiO2 and nano - TiO2 were respectively modified by TDI （HDI） and PEG. Nano - particles/waterborne polyurethane emulsion were prepared by blending method. SEM test showed that nanopartieles were well dispersed with no agglomerates. The mechanical properties were improved after modification with nanoparticles. When the contents of SiO2 and TiO2 were up to 0.5%, the waterborne polyurethane can provide the best mechanical properties, and the water absorption downed by 70%. The nanoparticles added shows ultraviolet absorbtion at the wavelength of 290 -400 nm.