将硅溶胶用于纤维素膜的改性，采用共混方式添加后，提高了纤维素膜热稳定性，改善了其透光性。利用纤维素作为原料，采用氢氧化钠/尿素/硫脲作为溶解体系，制备了纤维素溶液。然后，将硅溶胶添加到纤维素溶液中，通过浸入凝胶法制备了一系列复合膜。采用红外光谱对其结构进行了表征，分析了纤维素和硅溶胶的特征峰。采用紫外-可见光谱仪对其透明度进行了研究结果表明，硅溶胶对纤维素膜的吸光性有较大影响，尤其是在紫外区更为明显。通过热重分析研究了复合膜的热性能，研究发现硅溶胶改性后的纤维素膜的热性能有大大提高，热分解温度和烧蚀剩余率都有较大幅度的增大。

Silica sol was introduced to cellulose by blending to improve thermal stability and meliorate light absorbency. The cellulose solution was synthesized in NaOH/urea/thiourea solution system. A series of silica sol modified cellulose composite films were prepared by the immersion precipitation method. The structures of these composite films were characterized by Fourier transform infrared spectroscopy (FTIR). A UV-visible light transmittance analyzer was used to analyze the transparency of the composite films. It was found that, silica sol had impact on the transparency, especially in the ultraviolet region. Thermal gravimetric analysis (TGA) was used to study the thermal properties of the composite film. It was found that the thermal stability of silica sol modified cellulose film was superior to that of pure cellulose film. Both of the decomposition temperature and the mass remaining rate increased significantly.