中文摘要：

通过溶胶-凝胶法，不使用任何催化剂，在较高的反应温度下，制备了球状的纳米SiO2，并用乙二醇对其表面接枝改性，增大了其在乙二醇中的分散性。用透射电镜和红外光谱进行了表征，并对其改性后在聚酯（PET）中的应用前景进行了探讨。

英文摘要：

The nano silica particles were prepared by sol-gel method at high temperature without any catalyst. The ethylene glycol （EG） were grafted onto the surface of silica nanoparticles, which increased the dispersibility of silica nanoparticles in EG. TEM and FTIR were used to characterize silica particles and modified silica particles. The modified silica particles could be used to prepare PET/silica nanocomposites.