Applications of nano-silica in polymers were introduced. Properties of polymer/nano-silica composites such as microstructrue, crystallization behavior, mechanical properties, thermal properties and flame retardancy were reviewed.%介绍了纳米二氧化硅（SiO2）在聚合物中的应用情况，阐述了不同聚合物（包括聚丙烯、聚乙烯、聚氯乙烯、聚甲基丙烯酸甲酯、聚对苯二甲酸乙二醇酯）添加SiO2后，其微观结构、结晶行为、力学性能、热性能、阻燃性能等的变化趋势。
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