在SiO_2填充环氧复合材料中,有界面层存在,并具有一定的厚度。当SiO_2经过硅烷处理剂处理后,填充环氧树脂所形成的复合材料界面层在结构和组成上与前者是不一样的。FT-IR证明后者的界面层中有处理剂存在,且处理剂在两主要相之间形成了偶联键。界面层的结构和组成的这种变化,对复合材料的热机性能有很大影响。如偶联键形成,引起复合材料的Tg上升,热膨胀系数下降。 In the SiO 2 filled epoxy composites, there is an interface layer, and has a certain thickness. When SiO 2 is treated by silane, the interface layer of composite material filled with epoxy resin is different in structure and composition from the former. FT-IR proved that there was a treating agent in the interface layer of the latter, and the treating agent formed a coupling bond between the two major phases. This change in the structure and composition of the interfacial layer greatly affects the thermal performance of the composite. Such as the formation of coupling bond, causing the composite material Tg increases, the thermal expansion coefficient decreased.