超细金刚石与树脂基体间界面层的研究

Structure and Properties of Boundary Layer Between Nanodiamond and Resin Matrix

为观察和分析复合树脂中超细金刚石填料与基体间界面层的结构及其作用机理,合成了仅添加改性超细金刚石为增强体的复合树脂,对该树脂进行了机械性能测试、透射电镜观察以及红外光谱等测试.结果表明超细金刚石的加入可以明显提高树脂的机械性能,并观察到纳米金刚石颗粒与基体之间存在着界面层.在光照固化以后,界面层中的双键在光引发剂的催化下随机地与其附近的其他分子上的双键发生反应,DND与基体之间由氢键、分子间作用力等较弱的结合方式变成通过化学键连接的牢固的结合方式,使得树脂抵抗外界载荷的能力获得了极大提高.

To analyze the structure and reinforcing mechanism of boundary layer between nanodiamond and resin matrix, composite resins contained DND （detonation nanodiamond, modified） were synthesized. Properties of resins were investigated by measures of electronic universal testing machine, SEM and FT-IR. The structure and characters of the boundary layer were analyzed and its reinforcing mechanism was explained. Results show that, with the added DND, the mechanical properties of resins is improved, and the boundary layer between DND particle and matrix could be observed. After light-curing, the double bonds in boundary layer were catalyzed and then combined randomly with double bonds of other molecules nearby. Combination between DND and resin matrix changed from week combination, such as hydrogen bonds or intermolecular force, to firm chemical bonds. These changes made resin resistance to load improve greatly.