环氧共混树脂的光固化及其表面化学反应

研究了双酚A型环氧树脂与有机硅环氧树脂紫外光辐照共混改性的工艺条件,并采用扫描电镜和X射线光电子能谱等分析手段对树脂改性效果和表面的物理和化学变化进行了研究.结果表明,采用二苯基碘鎓六氟磷酸盐为光引发剂,当质量分数为5％时,随着E-44含量的增加,共混树脂体系的光固化速度加快.当两者质量比为1∶ 2时,经15min的紫外光辐照后,共混树脂体系的凝胶率可达93％.X射线光电子能谱分析结果表明,在光固化的同时,试样的表面被紫外光辐照时产生的臭氧和原子氧部分氧化,转化为一层含C的氧化硅(SiO _{x )膜.}

UV treatment of blended epoxy resin and its surface chemical reaction

The cationic ultraviolet (UV) curing blends of bisphenol A epoxy resin E-44 and silicone-epoxy resin ES-06 were investigated． The UV-curing condition was explored to optimize blended resin formulation． The variations of physical and chemical properties of UV-cured sample surfaces were investigated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results indicate that the photocuring rate of the blended resins is promoted with the increase of E-44 mass fraction in the presence of 5% of a diaryliodonium salt photoinitiator． The gel conversion of a 1∶ 2 mass ratio blend of ES-06 and E-44 reaches 93% after 15-min of UV irradiation. Based on XPS data, it is found that the UV-cured sample surface has been incompletely oxidized by the ozone and atomic oxygen produced by UV radiation from atmospheric oxygen． It may be proposed that the UV-cured materials produce a SiO _{x film containing carbon atom at the surface of the sample．}