Synthesis and thermal properties of silicon-containing epoxy resin used for UV-curable flame-retardant coatings
作者:Xi-e Cheng、Wenfang Shi
DOI:10.1007/s10973-010-1053-9
日期:2011.1
A novel silicon-containing trifunctional cycloaliphatic epoxide resin tri(3,4-epoxycyclohexylmethyloxy) phenyl silane (TEMPS) was synthesized and characterized by FTIR, 1H NMR, 13C NMR, and 29Si NMR spectroscopic analysis. A series of flame-retardant formulations by blending TEMPS with a commercial epoxide resin DGEBA (EP828) in different ratios were prepared, and exposed to a medium pressure lamp to form the cured films in the presence of diaryliodonium hexafluorophosphate salt as a cationic photoinitiator. The thermal degradation behaviors of the cured films were evaluated by thermogravimetric analysis. The char yields under nitrogen and air atmospheres increased along with the TEMPS content. The limiting oxygen index (LOI) value increased from 22 for EP828 to 30 for TEMPS80, demonstrating the improved flame retardancy. The data from the dynamic mechanical thermal analysis showed that TEMPS had good miscibility with EP828. The T s and T g both decreased from 93 and 138 to 78 and 118 °C, respectively. The crosslinking density (ν e) increased along with the TEMPS content. The mechanical property measurements indicated that the addition of TEMPS led to a decrease in the tensile strength and an increase in the elongation-at-break.
通过傅里叶变换红外光谱、1H NMR、13C NMR 和 29Si NMR 光谱分析,合成并表征了一种新型含硅三官能团环脂族环氧树脂三(3,4-环氧环己基甲基氧基)苯基硅烷(TEMPS)。通过将 TEMPS 与商用环氧树脂 DGEBA(EP828)以不同比例混合,制备了一系列阻燃配方,并在阳离子光引发剂六氟磷酸二里碘鎓盐存在下暴露于中压灯下形成固化膜。通过热重分析评估了固化薄膜的热降解行为。在氮气和空气气氛下,随着 TEMPS 含量的增加,炭产量也随之增加。极限氧指数(LOI)值从 EP828 的 22 增加到 TEMPS80 的 30,表明阻燃性得到了改善。动态机械热分析数据显示,TEMPS 与 EP828 具有良好的混溶性。T s 和 T g 分别从 93 ℃ 和 138 ℃ 下降到 78 ℃ 和 118 ℃。交联密度(ν e)随着 TEMPS 含量的增加而增加。机械性能测量结果表明,TEMPS 的添加导致了拉伸强度的降低和断裂伸长率的增加。