In order to obtain epoxy resins with flame retardant, dielectric properties, and easier industrialization, thus meeting the future development requirements in the field of electronic encapsulation, a trifluoromethylated epoxy resin (DGEBAF) was synthesized by using a two-step method, and the cured epoxy resin (DGEBAF/DDM) was prepared with DDM as the curing agent. Detailed studies of DGEBAF/DDM including curing kinetics, mechanical properties, and dielectric properties, etc. were conducted by using DGEBA/DDM (with dimethyl structure in DGEBA) and DGEBF/DDM (with dihydrogen structure in DGEBF) as the comparative samples. The results indicate that DGEBAF/DDM has higher storage modulus and strength, better dielectric properties, and hydrophobicity, and lowest thermal expansion coefficient, due to the existence of trifluoromethyl. Importantly, deeply study about the flame retardancy and its mechanism of DGEBAF/DDM was processed, which was of great significance for its application in the field of electronic packaging. Its vertical combustion level reaches UL-94 V-0. The limiting oxygen index of DGEBAF/DDM is 34.5 %, which is improved by 35.8 % and 30.2 % compared to DGEBA/DDM and DGEBF/DDM, respectively. The thermal decomposition mechanism of DGEBAF was explored by Py-GC/Mass, XPS, and FTIR analysis. It can be inferred that trifluoromethylated epoxy resin releases •CF3 at high temperatures and effectively enhances the flame retardant of the epoxy resin through radical trapping. The smoke toxicity of DGEBAF/DDM combustion was detected in real time by conical thermal method combined with gas infrared analysis. In addition, we have found that DGEBAF/DDM decomposes at first but produces most residual carbon among the three epoxy resins. Based on the characteristics, an intelligent fire alarm system was designed.

中文翻译：

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输入多功能三氟甲基环氧树脂：优异的阻燃性、更好的介电性、低热膨胀等


为了获得具有阻燃性、介电性能且易于工业化的环氧树脂，从而满足未来电子封装领域的发展要求，采用两步法合成了三氟甲基化环氧树脂（DGEBAF），并制备了固化物。以DDM为固化剂制备了环氧树脂(DGEBAF/DDM)。以DGEBA/DDM（DGEBA中含有二甲基结构）和DGEBF/DDM（DGEBF中含有二氢结构）作为对比样品，对DGEBAF/DDM的固化动力学、力学性能和介电性能等进行了详细研究。结果表明，由于三氟甲基的存在，DGEBAF/DDM具有更高的储能模量和强度、更好的介电性能和疏水性以及最低的热膨胀系数。重要的是，对DGEBAF/DDM的阻燃性能及其机理进行了深入研究，这对其在电子封装领域的应用具有重要意义。其垂直燃烧等级达到UL-94 V-0。 DGEBAF/DDM的极限氧指数为34.5%，比DGEBA/DDM和DGEBF/DDM分别提高了35.8%和30.2%。通过 Py-GC/Mass、XPS 和 FTIR 分析探讨了 DGEBAF 的热分解机理。由此可见，三氟甲基化环氧树脂在高温下释放出·CF3，通过自由基捕获作用有效增强环氧树脂的阻燃性能。采用锥形热法结合气体红外分析法实时检测DGEBAF/DDM燃烧的烟气毒性。此外，我们发现DGEBAF/DDM首先分解，但在三种环氧树脂中产生最多的残留碳。 针对这一特点，设计了智能火灾报警系统。