低光衰环氧树脂共聚物的制备

Preparation of epoxy resin copolymers with low luminous decay

采用接枝缩聚的方法,将端羟基硅酮(HTPDMS)与环氧树脂(EP)反应,制各低光衰HTPDMS接枝EP(EP-g-HTPDMS)共聚物。利用傅里叶变换红外光谱和热重分析表征其结构,并将制备的EP-g-HTPDMS共聚物应用于发光二级管封装,通过测试光衰和折射率分析其光学性能,同时利用硬度测试仪和扫描电子显微镜研究其力学性能和微观结构。结果表明:HTPDMS成功接枝在EP分子链中;引入HTPDMS对共聚物折射率的影响并不明显,当w(HTPDMS)小于9%时,共聚物的相对输出功率均高于EP,光衰明显降低;随着w(HTPDMS)增加,共聚物的硬度减小;引入HTPDMS使共聚物断面呈韧性断裂,体系的内应力降低,抗开裂性能得到改善。

Copolymers of epoxy resin grafted by hydroxy-terminated silicone（EP-g-HTPDMS） with low luminous decay were prepared by graft condensation polymerization from EP and HTPDMS. The structure of the EP-g-HTPDMS copolymers was characterized by Fourier transform infrared spectroscopy（FTIR） and therm ogravimetrie（TG） analysis. The EP-g-HTPDMS copolymers were applied to package of light-emitting diode, and its optical properties were studied by luminous decay and refractive index test. The mechanical properties and micro-morphology of the copolymers were analyzed by hardness tester and scanning electron microscope（SEM）. The results indicate that HTPDMS is successfully incorporated into EP molecular chain. Adding HTPDMS has unobvious effect on the refractive content is less than 9%, the relative light output of the unmodified EP and luminous decay reduces significantly. index of the copolymers. When HTPDMS mass EP-g-HTPDMS copolymers is higher than that of The hardness of the copolymers decreases with increasing HTPDMS mass content. The introduction of HTPDMS makes the copolymer exhibit the features of tough fracture, lowers the internal stress in the system and improves the resistance to cracking.