环氧树脂电子束固化过程中的电子能量传播机制  

Energy Transmission Mechanism of Electrons in Epoxy Resin During Electron Beam Curing Process

作　　者：李玉彬[1] 张佐光[1] 杨嘉陵[2] 

机构地区：[1]北京航空航天大学材料科学与工程学院 [2]北京航空航天大学航空科学与工程学院,北京100083

出　　处：《高等学校化学学报》2007年第7期1383-1387,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:59833110);国家'八六三'计划项目(批准号:2001AA335020)资助

摘　　要：将环氧树脂辐射固化过程中的温度分布和辐射固化后的固化度分布与反应前的电子能量沉积模拟计算结果相结合,探讨电子束在辐射固化过程中的能量传播机制.结果表明,辐射开始初期,固化反应发生前,电子能量在聚丙烯模具内环氧树脂体系中的沉积满足离子注入理论,即电子能量沉积在距辐射表面一定距离处达到最大,然后随辐射距离的增加沉积能量减小;而在玻璃模具内的树脂体系中,电子能量从辐射表面向里逐渐降低.随体系中固化反应的发生,最大电子浓度区域转移,最终出现在临近最大电子沉积浓度区域辐射深度稍远的地方.能量吸收和反应放热导致的升温不影响树脂固化度大小,但会影响固化度分布.A method was proposed to study the energy transmission mechanism of electrons in epoxy resin system during the electron beam （EB） curing. The energy deposition curves were simulated with a Monte Carlo method before radiation curing. The temperature of points in epoxy resin were monitored during the EB curing, and the distribution of cure degree in EB-cured epoxy resin was investigated. The results from the calculation and measurement were combined to discuss the energy transmission mechanism during the radiation curing. At the beginning of radiation, the electron energy deposition in the. resin in polypropylene mould coincides with the ion implantation theory, the maximum energy deposits at a certain depth in the resin systems, and then the energy deposition decreases with the increase of the distance from the radiation surface. But in glass mould, the maximum energy deposits at the radiation surface, and then the energy deposition also decreases with the increase of the distance from the radiation surface. The location where the electron concentration is the maximum changes with the radiation cure reaction. Finally, it appears near the zone in which the calculated electron deposition is the maximum, and it is more farther from the radiation surface. The elevated temperature from absorbing energy and in the exothermal reaction has nothing to do with the value of cure degree, but will affect the distribution of cure degree.

关 键 词：环氧树脂 电子束 辐射固化 能量沉积 能量传播 

分 类 号：O631[理学—高分子化学] O644[理学—化学]