含共引发剂的环氧树脂电子束固化特性  

ELECTRON-BEAM CURING CHARACTERIZATION OF EPOXY RESIN SYSTEMS CONTAINING CO-INITIATOR

作　　者：张佐光[1] 李玉彬[1] 吴燕[1] 孙志杰[1] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100083

出　　处：《高分子学报》2006年第2期284-288,共5页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号59833110);863计划(项目号2001AA335020)资助项目

摘　　要：对引发剂组成、含量不同的环氧树脂体系进行了低吸收剂量及高吸收剂量的电子束辐射固化,通过对不同样品辐射过程中的温度特性和辐射后的凝胶含量、内耗tanδ及动态模量变化趋势的研究,得到共引发剂对环氧树脂辐射固化的影响规律.在相同的树脂含量及吸收剂量下,共引发剂的加入可以提高环氧树脂体系的凝胶含量,但其提高幅度并不随着共引发剂含量的增多而增大,而是存在一个最佳值.随着碘盐引发剂含量的增加,共引发剂对体系凝胶含量的提高幅度减小.在辐射过程中,环氧树脂体系的温度会出现一个峰值,共引发剂对峰值温度和辐射后体系的玻璃化转变温度的影响与对凝胶含量的影响类似.碘盐引发剂含量较低时,加入共引发剂的体系的常温及高温模量与未加体系相比没有明显变化;碘盐引发剂含量较高时,加入共引发剂的体系的常温模量比未加体系有所上升,而高温模量则变化不大.Electron beam （EB） curing of polymer matrix composites offers many particular advantages compared to conventional thermal curing. There has been a considerable development about the EB curing advanced composites for the use of aerospace and other industries in recent years. Most variety of epoxy resin has been confirmed to possess radiation reactivity and have already become chief resin matrices used in EB curable composites. The influences of initiator variety and concentration on the curing characterizations of epoxy resin system containing coinitiator benzophenone and isopropanol were analyzed. The variation regularities of temperature during the radiation, the gel fraction, damping factor and dynamic modulus of samples were studied. The experimental results indicate that under the same condition of epoxy resin content and absorbed dose, the addition of co-initiator can enhance the gel fraction of system, but the enhanced extent of gel fraction does not increase with the increase co-initiator content, there exists an optimal content of the co-initiator. With the increase of onium salt initiator, the enhanced extent of gel fraction induced by co-initiator will decrease. A temperature peak appears during the radiation, and the influences of co-initiator on the peak temperature and the glass transition temperature are the same as those on the gel fraction. The room temperature modulus and high temperature modulus of cured samples with low content of onium salt initiator have little change before and after the addition of co-initiator. When the diphenyliodonium hexafluorophosphate initiator content is high, the room temperature modulus of samples with co-initiator increases, while the high temperature modulus has little changes.

关 键 词：共引发剂 环氧树脂 电子束 辐射固化 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]