电子束作用下双酚A型环氧树脂体系的固化特征

当前 ,先进树脂基复合材料基本上都是采用加热固化成型的 ,由于其工艺周期长 ,造成复合材料的制造成本较高 ,同时 ,热固化采用的固化剂和有机溶剂往往会对操作人员及环境造成危害 .为顺应复合材料低成本化和无公害化的发展趋势 ,树脂基复合材料的电子束辐射固化技术逐渐发展起来 .复合材料的电子束固化技术是在 2 0世纪 80年代初 ,由法国Ａｅｒｏｐａｔｉｃｌｅ的研究人员首先进行的1] .近年来 ,美国、日本、加拿大及欧洲的许多国家都在积极从事于研究和利用此项技术 ,并且已经取得了可观的成果2 ] .我国在这方面的研究工作也开始起步 .作…

CURING CHARACTERISTICS OF BISPHENOL A EPOXY RESIN SYSTEM UNDER ELECTRON BEAM ACTION

As an innovative manufacture technology,there has been a considerable development about the electron beam (EB) curing advanced composites in recent years.Epoxy resin,which has a lot of excellent properties and different molecular structure,is widely used as polymer matrix in composites.Most variety of epoxy resin has been confirmed to possess radiation reactivity and have already become a chief resin matrix used in EB curable composites.The radiation curing feature of bisphenol A epoxy resin was studied in this paper.Firstly,the technique of chemical extraction was used to test the curing degree of epoxy resin and the relationship between radiation dosage and curing degree was analyzed.The experimental data indicate the resin curing degree is increased with the rising of radiation dosage.But after the radiation dosage reached 100?kGy,the increasing extent became very small.The penetration process of electron beam in radiated resin and the structure of cured resin were studied.By analyzing radiation curing area of epoxy resin,it can be seen that EB exhibits intensively scattering in resin system.Around the radiation direction,the curing reaction can be initiated,and the penetration depth of EB will get to a fixed value on account of the gradual attenuation of electron energy.The results of observing the cured areas indicate that EB curing reaction spreads outwards layer upon layer around an active center when EB radiates the epoxy resin.The whole cured area is consisting of many lamellar structures.