摘要
分析了环氧树脂电子束辐射固化的物理特征 ,电子束辐射固化过程受活性中心扩散控制 ,整个固化区域由片层状结构组成 .与电子能量沉积分布相对应 ,环氧树脂辐射固化度的最高值是在一定深度而不是在辐射表面出现 .对电子束辐射环氧树脂体系的固化过程进行了模型解释 ,固化区域大小主要由电子的能量传递范围和浓度决定 。
In accordance with the trend towards cheap and trouble-free curing techniques, electron beam (EB) curing of composites involves using electron radiation to initiate the polymerization and crosslinking reaction in suitable matrix resins. EB curing technology of composites offers many advantages compared to conventional thermal curing and is an important innovative technology at present. Most variety of epoxy resins has been confirmed to possess radiation reactivity and has already become the chief resin matrix used in EB curable composites. The physical characteristics of epoxy resin systems cured by electron beam radiation were studied. The results of observing the cured areas indicate that EB-cured resins extend layer upon layer around active centers. Whole cured area consists of many lamellar structures. Through the analyses on the changes of curing degree with the radiation depth in the cured samples, it can be found that the gel fraction of cured epoxy resin increases with the rising of radiation dose. A maximum curing degree occurs at a certain depth of resin systems, but not at the top surface. A model interpretation was made for the process of electron beam curing. The dimension of cured areas is dependent on the pervasion power and concentration of high-energy electrons in the resin systems, and the influence of diffusion of reaction active centers is weak.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2003年第5期699-703,共5页
Acta Polymerica Sinica
基金
国家自然科学基金资助项目 (基金号 5 983 3 110 )
国家 863项目 (项目号 2 0 0 1AA3 3 5 0 2 0 )资助
关键词
电子束固化
环氧树脂
物理特征
固化程度
辐射固化
radiation curing
epoxy resin
electron beam
physical characteristic
curing degree
