环氧树脂耐电子辐照性能

研究了电子辐照对几种4,4’-二氨基二苯甲烷固化的环氧树脂造成的破坏效应.结果表明:在1.4 MeV电子辐照时,环氧树脂会变色、失重、开裂,同时力学性能下降.实验结果表明:双酚A二缩水甘油醚(DGEBA),N,N,N’,N’-四缩水甘油基-4,4’-二氨基二苯甲烷(TGDDM),对氨基苯酚三缩水甘油环氧树脂(TGPAP),DGEBA/TGDDM和DGEBA/TGPAP共混物均能承受106 Gy的吸收剂量.而DGEBA/TGPAP共混物,能承受107 Gy的吸收剂量.环氧树脂抗辐照性能的次序为DGEBA/TGPAP＞ DGEBA/TGDDM ＞TGPAP≈TGDDM＞DGEBA.环氧树脂经电子辐照后压缩模量增加,表明在辐照效应中交联机理占主导,DMA和DSC分析也证实了这一点.

Resistance of Epoxy Resins to High-Energy Electron Irradiation

The damage effects of 1.4 MeV electron irradiation on several epoxy resins cured by 4,4′-diaminodiphenyl methane were investigated.The results show that the epoxy resins are subjected to discoloration,weight loss,cracking and degradation of mechanical properties when exposed to high-energy electron irradiation.The degradation varies with absorbed dose and the chemical structure of epoxy resins.Evaluated from the extent of cracking and compressive strength reduction,all the epoxy systems studied in this work,including diglycidyl ether of bisphenol A(DGEBA),N,N,N′,N′-tetraglycidyl-4,4′-diaminodiphenyl methane(TGDDM),triglycidylether of para-aminophenol(TGPAP),the DGEBA/TGDDM and DGEBA/TGPAP blends are tolerant to the absorbed dose of 106 Gy.Only the DGEBA/TGPAP blends,which have a moderate crosslinking density,can withstand the absorbed dose of 107 Gy.The order of radiation resistance of the epoxy resins is revealed to be DGEBA/TGPAP > DGEBA/TGDDM >TGPAP≈TGDDM>DGEBA.An increase in compressive modulus induced by irradiation implies a crosslinking mechanism dominates the degradation of epoxy resins,which is confirmed by the DMA and DSC measurements.