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研究了电子辐照对几种44,’-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。
The destructive effects of electron irradiation on several 44’-diaminodiphenylmethane cured epoxy resins were studied. The results show that at 1.4 MeV electron irradiation, the epoxy resin discoloration, weight loss, cracking, mechanical properties decreased at the same time. The experimental results show that bisphenol A diglycidyl ether (DGEBA), N, N, N ’, N’-tetraglycidyl-4,4’-diaminodiphenylmethane (TGDDM), p- aminophenol triglycidyl Epoxy resin (TGPAP), DGEBA / TGDDM and DGEBA / TGPAP blends were able to withstand the absorbed dose of 106 Gy. The DGEBA / TGPAP blends can withstand an absorbed dose of 107 Gy. The order of the anti-radiation properties of epoxy resin is DGEBA / TGPAP> DGEBA / TGDDM> TGPAP≈TGDDM> DGEBA. The compression modulus of epoxy resin increased after irradiation with electron, indicating that the crosslinking mechanism dominated the irradiation effect, as confirmed by DMA and DSC analysis.