Effect of γ‐ray irradiation on epoxy network polymers with different curing agents
Effect of γ‐ray irradiation on epoxy network polymers with different curing agents
复制标题
γ射线辐照对不同固化剂环氧网络聚合物的影响
DOI：
10.1002/pat.5825
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发表时间：
2022
影响因子：
3.4
通讯作者：
Satoshi MATSUDA
中科院分区：
文献类型：
--
作者：
Hajime KISHI;Ken ARIMURA;Akira IDESAKI;Takeshi KAKIBE;Satoshi MATSUDA
评价了环氧网状聚合物的耐γ-射线性能。以双酚A二缩水甘油醚(DGEBA)为环氧齐聚物，4，4‘-二氨基二苯基甲烷(DDM)、六氢苯二甲酸酐(HHPA)和酚醛酚醛(PN)为固化剂。热交联型聚合物用0-10mGY的γ-射线照射。γ辐射降低了DDM固化和PN固化的DGEBA树脂的交联度和玻璃化转变温度(Tg)，但增加了树脂的室温弹性模量和密度。而用γ-射线辐照后，HHPA固化的DGEBA树脂的玻璃化转变温度略有增加，而交联度显著降低。在三种固化体系中，HHPA固化的DGEBA树脂在辐照过程中产生的气体量最大。红外吸收光谱显示酯键减少，脂肪族和芳香族醚键增加，表明新的交联剂在断链的同时发生了新的交联。总体而言，在三个固化体系中，PN固化的DGEBA树脂在γ-射线照射下的化学结构和物理性能最稳定。
The γ‐ray resistance of epoxy network polymers was evaluated. Bisphenol A diglycidyl ether (DGEBA) was used as an epoxy oligomer, and 4,4′‐diaminodiphenylmethane (DDM), hexahydrophthalic anhydride (HHPA), and phenolic novolac (PN) were used as curing agents. The thermally crosslinked polymers were irradiated with 0–10 MGy of γ‐rays. The crosslink density as well as the glass‐transition temperature (Tg) for the DDM‐cured and PN‐cured DGEBA resins decreased upon γ‐ray irradiation; however, the elastic modulus at room temperature and the density of the resins increased. By contrast, theTgfor the HHPA‐cured DGEBA resin increased slightly and the crosslink density decreased markedly when the specimen was irradiated with γ‐rays. Among the three cured systems, the HHPA‐cured DGEBA resin exhibited the greatest amount of gas generation during irradiation. Infrared absorption spectra revealed a decrease in the number of ester bonds and an increase in the number of aliphatic and aromatic ether bonds, suggesting that new crosslinking occurred concurrently with chain scission. Overall, among the three cured systems, the PN‐cured DGEBA resin was the most stable in terms of chemical structure and physical properties under γ‐ray irradiation.
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