Aging Behavior and Damage Mechanism of Adhesives in the Hydrothermal Environment
SUN Maojun1,2,*, HU Tao1,2, LUAN Hongbo1, LI Qian1,2, SHE Zuxin1, BAI Yuhe1, WANG Ling1,2, YANG Xiaokui1, ZHOU Kun1
1 Southwest Technology and Engineering Research Institute, Chongqing 400039, China 2 CSGC Key Laboratory Ammunition Storage Environmental Effects, Chongqing 400039, China
Abstract: Moisture-temperature alternative test was applied to silicon rubber adhesive and epoxy adhesive, which are two typical types of adhesives. Their aging behavior and damage mechanism in the hydrothermal environment were studied from material and bonding interface perspectives, etc. The results show that the post-curing reaction exists in the initial stage of experiment, which leads to the increase of tensile shear strength and thermal decomposition temperature. Moreover, the tensile shear strength and thermal decomposition temperature decrease along with the aging process. The interface failure mode of silicon rubber adhesive transforms from mixed failure (dominated by cohesive failure) to interface failure. And the interface failure mode of epoxy adhesive transforms from mixed failure (dominated by interface failure) to interface failure. In addition, the side group oxidation, the cyclization depolymerization of Si-O structure, hydrolysis reaction, and cross-linking reaction may occur during the aging of the silicone rubber adhesive. And the degradation of C-N bond and oxidation reaction of the hydroxyl group/N-linked methy-lene group could exist in the aging of the epoxy adhesive.
孙茂钧, 胡涛, 栾红波, 李茜, 佘祖新, 柏遇合, 王玲, 杨小奎, 周堃. 胶粘剂在湿热环境下的老化行为规律及环境损伤机理[J]. 材料导报, 2024, 38(5): 22090006-6.
SUN Maojun, HU Tao, LUAN Hongbo, LI Qian, SHE Zuxin, BAI Yuhe, WANG Ling, YANG Xiaokui, ZHOU Kun. Aging Behavior and Damage Mechanism of Adhesives in the Hydrothermal Environment. Materials Reports, 2024, 38(5): 22090006-6.
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2024, Vol. 38 
