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A Study on the Water Resistance and Thermo-mechanical Behaviors of Epoxy Adhesives  

Park, Soo-Jin (Reliability Assessment Center, Korea Research Institute of Chemical Technology)
Kim, Jong-Hak (Reliability Assessment Center, Korea Research Institute of Chemical Technology)
Choi, Kil-Yeong (Reliability Assessment Center, Korea Research Institute of Chemical Technology)
Joo, Hyeok-Jong (Department of Polymer Science and Engineering, Chungnam National University)
Jin, Fan-Long (Advanced Materials Division, Korea Research Institute of Chemical Technology)
Publication Information
Elastomers and Composites / v.40, no.3, 2005 , pp. 166-173 More about this Journal
Abstract
Effect of thermal aging on the weight loss and water absorption of epoxy adhesives was investigated in the presence of three types of different hardeners, such as D-230, G-5022, and HN-2200. Thermal and mechanical properties of the cured epoxy resins were also studied througth the glass transition temperature and shear adhesion strength measurements. Weight losses of DGEBA/D-230 and DGEBA/HN- 2200 systems were not varied. However, the weight of DGEBA/G-5022 system was significantly decreased with increasing the thermal aging time. The water absorption of the specimens was increased as the thermal aging time increased except that using G-5022. DEGBA/HN-2200 system showed higher $T_g$ value than those of other systems, due to the formation of the fine three-dimensional network structure containing aliphatic ring. Shear adhesion strength of all systems was increased with increasing the thermal aging tine, which is attributed to increased degree of cure and fine three-dimensional network structure formation. And $T_g$ values and shear adhesion strength of all specimens exposed to water was decreased as the immersion time increased.
Keywords
epoxy resin; glass transition temperature; adhesive; water absorption; weight loss;
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