| 초록 |
In this work, the blend system of diglycidylether of bisphenol A (DGEBA) and polyimide (PMR-15) is investigated in contact angles and mechanical tests. The content of PMR-15 is varied within 0, 5, 10, 15, and 20 phr to neat DGEBA, and DDM (4,4'-diamino diphenyl methane) is used as a curing agent for DGEBA. Contact angle measurements are performed by using a Rame-Hart contact angle goniometer. Deionized water and diiodomethane are used as testing liquids. And, Owens-Wendt and Wu's models using a geometric mean method are studied to analyze the surface free energy (γs) of DGEBA/PMR-15 blend system. Mechanical interfacial properties of DGEBA/PMR-15 system are measured in the context of critical stress intensity factor (KIC) and critical strain energy release rate (GIC) measurements. As a result, the surface free energy is increased at 10 phr of PMR-15, compared with that of neat DGEBA. The fracture toughness (KIC and GIC) shows a similar behavior with γs. This result is probably due to the development of interfacial adhesion force between intermolecules in the polymer chains. |
