| 초록 |
Thermosetting epoxy resin has been used extensively as matrices for fiber-reinforced polymeric composites because of many attractive mechanical and thermal properties. On the other hand, epoxy resin has a serious disadvantage that is generally brittle due to high crosslinking density. The concept of thermoplastic-modified thermosetting resin has been known widely in order to improve the fracture toughness without considerably reducing thermal and mechanical properties. In this work, commercial grade of polyetherimide (PEI) to improve interfacial adhesion and fracture toughness was modified using amine and carboxyl groups, carboxyl terminated butadiene acrylronitril (CTBN) and their combination. The fracture toughness and interfacial shear strength (IFSS) with their contents were measured by three-point short beam and microdroplet tests, and then they were correlated with each other. Amine and carboxyl groups and CTBN in epoxy matrix could contribute to improvement of IFSS and fracture toughness. Acknowledgment: This work was financially supported by Agency for Defense Development (ADD) through the Research Center for Aircraft Parts Technology (ReCAPT), GNU. |
