| 초록 |
In this work, the blend system of diglycidylether of bisphenol A and PMR-15 polyimide is investigated in terms of thermal, mechanical, and rheological properties. The thermal stabilities are studied by TGA and TMA analyses. Dynamic mechanical properties are carried out by DMA analysis and the mechanical interfacial properties of blend system are measured in the context of critical stress intensity factor (KIC) and critical strain energy release rate (GIC) measurements. DDM (4,4’-diamino diphenyl methane) is used as a curing agent for epoxy and the content of PMR-15 is varied within 0, 5, 10, 15, and 20 phr to neat DGEBA. As results, the thermal stabilities based on the initial decomposed temperature (IDT), the integral procedural decomposition temperature (IPDT), and the glass transition temperature (Tg) are increased with increasing the PMR-15 content. The dynamic storage modulus (E') of the blend system is increased at 10 phr of PMR-15, compared with that of neat epoxy. Mechanical interfacial properties show similar behaviors with E', probably due to the crosslinking density developed by intermolecular interactions in polymer chains. |
