| 초록 |
In this work, a blend system prepared from epoxy (EP) and polyimide (PMR-15) is investigated in terms of the cure behaviors and thermal stabilities. The cure behaviors are studied in Near-IR and DSC measurements. And, thermal stabilities are also carried out by DMA and TGA analyses. DDM (4,4'-diamino diphenyl methane) is used as a curing agent for EP and the content of PMR-15 is varied within 0, 5, 10, 15, and 20 phr to neat EP. As a result, the conversion (α) is slightly decreased with increasing the content of PMR-15. The cure activation energy (Ea) is increased at 10 phr of PMR-15, compared with that of neat EP. From the TGA results of EP/PMR-15 blend system, the thermal stabilities based on the initial decomposed temperature (IDT) and integral procedural decomposition temperature (IPDT) are increased with increasing the PMR-15 content. The decomposition activation energy (Et) shows a similar behavior to Ea, which can be resulted from the crosslinking developed by the interactions between intermolecules in the polymer chains.
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