| 초록 |
In this work, a zeolite/diglycidylether of bisphenol A (DGEBA) system was investigated in terms of the cure kinetics, thermal stabilities, and mechanical interfacial properties. 4, 4'-diamino diphenyl methane (DDM) was used as a curing agent for epoxy. Zeolite was treated with 15 and 35 wt% KOH (15-BZ and 35-BZ) for 24 h, respectively. X-ray photoelectron spectroscopy (XPS) was studied for the surface characteristics. Cure kinetics and thermal stabilities of the composites were examined in the context of differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Also, the mechanical interfacial prpoerties were investigated in critical stress intensity factor (KIC). In the result of XPS, sodium ion (Na+) of zeolite was exchanged for potassium ion (K+), resulting from the treatment of KOH. Also, Si2p/Al2p composition ratios of treated zeolites were increased, which could be attributed to the weakening of Al-O bond in framework. Cure activation energy (Ea) of 15-BZ composites was decreased, whereas decomposition activation energy (Et) was increased, compared with those of PZ and 35-BZ composities. Also, KIC had high value at 15-BZ composites. The results could be discussed in the changed structures of zeolite.
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