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윤경성,이용택,최동훈 慶熙大學校 材料科學技術硏究所 1996 材料科學技術硏究論集 Vol.9 No.-
The synthetic process and characteristics of organic /inorganic composite 2nd-order NLO materials with modified polyimides was studied in this study with accumulated experiences in the developments of organic/inorganic hybrides NLO materials via Sol-Gel process and in the fabrication of PI. In a detail contents, alkoxy silane dye was made using disperse red1(DR1) with high optical nonlinearity and PI with good thermal stability. The alkoxy silane DR1 will be treated into film form through Sol-Gel process with silane coupling agent. The film form of alkoxy silane DR1-PAA was heat-treatmented after go through the corona poling technique process. So, the of organic/inorganic composite NLO materials of chemical cross-linking structure as highly electro-optic coefficient which results from the formation of imide combination because of excellent thermal stability of imide combination and Si-O combination and stabilization of dye orientation through heat treatment and corona poling technique process.
박병천,이성길,이용택 慶熙大學校 材料科學技術硏究所 1997 材料科學技術硏究論集 Vol.10 No.-
Epoxy resin based upon the N,N'-diglycidylaniline was modified with poly(amic acid)(PAA). Prior to aromatic amine cure, the possible reactions in the epoxy resin/PAA blends were investigated used FT-IR and inherent viscosity techniques with the addition of 4,4'-diamino-3,3'-diethyldicyclohexylmethane(3DCM) as hardener. PI-modified epoxy(GAYA) blends were prepared by IPNs method. IR, TGA, DSC, DMA, TMA and UTM are used to measured the thermal and mechanical properties. Thermal stability increasing with increasing PAA content in blends. Lowering Tgs with increasing PAA content in blends are observed except for the blend modified with thermoplastic. Improvement of the impact strengths in J/M in the range 920∼2,412 are observed for blends and the improvement of the impact strength is closely related to the content of PAA in blends. A rough surface was observed by SEM examination on the propagation surface of the impact specimen, while a smooth surface is observed on the unmodified epoxy specimen. The morphological observations suggest the PAA segment may act as a toughening agent in the epoxy networks, thus contributing to the impact improvement of the blends.