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김정두,감상규,주창식,이민규 한국환경과학회 2004 한국환경과학회지 Vol.13 No.12
The starch-filled waterborne acrylate (SWAC) films were prepared. The structures and properties of SWAC films were investigated by infrared spectroscopy, thermogravimetric analysis, and strength test. The biodegradability of SWAC film was also studied by determination of reduced sugar products after enzymatic hydrolysis. The surface morphology of the SWAC film was investigated by scanning electron microscopy (SEM). The results showed that the tensile strength and elongation of SWAC film decreased with the increase of starch content. The SWAC film showed significantly higher water absorbed content than waterbonre acrylate film. The biodegradability of SWAC film increased as the content of starch increased. The biodegradation of starch in SWAC film by a-amylase was about 77% of that of pure starch.
가교 전분을 충전한 수성 아크릴레이트 필름의 기계적 특성과 α-Amylase에 의한 생분해
김정두,감상규,이민규 한국환경과학회 2005 한국환경과학회지 Vol.14 No.3
Starch was crosslinked with epichlorohydrin. Crosslinked starch-filled waterborne acrylate (CSWAC) films were prepared by blending this crosslinked starch with waterborne acrylate. The thermal and mechanical properties of these films were investigated by thermogravimetric analysis (TGA), tensile strength and elongation test. The biodegradability was also studied by determination of reduced sugar products after enzymatic hydrolysis and the surface morphology was investigated by scanning electron microscopy (SEM). The CSWAC film showed significantly higher tensile strength and elongation than those of starch-filled waterbonre acrylate (SWAC). The biodegradability of this film was higher than that of native starch-filled acrylate film, and was increased by the addition of crosslinked starch to the acrylate film.
김정두,유수용,문명준,이민규 한국공업화학회 2005 응용화학 Vol.9 No.1
Waterborne fluoroacylic/polyurethane composite dispersions were prepared by emulsion polymerization. Polyurethane containing hydrophilic groups previously prepared by step growth polymerization and this was dispersed with fluoroalylic monomer and other monomers in water. The structure of the composite were confirmed by using ATR-FTIR. The surface and film properties of the composites were investigated by the measurement of contact angle, surface free energy, DSC, and TGA and these properties were compared with those of physical polymer blends. As the amounts of Perfluoralkyl ethyl acrylate(FA) emulsion was increased from 0 wt% to 20 wt%, the surface energy was dramatically decreased from 37.54 dyne/cm to 14.22 dyne/cm. But little change of the contact angle observed in the amount of the FA emulsion up to 20 wt%. The results showed the advantages of the composite dispersions over the physical polymer blends.
합성 Goethite에 의한 인산이온, 황산이온 및 구리이온의 흡착 특성
김정두,유수용,문명준,감상규,주창식,이민규 한국환경과학회 2003 한국환경과학회지 Vol.12 No.9
Adsorption of phosphate, sulfate, and copper ion to goethite was investigated. Goethite was prepared in the alkaline solution. In the single adsorbate systems, the final equilibrium plateau reached within 20 min. The adsorption isotherms of the individual ions could be well described by the Langmuir equation. The maximum adsorption capacities (q_(max)) were calculated as 0.483 mmol/g and 0.239 mmol/g at pH 3 for phosphate and sulfate ion, and 0.117 mmol/g at pH 6 for copper ion, respectively. In competitive adsorption system with phosphate and sulfate, phosphate ion was a stronger competitor for adsorption on goethite than sulfate ion, which was consistent with higher affinity of phosphate ion for the surface compared to sulfate ion. The existence of sulfate ion enhanced the adsorption of copper ion but the adsorption of sulfate was inhibited when copper ion was present.
전분 충전 아크릴레이트 필름의 α-Amylase에 의한 생분해
김정두,유수용,감상규,주창식,이민규 한국환경과학회 2004 한국환경과학회지 Vol.13 No.9
The biodegradability of vinyl acetate acrylate resin and corn starch blend was studied by determination of the reduced sugars produced after enzymatic hydrolysis. The starch hydrolysis reaction by a-amylase was achieved within 5 minutes. Optimal ranges of temperature and pH for the starch hydrolysis by a-amylase were around 80 ℃ and 6.5-7.2, respectively. The biodegradability of the starch-filled acrylate films increased as the content of starch increased. The biodegradation of starch in the starch-filled acrylate film by a-amylase was about 48.6% of that of pure starch. This value of biodegradable starch-filled acrylate film gave a good result with enzymatic shortcut test. The surface morphologies of the starch-filled acrylate film after enzymatic hydrolysis were investigated by scanning electron microscopy (SEM).
환경친화형 수분산성 불소 아크릴레이트 공중합체에 의한 섬유 표면개질
유수용,김정두,문명준,서차수,주창식,이민규 한국환경과학회 2004 한국환경과학회지 Vol.13 No.10
Waterborne fluorinated acrylate copolymer (WFAC) for surface modification of textile was synthesized from perfluoroalkyl ethyl acrylate, octadecyl acrylate, glycidyl methacrylate, surfactant and 3,3 methyl-methoxy butanol. The structures of the synthesized WFAC were determinated by FT-IR and ^(19)F-NMR analysis. The thermal stability investigated with DSC and TGA was decreased with increasing the content of fluorinated acrylate in the copolymer. However, the particle sizes of WFAC were increased with increasing the content of fluorinated acrylate in the copolymer. The surface energies calculated by contact angles of WFAC were in the range of 29.80~3.41 dyne/cm. On the observing SEM of the textile surface treated with WFAC, the textile was swollen and compacted with increasing the concentration of water repellency agent. WFAC synthesized in this study showed a good water repellency.