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폴리에틸렌테레프탈레이트의 용융거동에 미치는 기핵제의 영향 : ethylene terephtalate
나상권,공병기,최창용,나재운 한국공업화학회 2004 응용화학 Vol.8 No.1
Effect of nucleating agent on the melting behavior of PET was studied by DSC. The low crystallization temperature(T_(ch)) shifted to the low temperature and the nonisothermal crystallization peak temperatures(T_(cc)) shifted to the higher temperature as the concentration of the nucleating agent increased.
공병기,나상권,최창용,나재운 한국공업화학회 2004 응용화학 Vol.8 No.2
Stable titania sols for preparation of TiO₂ thin films were synthesized from titanium tetra isopropoxide. TiO₂ thin films were prepared with by dipping the sols on the glass substrates, and the properties of the films were investigated with XRD, SEM and EDS.
공병기,나상권,최창용,나재운 한국공업화학회 2004 응용화학 Vol.8 No.2
Generally, photocatalysis can be applied to get energy economically, synthesize the useful materials, and remove environmentally harmful materials by transforming solar energy to chemical energy. Recently, the availability of photocatalysis has largely interested in the environment of Ubiquitous. Therefore, the study for photocatalysis has progressed by many investigators in domestic. In this study, titania sol was prepared by the sol-gel proess and characteristics of the products was investigated by TGA, XRD and SEM.
조종수,정영일,나재운,김성호 朝鮮大學校 1997 藥學硏究誌 Vol.18 No.2
양말단에 이크릴레이트를 갖는 폴리에틸렌글리콜 미크로마(PEG macromer)와 또한 PEG macromer와 폴리하이드록시에칠메타아크릴레이트[P(HEMA)] 혹은 폴리(하이드록시에칠메타아크릴레이트-하이드록시프로메타아크릴레이트-비닐피롤리돈)[P(HEMA-co-HPMA-co-NVP)]와 상호침투된 망상구조의 시료가 소프트콘텍트렌즈의 알부민의 흡착을 막기위하여 제조되었다. PEG macromer의 중합으로 macromer의 다관능성기로 인하여 가교된 겔이 형성되었다. P(HEMA-co-HPMA-co-NVP)/PEG IPN계 콘텍트렌즈에서 PEG분자량이 중가할수록 알부민의 흡착량은 감소되었다. 또한 IPN제조시의 PEG의 농도가 짙을수록 알부민의 흡착량은 감소되었다. PEG macromer와 IPN하기전의 P(HEMA)계 및 P(HEMA-co-HPMA-co-NVP)계의 콘텍트렌즈에 비하여 PEG macromer와 IPN함으로서 렌즈의 착용감이 훨씬 상승되었다. Poly(ethylene glycol)(PEG) macromers terminated with diacrylate groups and interpenetrating polymer networks(IPN) composed of poly(hydrowyethyl methacrylate)(PHEMA) or poly(hydrowyethyl methacrylate-co-hydroxypropyl methacrylate-co-N-vinyl pyrrolidone)[P(HEMA-co-HPMA-co-NVP)]and PEG macromer were synthesized with the aim of abtaining protein adsorption resistant soft contact lens. Polymerization of PEG macromer. Crosslinked p(HEMA)or P(HEMA-co-HPMA-co-NVP) chains were interpenetrated into the cross-linked three-dimensional networks of PEG. It was found that albumin adsorption onto the contact lens prepared by P(HEMA-co-HPMA-co-NVP)/PEG IPN decreases with an increase of molecular weight of PEG. Also, it was found that albumin adsorption onto the both contact lens decreases with an increase of concentration of PEG macromer in the IPN preparation. There are also more adequate in the biointerness for the contact lens by P(HEMA)/PEG IPN or P(HEMA-co-HPMA-co-NVP)/PEG IPN than that by P(HEMA) or P(HEMA-co-HPMA-co-NVP).
김선일,권규혁,나재운 조선대학교 생산기술연구소 1991 生産技術硏究 Vol.13 No.1
The reaction of N-hydtoxysuccinimide with polyacrylic acid gave poly(N-acryloxysuccinimide), whose reaction with ampicillin and amoxycillin provided polymeric drugs. The structures of polymeric drugs were characterized by infrared and nuclear magnetic resonace spectroscopy. Antimicrobial activity of polymeric drugs was examined against various gram positive and gram neg-ative bacteia. Ampicillin derivatives revealed excellent antibacterial activity against Alcaligenes faecalis IFO 13130 and Staphylococcus aureus ATTCC 25923. Amoxycillin derivatives revealed excellent antibacterial activity against Salmonella typhimuriurn TV 119, Staphylococcus aureus FDA 209P and Bacillus lincheniformis ATCC 14580. The polymeric drugs have no antimicrobial activity against Candida alibicans ATCC 10231.
2,4,6-Collidinium Dichromate에 의한 알코올의 산화 특성 연구
김선일,한종수,나재운 조선대학교 생산기술연구소 1991 生産技術硏究 Vol.13 No.1
2, 4, 6-Collidinium dichromate(CDC) is more, stable. nonhygroscopic, and milder than other chromium(VI)oxidants. The new oxidant was characterized via rate of oxidation. CDC with pyridinium P-toluenesulfonate(PPTS) in dichloromethane was effective in oxidation of allylic, benzylic, and secondary alcohols to the corresponding carbonyl compounds at room temperature. while CDC alone did not oxidize above alcohols. Oxidation of ally lie and benzylic alcohols progressed more repididly than that of secondary alcohols. When molecular sieve(MS)was added to the CDC-PPTS system, rate of oxidation and yields increased. Saturated aliphatic primary alcohols were decomposed in two system, CDC-PPTS and CDC-PPTS system added MS. The oxidation selectivity of CDC-PPTS system was increased about 1.75 times than that of PDC-PPTS system.
졸-겔 법에 의해 제조된 광촉매 화합물의 항균 및 탈취 특성
공병기,최창용,나상권,나재운 한국공업화학회 2004 응용화학 Vol.8 No.1
Photocatalysis, which can be applied to get energy economically, to synthesis useful materials, and to remove environmentally harmful materials by transforming solar energy to chemical energy, has many advantages. In this study, photocatalystic compound was prepared by sol-gel technique for antimicrobial activity and deodorization. It showed that in case of deodorization, formaldehyde and ammonia were degraded by 98.3 and 97.1%, respectively. In addition, this compound gives the highest efficiency for disinfection of E. coli and S. aureus.
Polygoum Tinctoria와 합성 인디고 염료의 물리화학적 특성 비교
최창용,장미경,공병기,최혜영,나상권,이동병,양숙향,나재운 한국공업화학회 2002 응용화학 Vol.6 No.2
The natural dye substances appear to have a lot of benefits that enable the dyed materials to exhibit their natural colors. It may have a bit of a harmful influence on the human body itself, in comparison with the synthetic substances. It also causes hardly any environmental pollution because of the natural chemicals and costs much less to disposal. In this study was investigated physicochemical characterization of polygoum tinctoria dye substance and synthetic indigo. Calcium hydroxide was added into polygoum tinctoria leaves to precipitate dye substances and it was freezing dried into powder form. Characterizations of dye substances were investigated by UV/VIS spectrophotometer, TLC, DSC, TGA, HPLC, and MALDI-TOF Mass. Resultantly, polygoum tinctoria was confirmed that is consisted of two ingredients from these results.