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이한섭,강안수 용인대학교 자연과학연구소 2001 自然科學硏究所論文誌 Vol.6 No.1
Resource recovery ailed recycling of materials and products, including polyurethanes is viewed as a necessity in today's society Most urethane polymers are made from a polyol and a diisocyanate. these can be chemicals such as water, diamines or diols that react with isocyanate groups and add to the polymer backbone. The problems of recycling polyurethane wastes has major technological, economic and ecological significance because polyurethane itself is relatively expensive and its disposal whether by burning is also costly. In general, the recycling methods for polyurethane could be classified as mechanical, chemical and feedstock. In the chemical recycling method, there are hydrolysis, glycolysis, pyrolysis and aminolysis. This study, the work was carried out glycolysis using sonication and catalyzed reaction. Different kinds of recycled polyols were produced by current method(glycolysis), catalyzed reaction and sonication as decomposers and the chemical properties were analyzed. The reaction results in the formation of polyester urethane diols, the OH value which is determined by the quantity of diol used for the glycolysis conditions. The glycolysis rates by sonication for the various glycols, increased as fallows: PPG <PEG < DEG < EG. The recycled polyol of sonication reaction had much higher OH value, much lower decomposition temperature and time than the recycled polyol of current method in which same glycols and catalyst were used.
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廢水産 資源의 게껍질로 부터의 chitin과 多樣한 分子量의 chitosan의 製造에 關한 硏究
李漢燮 용인대학교 자연과학연구소 1997 自然科學硏究所論文誌 Vol.2 No.2
In spite of various application of chitin derivatives from waste marine sources, commercial use of chitin has been limited due to highly resistance to chemicals and the absense of proper solvents. therefore, We was studied that chitin was prepared from cab shells by Hackman's method and another molecular weight chitosan were prepared from chitin which were deacetylated under various concentration of NaOH solution, reaction time and temperature by the application of Mima's method. Besides, The major parameters for these manufacturing methods were found to be concentration of alkali solution, reaction time and temperature etc. The effects of these parameters on another molecular weight chitosan dervatives were investigated. SEM analysis showed that both chitin and chitosan had a particle shaped morphology and another molecular weight chitosan according to the particle size was much smaller than that of chitin.
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溶液블랜딩법에 의한 키토산/PVA 블랜드 필름의 酵素와 pH 分解
李漢燮 용인대학교 자연과학연구소 1998 自然科學硏究所論文誌 Vol.3 No.2
Polyvinyl alcohol[PVA] is useful for the production of water-soluble packaging, paper, textile sizes. Chitosan and PVA are known as biodegradable polymers. Chitosan/PVA blend films were prepared by solution blends method in the weight ratio of chitosan for the purpose of useful biodegradable films. Thermal and mechanical properties of chitosan/PVA blend films such as DSC, impact strength, tensile strength and morphology by SEM were determined. As a result, The ratio of 10% chitosan/PVA blend films were similar to PVA. Blend films were completely degraded pH 4.0 better than 7.0, 10.0 in the buffer solution. Also, Blend films were rapidly degraded enzyme(β-glucosidase)solution better than pH solution by Enzymolysis.
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이한섭 용인대학교 자연과학연구소 2004 自然科學硏究所論文誌 Vol.9 No.1
Dual actions are the most recently used delivery system in drug study. Dual-action agents are unique chemical entities comprised of two different type of antibacterial compounds covalently linked together in a single molecule in such a way that both components are able to exert their bactericidal properties. Crosslinked sulfadiazine-sulfanilamide such as antibiotics is synthesized by synthetic handle with glutaraldehyde. As a result, New synthetic antibacterial agent exhibited the broad antibacterial activities against Grarn(+) and Gram(-) of 4 strains and a long durability supposing that the stomach and blood.
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감광제용 Diazide 유도체의 합성과 감광 특성에 관한 연구
이한섭 용인대학교 자연과학연구소 2002 自然科學硏究所論文誌 Vol.7 No.1
Naphthoquinone diazide derivatives members of quinone diazide compound that are utilizable as photosensitive polymer material were synthesized, and photoresist were prepared by mixing these derivatives with a matrix resin at various weight ratios. Photosensitive characteristics of photoresist were studied by examining UV and IR, relative sensitivity using a Gray scale method, and SEM to alalyze if they can be used as photosensitive material in printing process. Experimental results showed that, by UV, NQD derivatives were photo - converted and developer-soluble photoresist were produced, The mixing ratio of 1 : 4(by mass) of NQD + ballast and m-cresol novolak gave rise to the highest dissolution rate. In addition, photoresist obtained at this condition resulted in the most superior sensitivity and contrast.
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