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RISS 인기검색어
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- 저자 : 이시춘 ( Shichoon Lee ) (검색결과 4 건)
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환원된 산화그래핀과 산화흑연의 오일 흡착특성에 관한 비교 연구
이시춘,Lee, Shichoon 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.6
Oil adsorption capacities of reduced graphene oxide (RGO) and graphite oxide (GO) were investigated and compared with commercial graphite products. Adsorption capacities were determined by measuring the adsorbed amounts using a tea bag containing the adsorbent materials. RGO and GO showed higher adsorption capacities than other graphite adsorbents. This is attributed to the increase in the interlayer spacing and consequent development of mesopore structures, resulting in a decrease in the bulk density and increase in adsorption. Expanded graphite (EG) prepared in the laboratory showed a worm-like structure and good adsorption; however, commercial milled EG showed low adsorption capacities because the pores were crushed.
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이시춘 ( Shichoon Lee ),김형수 ( Hyungsu Kim ) 한국화학공학회 2021 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.59 No.3
An intermeshing corotating twin screw extruder is mainly used for compounding polymeric materials. Twin screw extruder can adopt modular-type screw configurations, which directly controls the quality and productivity of the products. The types, shapes, and specifications of the screw and kneading elements are summarized, and the effects of screw configuration on the processabiliy of the materials are discussed. The principles of screw configuration universally applied to mass production of general-purpose resins are explained, and the guidelines of screw combination according to the roles of feeding, melt mixing, and metering zones are listed. The strategies of screw combination suitable for various cases, such as side feeding of liquid additives or inorganic fillers, reactive extrusion, devolatilization process, production of products requiring bright color and transparency, and processing of materials with low apparent specific gravity, are presented.
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이온성 액체 첨가를 통한 폴리카보네이트의 난연성 향상 연구
이홍찬,이시춘,Lee, Hong Chan,Lee, Shichoon 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.6
Flame-retardant polycarbonates have been produced by addition of metal sulfonate compounds. However, the process is to be validated for thin-walled products. In this study, to improve flame retardancy of polycarbonate, an ionic liquid was additionally added. With a decrease in the second combustion time, a small quantity of the ionic liquid as less as 0.05 phr was enough to effectively meet the UL94 V0 protocol. Thermogravimetric experiments showed that the maximum weight loss rate increased with addition of the ionic liquid, indicating the sudden decomposition of polycarbonate. This sudden decomposition increased the rate of formation of char components during flaming, resulting in improvement of flame retardancy of polycarbonate.
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Preparation of Non-flammable Wiper Paper by Simple H<sub>3</sub>PO<sub>3</sub> Treatment
이홍찬,이시춘,Lee, Hong Chan,Lee, Shichoon Convergence Society for SMB 2020 융합정보논문지 Vol.10 No.6
매우 얇고 다공성 비인화성 와이퍼 용지를 아인산 수용액 처리에 의해 준비되었다. H<sub>3</sub>PO<sub>3</sub> 처리는 와이퍼 용지의 난연성을 불연성 수준으로 개선시켰다. 열중량 분석 결과 700℃에서 잔량이 50%까지 증가했다. 이것은 본 실험과 같은 아인산 처리가 셀룰로오스 사슬의 탈수를 돕고, 연소중에 차르(char)와 유사한 구조의 형성을 촉진한다는 것을 의미한다. FT-IR과 X선 광전자 분광학에서는 H<sub>3</sub>PO<sub>3</sub>의 일부분은 셀룰로오스 사슬의 작용기와 반응하는 것으로 보였다. 반응한 아인산은 셀룰로오스의 체인의 탈수를 촉진하고, 차르와 같은 구조의 형성을 도와 와이퍼 용지의 난연성을 향상시킨다. A thin and porous non-flammable wiper was prepared by phosphorus acid solution treatment and subsequent oven annealing. The H<sub>3</sub>PO<sub>3</sub> treatment improved flame retardancy of wiper paper to nonflammable level. Thermogravimetric analyses showed that residues increased to 50% at 700℃, which means this treatment helps dehydration of the cellulose chain and promotes the formation of char-like structures during the burning. FT-IR and X-ray photoelectron spectroscopy showed that some of the added H<sub>3</sub>PO<sub>3</sub> could react with the functional groups of the cellulose chain. The reacted H<sub>3</sub>PO<sub>3</sub> components promote dehydration of the cellulose components and the formation of a char-like structure and improve the flame retardancy of the wiper paper.
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