http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Water-resistant Lignin/Poly(vinyl alcohol) Blend Fibers for Removal of Hexavalent Chromium
곽효원,우희창,김의화,이기훈 한국섬유공학회 2018 Fibers and polymers Vol.19 No.6
Lignin is the second most abundant renewable biomass-derived natural resource that has been used to replace traditional petrochemical-based materials. However, fabricating the lignin component into the various forms required for practical application is still challenging. In this work, we fabricated water-resistant lignin/poly(vinyl alcohol) (PVA) blend fibers by wet spinning and glutaraldehyde crosslinking methods. The effect of the lignin/PVA blend ratio and glutaraldehyde crosslinking process on the physicochemical properties of wet-spun lignin/PVA blend fibers were studied using maximum draw ratios, hydrolytic degradation profiles, and mechanical properties. Furthermore, the hexavalent chromium [Cr(VI)] removal behavior of lignin/PVA blend fibers was investigated according to the effect of pH, initial Cr(VI) concentration, and contact time. The wet-spun lignin/PVA blend fiber achieved excellent water stability through glutaraldehyde crosslinking and exhibited notable Cr(VI) adsorption capacity (350.87 mg/g) and good regeneration ability. These findings demonstrate that glutaraldehyde-crosslinked lignin/PVA blend fibers could be promising adsorbents for the remediation of heavy metal species containing textile wastewater.
유기용매를 이용한 PVA/밀 글리아딘 블렌드 섬유의 제조 및 특성분석
곽효원,김무곤,오한진,이정윤,윤해성,이종환,이기훈,신봉섭,Kwak, Hyo-Won,Kim, Moo-Kon,Oh, Han-Jin,Lee, Jeong-Yun,Yun, Hae-Sung,Lee, Jong-Hwan,Lee, Ki-Hoon,Shin, Bong-Seob 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.4
In this study PVA/wheat gliadin blend fiber was prepared by wet spinning using DMSO as a solvent and acetone/methanol as a coagulant. The PVA content should be greater than 40% to demonstrate successful drawing. The maximum draw ratios of the blend fiber were 6, 7.5 and 8, when the PVA content was 40, 60 and 80%, respectively. The surface of the blend fiber became rougher and macrovoids were found when the content of gliadin was increased, this was due to the skin-core effect. The ultimate stress, breaking strain and modulus of the blend fiber were increased with an increase of the PVA content. The crystallinity of the blend fiber decreased when the gliadin content increased, the secondary structure of the gliadin however did not change in the presence of PVA. In order to increase the water stability of the blend fiber, further cross-linking was performed which also improved the mechanical properties of the blend fiber.
습식방사를 통한 밀 글리아딘 섬유 제조에 머캅토에탄올이 미치는 영향
곽효원,윤나경,이다정,이기훈,Kwak, Hyo Won,Yun, Na Kyong,Lee, Da Jeong,Lee, Ki Hoon 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.3
Wheat gliadin is an ethanol-soluble fraction of wheat protein. It has several intramolecular disulfide bonds, which are cleavable by reductants such as 2-mercaptoethanol. We added 2-mercaptoethanol into the dope solution prepared by dissolving wheat gliadin in DMSO. The dope solution was spun into an acetone/methanol coagulation bath. The viscosity of the dope solution was increased and the spinnability was also improved by the addition of 2-mercaptoethanol. A maximum draw ratio of 3.5 was achieved with the addition of 2-mercaptoethanol whereas, that of non-added fiber was only 2. Furthermore, the mechanical properties of the fiber were slightly improved by the addition of 2-mercaptoethanol. These positive effects are due to the increase of chain entanglement by the cleavage of intramolecular disulfide bonds.
Chromium(VI) Adsorption Behavior of Silk Sericin Beads
곽효원,양예솔,김무곤,이정윤,윤혜성,김민화,이기훈 한국잠사학회 2013 International Journal of Industrial Entomology Vol.26 No.1
Silk sericin (SS) has been fabricated into beads using a 1 M LiCl/DMSO solvent and utilizedas a heavy metal adsorbent. Among the various heavy metals, we targeted Cr(VI) foradsorption using SS beads and found that its adsorption depended on the coagulant usedfor the fabrication of the SS beads. When methanol was used as a coagulant, the beads hada better adsorption capacity than when ethanol was used except at pH 1. The adsorptionbehavior of Cr(VI) on the SS beads followed the BET isotherm. The maximum adsorptioncapacity was 33.76 mg/g at pH 2. The adsorption of Cr(VI) was confirmed by FT-IR and EDSanalyses. Finally, the desorption was carried out using NaOH solution, and it was found that73.19% of the adsorbed Cr(VI) could be detached.
Monitoring of phase separation between silk fibroin and sericin using various dye system
곽효원,이기훈 한국잠사학회 2015 International Journal of Industrial Entomology Vol.30 No.1
Understanding the interactions between fibroin and sericin is crucial in solving the mechanismof silk spinning. In this study, various commercially available dyes were used to monitor theinterface between fibroin and sericin during the gelation of fibroin. The phase separationbetween fibroin and sericin could be observed by the addition of azo dyes over a certainmolecular weight. Furthermore, the addition of the dyes to the sericin layer showed vividphase separation over addition to the fibroin layer