http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
면섬유와 2-클로로에탄올 반응에 의한 히드록시에틸화 셀룰로스 섬유의 제조 - 반응 조건이 2-클로로에탄올 반응량에 미치는 영향-
박연석,양대혁,김영호,Park, Yeon Seok,Yang, Dae Hyuk,Kim, Young Ho 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.4
In this study, a one-bath process and a two-step process for the synthesis of hydroxyethylated cellulose (HEC) fibers through the reaction of cotton fibers with 2-chloroethanol (CE) were carried out, and the results of both the processes were compared with each other. A cotton non-woven fabric was treated with a solution containing both sodium hydroxide and CE in water or aqueous isopropyl alcohol (IPA) solutions as a reaction medium in the one-bath process, and the add-ons after reaction and washing were obtained. In the two-step process, the cotton non-woven fabric was padded in a 20% NaOH solution with a constant wet pickup of 300% as the first step of alkali treatment, followed by a CE reaction in a reaction medium of water or aqueous IPA solutions. The effects of reaction conditions, such as IPA concentration of the reaction media, CE concentration, reaction time, washing media, on the reacted amounts, i.e., add-ons of CE of the prepared HEC fibers were analyzed. Results showed that the two-step process is much more effective for obtaining high add-ons of HEC than the one-bath process. Aqueous IPA solution is also more effective than water as a reaction medium. The reacted amounts of the prepared HEC fibers increased on increasing both the IPA concentration in the reaction medium and the CE concentration. However, damage to HEC fibers also increased on increasing the add-ons of the reaction. The reaction for the synthesis of HEC by a two-step process is the most effective when the mol amount of NaOH in the first treatment is similar to that of CE in the second treatment.
2-클로로에탄올을 사용한 면섬유 부직포의 히드록시에틸화 개질 및 특성 분석
박연석,양대혁,김영호,Park, Yeon Seok,Yang, Dae Hyuk,Kim, Young Ho 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.5
Modification of cotton non-woven fabrics through the hydroxyethylation of cellulose using 2-chloroethanol (CE) was carried out in a two-step process of sodium hydroxide pre-treatment and CE reaction in a reaction medium of isopropyl alcohol (IPA) aqueous solution. The effects of sodium hydroxide concentration in the pre-treatment, IPA and CE concentrations, and treatment conditions of the second step were analyzed, along with washing media after treatment on the reacted amounts (add-ons) of CE and property changes of the fabrics. The add-ons of modified samples pre-treated with sodium hydroxide solution of a constant concentration and reacted with CE of different concentrations increased, reached a maximum, and then decreased with increasing CE concentration. The maximum add-on, i.e., the most effective reaction, was obtained when the molar ratio of NaOH/AGU in the pre-treatment and that of CE/AGU in the second treatment was similar. The moisture regain of the modified fabric increased almost linearly with the add-on of CE, indicating increased hydrophilicity. The hydroxyethylated fibers in the modified fabric with high add-ons were damaged severely and stuck together when the modified fabric was washed with water. However, the modified fibers obtained by washing with IPA solutions maintained their fiber shape with increased diameter even at a high add-on of up to 30%. Although the individual fibers might be deteriorated by hydroxyethylation, the tensile strength of the modified non-woven fabric obtained by washing with IPA solution increased compared to the untreated sample, because of the increase in diameter of the fibers, and thus the increased entanglements of the fibers in the fiber assembly of the non-woven fabric. Apparent dye uptake, as measured by the K/S value, of the hydroxyethylated fabric dyed with a reactive dye also increased linearly with increasing add-on amount. The K/S value of a modified fabric with an add-on of 3.5% was four times higher than that of the untreated sample, indicating that the microstructure of the cotton fiber was affected dramatically by hydroxyethylation.
형광과 인광 첨가제에 의한 적색 OLED 소자의 발광 특성
박연석,양재웅,주성후,Park, Yeon-Suk,Yang, Jae-Woong,Ju, Sung-Hoo 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.12
Red color OLED has been fabricated by the doping method apply to CBP using co-evaporation, GDI4349 of phosphorescent dopant, and rubrene of fluorescent dopant. The OLED structure are multi-layer of ITO(150 nm)/ELM_HIL(50 nm)/ELM_HTL(30 nm)/CBP : Rubrene, GDI4349 (30 nm)/BAlq (30 nm)/LiF(0.7 nm)/Al (100 nm). Accomplished best result at 3 vol.% of rubrene when the OLEDs were made of 1, 3, 5, 7, 9 vol.% doped rubrene. The highest efficiency of 7.2 cd/A was resulted at 8 vol.% of GDI4349 when the OLEDs were made among 5, 8, 11, 14 vol.% of GDI4349. Obviously, the best concentration of rubrene at 3 vol.% and changing GDI4349 concentration to 5, 8, 11, 14 vol.% OLED dramatically enhanced characteristic of resulted 10.7 cd/A at 8 vol.% of GDI4349. This result would understand to analyse as the emission efficiency increases by energy transport efficiency increase using GDI4349 energy transfer when rubrene absorbs the energy from CBP of fluorescences host.