폴리에스테르 직물의 알칼리처리가공에 관한 연구

조환,이석영,장두상,최상화,Cho, Hwan,Lee, Suk-Young,Chang, Du-Sang,Choi, Sang-Hwa 한국섬유공학회 1982 한국섬유공학회지 Vol.19 No.6

A study has been made to determine if the hardness of treating and washing solution in the alkali treatment of polyester fabric affects its weight loss and ethylene glycol produced during the finishing affects the fabric's weight loss and breaking strength. The results are as follows: As the hardness of treating solution increases, the weight loss of polyester fabric decreases remarkably and insoluble precipitate sticks on its surface. When hard water is used as washing solution or weak acid used in neutralizing the fabric after alkali treatment, white powder sticks on the surface of the fabric. The weight loss of polyester fabric increases more when the fabric is treated in sodium hydroxide solution containing ethylene glycol than in the solution without ethylene glycol. The breaking strength decreases as weight loss increases, but it is almost constant at the same weight loss when the fabric is treated in the sodium hydroxide solution with or without ethylene glycol.

극세섬유직물의 濃色化 技術

曺煥 한국염색가공학회 1992 韓國染色加工學會誌 Vol.4 No.2

Mono-sodium Ethylene Glycolate에 의한 PET직물의 친수화 가공에 관한 연구

조환,허만우,오유현,천태일,Cho, H.,Huh, M.W.,Oh, Y.H.,Chun, T.I. 한국섬유공학회 1986 한국섬유공학회지 Vol.23 No.2

In order to improve the hydrophilic property of PET fabric, the fabrics were weight loss-treated in synthesized mono-sodium ethyleneglycolate(MSEG). The rates of weight loss, hygroscopicity and antistatic properties were measured. And the following observations were made; PET fabric decomposed and decreased its weight in MSEG solution. Tensile strength decreased as the rate of weight loss increased and the decrease of tensile strength was nearly similar when treated with MSEG and with NaOH for the same rate of weight loss. Hygroscopic and antistatic properties were improved during the decomposition of PET by MSEG treatment.

20돌을 맞은 한국염색가공학회 회원에게

조환 한국염색가공학회 2009 염색가공 Vol.4 No.-

제전성 수지가공법의 개발 및 그 응용

조환,김수창,권영호,정원규,Cho, Hwan,Kim, Soo-Chang,Kwon, Yeung-Ho,Chung, Won-Kyu 한국섬유공학회 1980 한국섬유공학회지 Vol.17 No.2

Investigations were made of the use of polyamides and polyamides containing disulfide linkages as antistatic resin finishing agents for polyester (PET), polyester/cotton (T/C, 65/35%) and nylon fabrics. The details and preliminary results are presented in this paper. The polyamides were synthesized from 3, 3' -dithiodipropionyl chloride (DTDPC), 2,2'-dithiodiglycolyl chloride (CTDGC) and diamines, and the polyimide was synthesized from DTDPC and apueous ammonia, both by interfacial polycondensation on the surface of fabrics. Frictional electrostatic voltages were measured by the rotary static tester to determine the degree of antistaticity. Antistatic effects of the polymers containing disulfide linkages were recognized on those PET and T/C, which could be explained by assuming that the disulfide arrangements were converted to pseudo-conjugated double bond patterns. A few samples of nylon fabrics showed increase, rather than decrease, in electrostatic voltage; the phenomena seem to be the result of intermolecular crosslinking of the nylon's active hydrogen with DTDPC and DTDGC. The measurement of breaking strengths of nylon specimens made to examine formation of crosslinking indicated that the strengths of highly antistatic specimens remained unchanged while those of low antistatic specimens dropped significantly.

Diphenyl Methyl Phosphate와 Diphenyl Ethyl Phosphate의 합성 및 PET 직물에 대한 방염성

조환,이광우,조인술,허만우,조용석,장두상,김수창,Cho, Hwan,lee, Kwang-Woo,Cho, In-Sul,Huh, Man-Woo,Cho, Yong-Suk,Chang, Du-Sang,Kim, Soo-Chang 한국섬유공학회 1989 한국섬유공학회지 Vol.26 No.5

For the development of technology for durable flame retardant finish of PET fabrics, an experimental study was carried out, The following conclusions were drawn: 1. In the synthesis of diphenyl methyl phosphate(DPMP) and diphenyl ethyl phosphate(DPEP) which served as flame retardant for PET, the process using nitrogen current to expel HCl gas in the reaction system is practicable without the use of solution such as pyridine or tertiary amine. 2. DPMP and DPEP showed good flame retardancy effects. 3. PET fabrics treated with DPMP and DPEP were excellently durable to repeated washings and wet cure gave softer touch than dry cure.

Ethylene Glycol이 Poly(ethylene Terephthalate) 섬유의 알칼리 가수분해에 미치는 영향

조환,장두상,이석영,김영범,Cho, Hwan,Chang, Du-Sang,Lee, Suk-Young,Kim, Young-Beum 한국섬유공학회 1986 한국섬유공학회지 Vol.23 No.6

Poly(ethylene terephthalate)(PET) fabrics were treated with various concentrations of NaOH and ethylene glycol(EG) at different temperatures to investigate the effects of EG, which was produced during the hydrolysis of PET by NaOH. The dissolution rate constant was calculated by Kuriyama's equation. It showed a linear relationship to the concentration of NaOH and an exponential relationship to treating temperature the concentration of EG. Apparent activation energy of dissolution was 18.9-21.0 Kcal/mol and decreased slightly with increasing the concentration of EG but no relationship between the concentration of NaOH and apparent activation energy was noted. The tensile strength of NaOH treated filament decreased rapidly with the increase of weight loss and there was no difference between PET filament treated in ethylene glycolic and aqueous NaOH solutions. The density and crystallinity of treated PET increased with the increase of weight loss. It was more prominent in ethylene glycolic than in aqueous NaOH solution. More moisture regain was noted PET fabrics treated in ethylene glycolic NaOH solution in disregard of higher crystallinity, which was assumed to be due to hydrophilic characteristics of sodium carboxylate on the end of PET molecular chains. PET was swelled in EG three times more than in water under the same conditions. The dissolution rate constant in ethylene glycolic NaOH solution was seven to eleven times larger than in aqueous solution and the lower the concentration of NaOH was, the more the effect of EG was.

혼방섬유의 적외선분광학적 분석에 관한 연구(I) -T/C혼방섬유의 정량분석-

조환,Cho, Hwan 한국섬유공학회 1971 한국섬유공학회지 Vol.8 No.1

Infrared absorption spectroscopic identifications of various cellulosic, polyester and T/C blended fibers were discussed in this paper. For this method the necessary amount of samples are very small, and identification of textile fibers is generally simple. Detection of functional groups in blended fibers is easily performed by the use of characteristic absorption band. The potassium bromide pressed disc technique was used to study the behavior of the T/C blended fibers in the infrared region. These spectra can be used to measure the content of blended fibers from the ratio of CH stretching band (2900cm-1) of cellulose to C=O stretching band (1720cm-1) of polyester fibers. Absorbance by chemical structures in fiber is function of the transparency of the potassium bromide disc. (Received March 10, 1971)

ビス(β-イソシアナ―トエチル)ジスフィドにより可逆架橋化したレ―ヨン纖維の機械的 性質

曺煥 朝鮮奬學會 1974 學術論文集 Vol.4 No.-

The crosslinking of viscose rayon staple fibers with bis-s-isocyanatoethyl disulfide (BlED) in dimethyl¬formamide at 80°C was studied. From the sulfur contents of the product (DTV) and its reduction product (RDTV), the crosslinking efficiency (the ratio of BlED forming crosslinks to total BlED combined in DTV) was calculated. The efficiency increased with the reaction period and was greater than that for the reaction of of cotton with BlED conducted under similar conditions. Cadoxen solubility test indicated that disulfide cross¬links in DTV were cleaved by reduction with tri-n-butyl phosphine and reformed by successive oxidation with air in buffer. The stress strain behaviors of DTV, RDTV, and its oxidation product (ORDTV) were measured in toluene, water and 50% aqueous urea. The breaking elongation of crosslinked rayon fibers (DTV and ORDTV), in any of the solvents, decreased with increasing crosslinks. The breaking strength and the stress at 30% elongation in toluene changed little by crosslinking. The stress at 3% elongation of the rayon fibers in water and 50% aqueous urea increased remarkably by crosslinking with BlED, decreased to the level of control sample by successive reduction, and increased again by the following recrosslinking by oxidation. The breaking strength of the rayon fiber in 50% aqueous urea increased slightly bycrosslinking. The reversible nature of the mechanical properties of reversibly crosslinked rayon fibers was demonstrated.

제전성 합성섬유의 실험실적 제조

조환,허만우,정원규,Cho, Hwan,Huh, Man-Woo,Chung, Won-Kyu 한국섬유공학회 1979 한국섬유공학회지 Vol.16 No.1

In this paper, the details and preliminary results of the investigations were presented for the use of copolymers of polyamides containing disulfide linkages, sulfhydryl groups and sulfonic acid groups as antistatic agents for nylon 66 filaments. Copoly hexamethylene (3,3'-dithiodipropio-adipo) amide (copoly-HDA) was synthesized from 3,3'-dithiodipropionyl chloride, adipoyl chloride and hexamethylene diamine by an interficial polycondensation method. Conditions for synthesis of the copoly-HDA were discussed. The copoly-HDA and nylon 66 chips were mined in several component ratios and then spun by wet spinning method. The resulting filaments were treated with reducing and oxidizing agents in order to make hygroscopic filaments, Electro-specific resistance of those and nylon 66 filaments were measured in order to discuss their antistaticity. Antistatic effects of copoly-HDA were recognized on those filaments at room temperature, which could be explained by assuming that the disulfide arrangements were made pseudo-conjugated double bond.