• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2000년도 봄 한국섬유공학회 학술발표회 논문집(Proceedings of the Korean Textile Conference)
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• pp.17-20
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• 2000

• The International Journal of Costume Culture
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• 제6권2호
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• pp.134-146
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• 2003

Polyester of linear homopolymer poly(ethylene terephthalate)(PET) was chemically modified through the formation of branched copolymer to improve the undesirable properties of fiber. Photo-induced graft copolymerization of the acrylic monomers acrylic acid (AA) and methyl acrylate (MA) in the liquid and vapor phase, respectively, onto N,N-dimetylformamide (DMF)-pretreated PET fibers was carried out. The effect of various synthesis conditions and DMF pretreatment of the PET on the graft yield was investigated. Grafting mechanism was analysed. The grafting was promoted by increasing DMF pretreatment temperature and amount of DMF retention in the fiber. The increasing biacetyl and monomer flow time, and irradiation time enhanced the grafting up to a certain amount and thereafter it decreased.

• 한국염색가공학회지
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• 제24권2호
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• pp.97-105
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• 2012

Compared with conventional adsorption-based coloration, the photoreactions of dyes such as photo-copolymerization and photo-crosslinking under UV irradiation can be employed for the coloration of textiles, which can be carried out without salt addition at room temperature. C.I. Reactive Black 5, a homo-bifunctional reactive dye containing two sulfatoethylsulfone groups, is used as a photo-reactive dye for wool fibers. Upon UV irradiation, the photo-reactive dye was grafted onto wool fabrics without photoinitiators. Since the disulfide bonds in the cystine residues of wool can be easily photodecomposed to active thiyl radicals which initiate the polymerization, the dye can be polymerized to an oligomeric dye of a degree of polymerization of 12 or more. The grafted fabrics reached a grafting yield of 2.3% o.w.f. and a color yield (K/S) of 18.2 by the photografting of an aqueous dye concentration of 9% using a UV energy of 25J/$cm^2$. Furthermore, the photochemically dyed wool fabric showed higher colorfastness properties to light, laundering and rubbing comparable to conventional reactive dyeing.

• 한국응용과학기술학회지
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• 제34권3호
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• pp.650-656
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• 2017

The water-swollen hydrogels containing silicone or fluorine were prepared by copolymerization of 2-hydroxy ethyl methacylate (HEMA) with 3-(trimethoxysilyl)propyl methacrylate(SM) or 2,2,2-trifluoroethyl acrylate(FA). When the content of SM or FA increased in copolymers, there was tendency of water absorbance to decrease, whereas contact angles to increase. The hydrogels containing FA showed 2 ~ 4% higher water content and 4 ~ 5% lower contact angles compared to that of SM. Tensile strengths decreased as the content of SM increased. However, FA exhibited strength of $2.2Mpa/cm^2$ which is similar to $2.3Mpa/cm^2$ of B. FA, which implies comparatively low adherence, hence, showed better protein resistance properties than SM-based hydrogel. The photo-polymerization was also applied instead of thermal polymerization to enhance the energy efficiency. As a result, the reaction yield reached over 95% within 1 minute.

• Fibers and Polymers
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• 제1권1호
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• pp.1-5
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• 2000

Poly(3-methyltetrahydrofuran)(3-MTHF) and poly(tetrahydrofuran-co-3-MTHF), having very narrow molecular weight distribution were successfully synthesized via photo-induced living cationic polymerization in the presence of diphenyliodonium hexafluorophosphate. Linear relationship between % conversion and number average molecular weight of resulting poly(3-MTHF) in the polymerization of 3-MTHF, carried out at -22$^{\circ}C$, indicates that the 5-membered cyclic oxonium ion, being responsible for the cationic propagation is stabilized by ion pall formation with hexafluorophosphate anion, supplied from the salt. The linear relationship between two parameters, mentioned above was also observed in the copolymerization of 3-MTHF with THF, carried out at 0 and -22$^{\circ}C$. The molecular structures including the copolymer composition and average molecular weight and its distribution is determined by reaction parameters such as monomer feed ratio and reaction temperature.

• 대한화학회지
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• 제64권2호
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• pp.74-78
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• 2020

산성 영역에서 작동하는 고감도 형광 pH 센서막을 제조하기 위하여 실란화된 유리 표면 상에 push-pull 공액 염료(DCMP)를 공유결합에 의해 고정화하였다. DCMP 유도체(DCMA), 2-hydroxyethyl methacrylate (HEMA)및 triethylene glycol dimethacrylate의 혼합물을 광개시 공중합하여 pH 감응성 형광센서막을 제조하였다. 분광학적 측정 결과, pH 2.0-5.0 사이에서 pH가 증가함에 따라 센서막의 흡광도가 증가하였으며, 같은 pH 범위에서 pH 증가에 따라 센서막의 형광 세기도 약 50배 정도 증가하였다. 산성 조건에서 pH 변화에 대한 센서막의 감응은 가역적이고 재현성이 우수하였다. 또한 센서막은 20-50초 사이의 비교적 짧은 감응 시간과 여러 금속이온 존재에서 수소 이온에 대해 높은 선택성을 나타내었다.

• 공업화학
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• 제3권1호
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• pp.172-178
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• 1992

$F^{3+}(FeCl_3{\cdot}6H_2O)$을 광증감제로 하여 Chitosan 필름에 아크릴로니트릴 단량체를 수용액상에서 자외선 조사하여 그라프트 공중합시켰다. 그라프트 공중합체의 확인은 IR 스펙트럼과 전자 현미경으로 행하였다. 단량체의 농도, 광증감제의 농도, 중합반응시간, 중합반응온도 등 여러 중합반응의 파라미터를 조사하였다. 단량체의 농도와 광증감제의 농도가 증가할수록 퍼센트 그라프팅은 증가하였으며 중합반응시간과 중합반응온도가 증가하여도 퍼센트 그라프팅은 증가하였다.

• 한국의류학회지
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• 제7권1호
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• pp.11-16
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• 1983

Variance of whiteness after graft copolymerization of acrylonitrile, methylmethacrylate and acrylamide onto bleached cellulose using Ce(IV) salt as initiators and the effect of homopolymer on the grafted fibers by photo-irradiation were studied. Also, the development of Yellowing were determined after carbon-arc radiation in a Fade-o-meter. The results were as follows: (1) Variation of whiteness of grafted cellulose fibers were influenced by graft-ratio, Inorganic-Organic Balance (IOB) of functional group in used monomers and adhering homopolymers on the grafed fibers. (2) Yellowing was not affected by the concentration of Ceric Ammonium Nitrate directly during reaction (eg. 0.008>0.006>0.014 M).