• Fibers and Polymers
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• 제5권1호
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• pp.44-51
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• 2004

Three bi-functional reactive dyes such as Bis(vinylsulphone) type, Bis(monochlorotriazine) type and Bis(mononicotinotriazine) type were applied to regular viscose rayon and new regenerated cellulosic fiber ($enVix^ⓡ$) which was prepared from cellulose acetate fiber by the hydrolysis of acetyl groups, and their dyeing properties and fastness properties were compared. enVix exhibited better dyeability and fastness than regular viscose rayon and these results were also explained by the differences in the supramolecular structure of these two fibers.

• Membrane and Water Treatment
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• 제10권3호
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• pp.213-221
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• 2019

Anaerobic digestion (AD) has been widely used to valorize food waste (FW) because of its ability to convert organic carbon into $CH_4$ and $CO_2$. Korean FW has a high content of fruits and vegetables, and efficient hydrolysis of less biodegradable fibers is critical for its complete stabilization by AD. This study examined the digestates from different anaerobic digesters, namely Rs, Rr, and Rm, as the inocula for the AD of vegetable waste (VW) and cellulose (CL): Rs inoculated with anaerobic sludge from an AD plant, Rr inoculated with rumen fluid, and Rm inoculated with anaerobic sludge and augmented with rumen fluid. A total of six conditions ($3\;inocula{\times}2\;substrates$) were tested in serial subcultures. Biogas yield was higher in the runs inoculated with Rm than in the other runs for both VW (up to 1.10 L/g VS added) and CL (up to 1.05 L/g VS added), and so was biogas production rate. The inocula had different microbial community structures, and both substrate type and inoculum source had a significant effect on the formation and development of microbial community structures in the subcultures. The overall results suggest that the bioaugmentation with rumen microbial consortium has good potential to enhance the anaerobic biodegradability of VW, and thereby can help more efficiently digest high fiber-content Korean FW.

• Composites Research
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• 제35권3호
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• pp.153-160
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• 2022

목재 섬유 기반의 셀룰로오스 나노피브릴(cellulose nanofibrils, CNF)은 생체적합특성이 우수하여 조직 공학용 스캐폴드, 약물 운반체, 상처 치유용 겔 등의 생체 의료 분야에서 많은 관심을 받고 있다. 하지만, 셀룰로오스 나노피브릴은 상대적으로 약한 기계적 강도를 나타내기 때문에 높은 기계적 특성을 요구하는 응용 분야에 사용되기 어렵다는 한계를 가지고 있다. 따라서 본 연구에서는 셀룰로오스 나노피브릴의 기계적 강도를 향상시키기 위해 TEMPO (2,2,6,6-tetramethylpiperidin-oxyl) 산화 처리된 셀룰로오스 나노피브릴에 금속 양이온을 도입하여 금속-카르복실레이트 배위 결합을 가지는 하이드로겔을 제조하였다. 또한, 큰 진폭 진동 전단(large amplitude oscillatory shear) 측정과 Live/Dead 세포 시험을 통해 하이드로겔의 비선형 점탄성 거동과 세포 생존 능력을 분석하였다. 특히, 첨가된 금속염의 종류에 따라 세포의 증식 및 생존 능력이 변화하였고, 이는 하이드로겔들의 유변 물성 특성에도 영향을 미쳤다.

• 한국추진공학회지
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• 제23권5호
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• pp.36-42
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• 2019

본 연구에서는 리오셀 섬유를 사용하여 탄소직물을 제조함에 있어, 인계 난연제인 Phosphoric Acid(PA)와 가교제인 Melamine resin (MR)을 사용하여 섬유의 전처리를 수행하고 TGA, FT-IR, XRD, 중량 분석을 통하여 물리적, 화학적 구조 변화에 대하여 고찰하였다. 전처리를 통하여 내염화 및 흑연화된 직물의 경우 미처리 직물과 비교하여 중량 수율이 14.7%, 직물 폭과 길이의 수율이 각각 15%, 15.5% 증가함을 확인하였다. 이러한 결과는 셀룰로오스의 탈수반응을 촉진과 함께 섬유 표면에 char를 형성하고, 셀룰로오스 분자 내의 가교반응을 유도하여 내염화 시 안정한 구조 형성에 의한 효과로 설명할 수 있다.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2007년도 학술발표회 논문집
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• pp.245-246
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• 2007

• 한국응용과학기술학회지
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• 제27권2호
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• pp.168-174
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• 2010

In this research, an effective method for reducing the fibrillation of lyocell fibers, which are spun from a solution of cellulose in N-methyl morpholine-N-oxide(NMMO), through consecutive chemical treatments. Undried solution-spun cellulosic fiber was firstly treated with 10 to 30 wt% of multifunctional crosslinking agents, such as ethylene glycol poly(3-chloro-2-hydroxypropyl) ether, and then dipped into alkaline solution to introduce epoxy functions. Finally steam condition was applied to occur a chemical crosslinking in order to reduce the fibrillation on the surface of fibers. Fibrillation was also reduced significantly by adding extra $Na_2SO_4$ in NaOH solution. In addition, Antifibrilllated lyocell fibers show the slightly higher dyeability(4 %) to Cibacron Blue without serious reduction of mechanical properties.

• Fibers and Polymers
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• 제5권3호
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• pp.219-224
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• 2004

The reactive printing properties of regular viscose rayon and a new regenerated cellulosic fiber (en Vix^{\textregistered}$) which was prepared from cellulose acetate fiber was investigated in a comparative manner. From the results, it was found that en Vix exhibited better printing properties than regular viscose rayon. It showed stable final color yields, irrespective of the amount of thickener, hence reproducibility of printing of en Vix is expected to be excellent. In addition, urea requirements were less for the printings on en Vix than for the corresponding printing on viscose rayon. Therefore, en Vix is also expected to reduce the amount of the urea which causes environmental problems in dyehouse effluent.

• 접착 및 계면
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• 제14권1호
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• pp.21-27
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• 2013

셀룰로오스계 레이온섬유 또는 레이온직물은 좁은 온도범위의 안정화공정 동안에 열분해가 매우 빠르게 진행된다. 그러므로 레이온계 탄소섬유를 제조하는데 있어 안정화단계는 매우 중요한 핵심공정이다. 따라서 본 연구에서는 셀룰로오스계 레이온직물의 중량감소, 화학조성, 미세구조 및 texture 변화에 미치는 등온 안정화공정과 초음파세척의 영향을 조사하였다. $200{\sim}240^{\circ}C$ 영역에서 행한 등온 안정화공정의 온도는 레이온직물을 안정화 소요시간, 탄소함량, 산소함량, 셀룰로오스 구조 변화 그리고 직물 texture에 큰 영향을 주었다. 등온 안정화공정 전에 물을 이용한 초음파세척은 레이온직물의 안정화공정 시간을 단축하고, 안정화 후 직물의 탄소함량을 증가하고, 산소함량을 감소시키며, XRD 분석 패턴을 변화시키는데 역할을 하는 것으로 조사되었다. 또한 초음파세척은 등온 안정화공정시 발생하는 레이온직물의 빠른 중량감소 현상을 더디게 하고, 열수축을 감소시켜, 직물의 급격한 물리적 변화의 완화에도 기여하는 것으로 사료된다.

• 한국염색가공학회지
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• 제30권1호
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• pp.20-28
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• 2018

The near infrared ray camouflage fabric has a near infrared ray reluctance similar to the surrounding environment and has a camouflage effect on the surrounding environment. Synthetic fibers used in military uniforms are difficult to have gastrointestinal function as general commercial dyes, unlike cellulose fibers, which use some commercial vat dyes to impart infrared gastrointestinal function. In this study, we optimized the adsorption pH, temperature and time for NIR dye application for polyester fabrics, and established the optimum concentration for the evaluation of adsorption build-up characteristics. In addition, it is difficult to adsorb it since the polyester material has a dense crystal structure and the NIR dye is bulky. Therefore, a swelling agent used for dyeing meta-aramid fibers with high Tg and high crystallinity was introduced as a separate preparation to increase the affinity to polyester, which is a hydrophobic fiber, to thereby obtain an excellent adsorption rate. As a result of comparing before and after using swelling agent, the adsorption rate difference was 10 times or more when compared with before.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2003년도 The Korea-Japan Joint Symposium
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• pp.15-16
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• 2003

When textiles are buried in soil, soil resident microorganisms take part in degradation of textile material, which is called biodegradation, and the biodegradability is often used as a standard for the environment-friendliness of textile products.(omitted)