본 연구에서는 인체 친화적이고 환경 친화적인 패션제품 소재기획을 위한 기초 자료를 제시하고자 수행되었다. 이를 위해서 4종의 섬유소 소재를 대상으로 염색조건을 달리하여 천연 쪽 염색을 실시하여 색채특성과 색채감성을 평가하였으며, 이러한 특성이 선호도에 미치는 영향을 분석하였다. 쪽 염색된 직물은 모두 중, 저명도와 저채도의 남색(PB)을 구현하였다. 이들 직물의 색채특성은 섬유종류와 염색조건에 따라 유의한 차이를 보였다. 쪽 염색된 직물에 대한 색채감성은 스포티 감성, 클래식 감성, 내추럴 감성 등 3가지 요인으로 분류되었다. 이러한 색채감성은 섬유종류와 염색조건에 따라 부분적으로 유의한 차이를 나타내었다. 또한 쪽 염색 직물의 색채특성과 색채감성 요인 간에는 부분적으로 유의한 상관관계를 보였다. 쪽 염색 직물의 색채 선호도에 영향을 주는 요인으로는 색채감성 요인 중에서 클래식 감성과 스포티 감성, 색채특성에서는 L*값인 것으로 나타났다.

Pb를 흡착처리하기 위해 자외선 유도 그라프트 중합을 사용하여 박테리아 셀룰로스에 아크릴산을 모디피케이션한 흡착제를 제조하였다. 제조된 흡착제는 SEM, FTIRATR등의 기기분석에 의해 평가되었고, 흡착실험 결과를 흡착속도의 거동을 고찰하기 위한 방법으로 pseudo-first-order로 언급되어지는 Benaissa 모델과 pseudo- second-order로 언급되어 지는 Kurniawan 모델에 적용하였다. 제조된 흡착제는 Benaissa 모델에 보다 더 일치함을 보여주었다.

The straight nanopores in cellulose acetate (CA) polymers for battery gel separators were generated by utilizing both Ni(NO3)2·6H2O and water pressure. When polymer film was exposed to water pressure, the continuous nanopores were generated after complexing with Ni(NO3)2·6H2O. These results could be explained by that polymer chains were weakened because of the plasticization effect of the Ni(NO3)2·6H2O incorporated into the CA. The well controlled CA membrane after water pressure treatment enabled fabrication of highly reliable cell by utilizing 2032-type coin cell structure. The resulting cell performance exhibited both the effect of the physical morphology of CA separator and the chemical interaction of electrolyte with CA polymer which facilitates the Li-ion in the cell.

This study was carried out in order to provide useful data for planning fabrics of summer eco-friendly fashion products. The fabrics used in this study were four cellulose fibers: cotton, cotton/mulberry blended, flax, and flax/lyocell blended. Dyeing with natural indigo was carried out under three different reducing conditions (i.e., general, eclectic, and eco-friendly) that have different reducing agent and pH levels, and hydrosulfite and glucose were used as a reducing agent. The dye uptake (K/S value) of fabrics dyed with natural indigo by a reducing condition was the highest at 660nm. Regardless of the fabrics, dye uptake was the highest under the general reducing condition and the lowest under the eco-friendly reducing condition. Under different reducing conditions, the dye uptake of natural indigo fabrics with the maximum absorption wavelength indicated a difference. The colorfastness of cellulose fabrics that were dyed with natural indigo had a rate of 4 to 5 except for rubbing fastness, which indicated good colorfastness. Additionally, natural indigo-dyed cotton and flax fabrics had good antibiosis. When the color characteristics of fabrics dyed with natural indigo were measured, all of the three reducing conditions created purple blue (PB) colors, and the color characteristics of dyed fabrics by reducing condition and fabric showed significant differences.

In this study, cellulose nanoplates (CNPs) were fabricated using cellulose nanocrystals obtained from commercial microcrystalline cellulose (MCC). Their pyrolysis behavior and the characteristics of the product carbonaceous materials were investigated. CNPs showed a relatively high char yield when compared with MCC due to sulfate functional groups introduced during the manufacturing process. In addition, pyrolyzed CNPs (CCNPs) showed more effective chemical activation behavior compared with MCC-induced carbonaceous materials. The activated CCNPs exhibited a microporous carbon structure with a high surface area of 1310.6 m2/g and numerous oxygen heteroatoms. The results of this study show the effects of morphology and the surface properties of cellulose-based nanomaterials on pyrolysis and the activation process.

Cellulose is the most abundant organic polymer constituent of the cell wall of green plants and of various forms of algae. The complexity of lignocellulosic biomass is a major challenge in industrial research. Most mushroom species that naturally grow on soil or wood possess cellulases and the corresponding enzymatic system and, potential candidates for the direct bioconversion of softwood polysaccharides into fermentable sugars. However, there have been fewer studies on mushroom cellulases than on fungi such as Trichoderma spp., exploit the full potential of mushroom cellulases. This review will focus on the current status ofmushroom cellulase research and applications and will provide insight into promising future prospects.

본 연구에서는 환경 친화적 재료를 제조할 목적으로 자연계에 풍부한 bacteri al cellulose를 지지체로 하여 이온교환 특성이 있는 acrylic acid 단량체를 자외선 그라프트 중합법으로 고정시켰다. 이 중합체를 중금속 흡착제로서 막분리 hy brid시스템에 적용하기 위해 모델 용질로 Pb에 대한 흡착거동을 조사하였고 이에 대한 흡착 등온식 및 Benaissa model과 Kurniawan model 속도식을 적용하여 해석하였다.

Cellulose acetate-graft-(glycidylmethacrylate-g-polyethylene glycol) (CA-g- (GMA-g-PEG) was synthesized and incorporated into acetylated methyl cellulose (AMC) to prepare high rejection performance ultrafiltration membranes. H1-NMR and X-ray photoelectron spectroscopy study confirmed the successful synthesis of CA-g-(GMA-g-PEG) and utilized for hydrophilic modification agent. Polyethyleneimine(PEI), HumicAcid(HA) and Citric Acid(CA) ligands was used to bind the metal ions in aqueous solution.The rejection efficiency of AMC/CA-g-(GMA-g-PEG) blend membranes was studied in terms of pH, concentration and time. The successful developments would allow the safe and economical advancement in the fabrication of AMC blend membranes for ultrafiltration applications.

The purpose of this research is to revive the colors of combination dyeing and mixed dyeing with natural dyestuffs. The fabrics used were cotton and rayon. The natural dyestuffs used in this research were indigo, Phellodendron amurense, and Caesalpinia sappan. The effects of combination dyeing were as follows. First, all samples showed deeper colors. Second, according to the results of the surface K/S measurement, while the surface K/S of cotton was over 15, that of rayon was over 17. Third, the results of the light fastness measurement showed the superiority (by over grade 4) of all the samples, except in the case of rayon fiber sample no. 6 (which had been pre-dyed with indigo five times before being dyed with P. amurense once and then being dyed with C. sappan once). In the color fastness to washing measurement, all fibers showed superiority (by over grade 3~4). In addition, the color fastness to dry cleaning of all fibers was satisfactory or excellent (by over grade 3). Fourth, according to the results of the tensile strength measurement, it tended to decrease in the case of cotton and increase in the case of rayon. Fifth, the results of the density measurement showed that the density of cotton decreased by about 15~20% in the case of warp and 10% in the case of weft for all samples. The density of rayon decreased 20% in the case of warp for all samples and increased 30% in the case of weft for all samples.

Cellulose fibers were stabilized by treatment with an electron-beam (E-beam). The properties of the stabilized fibers were analyzed by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis. The E-beam-stabilized cellulose fibers were carbonized in N2 gas at 800°C for 1 h, and their carbonization yields were measured. The structure of the cellulose fibers was determined to have changed to hemicellulose and cross-linked cellulose as a result of the E-beam stabilization. The hemicellulose decreased the initial decomposition temperature, and the cross-linked bonds increased the carbonization yield of the cellulose fibers. Increasing the absorbed E-beam dose to 1500 kGy increased the carbonization yield of the cellulose-based carbon fiber by 27.5% upon exposure compared to untreated cellulose fibers.

Bacterial Cellulose (BC) produced from Acetobacter sp. is used in a wide variety of applications including paper, textile, food, cosmetic, and medicine due to its high mechanical strength, purity, and water holding capacity. In Southeast Asia, coconut water is commonly used as a carbon source for producing BC called “nata de coco”. However, there have been very few attempts to produce BC from juices of other fruit sources, such as pear, apple, and grape, which are major fruits produced in East Asia including South Korea. Since those fruits have relatively low pH because of a large quantity of organic acids, the control of pH is necessary to achieve the maximum BC production yield. The objective of this study was to investigate the BC fermentation characteristics of various fruit juices as media and to determine optimum conditions for the BC production. Sodium acetate was added to each fruit juice medium and the pH was adjusted to pH 5 with acetic acid. Acetobacter xylinus KCCM 41431 was inoculated and BC fermentation was performed for 10 days. The total sugar levels of pear, apple, and grape were 102.31, 155.10, 131.70 g/l and the pHs were 4.72, 4.04, and 3.08, respectively. In buffered fruit juice media, BC production yields were 1.98, 1.44 and 2.55 fold higher than those of pure fruit juice, probably due to the reduction of acid stress. However, the BC production was inhibited at high sodium acetate concentration (>150mM).

Cellulose acetate (CA) has been used for microfiltration/ultrafiltration applications because of its good solubility in common solvents. However, it is sensitive to chemical and physical degradation. Therefore, in this study, cellulose acetate was crosslinked with terephthaloyl chloride (TPC) in dimethylacetamide (DMAc) solution to complement these weakness. Cross-linking was confirmed by increasing in dope solution viscosity and FT-IR. To indicate the chemical resistance, weight loss was observed after the cross-linked CA membranes were immersed in ethanol, hexane, acetone and DMAc solvent for 24h. The physical properties were evaluated by the tensile strength. In the result of experience, effect of the degree of cross-linking by increasing of the concentration of TPC improved the chemical and physical properties of CA.

막분리 공정의 응용범위와 시장규모가 증가함에 따라 효과적인 물질분리를 위해 다양한 분리공정이 이용되고 있다. 이중 정수처리공정에서 수질의 안전성, 자동화 등의 장점 때문에 분리막에 대한 관심이 증가되고 있으며, 정수처리에 사용되는 대부분의 분리막은 강한 내구성, 장수명성 등이 요구되어, 이를 위하여 막오염 저항성이 크게 요구된다. 일반적으로 셀룰로오스 계열은 친수성이 강하며 막오염 저항성이 우수하고 정밀여과막이나 한외여과막 소재로 사용된다. 본 연구에서는 고분자량을 갖는 친수성 소재인 아세틸화된 메틸 셀룰로오스를 사용하여 한외중공사막을 다양한 조건에서 제조하고 제조된 막의 구조적 특성 및 투과분리 특성에 대하여 살펴보았다.

The present work reports a systematic study of using carboxymethylated cellulose (CMC) as water-bornebinder to produce Li4Ti5O12-based anodes for manufacture of high rate performance lithium ion batteries. When theLTO-to-CB-to-CMC mass ratio is carefully optimized to be 8:1:0.57, the special capacity of the resulting electrodes is144 mAh·g−1 at 10 C and their capacity retention was 97.7% after 1000 cycles at 1C and 98.5% after 500 cycles at5C, respectively. This rate performance is comparable or even better than that of the electrolytes produced using con-ventional, organic, polyvinylidene fluoride binder.

This study fabricated low thermal conductive polyacrylonitrile (PAN)-based carbon fibers containing cellulose particles while maintaining their mechanical properties. The high thermal conductivity of carbon fibers limits their application as a high temperature insulator in various systems such as an insulator for propulsion parts in aerospace or missile systems. By controlling process parameters such as the heat treatment temperature of the cellulose particles and the amount of cellulose added, the thermal and mechanical properties of the PANbased carbon fibers were investigated. The results show that it is possible to manufacture composite carbon fibers with low thermal conductivity. That is, thermal conductivities were reduced by the cellulose particles in the PAN based carbon fibers while at the same time, the tensile strength loss was minimized, and the tensile modulus increased.

Cellulose is the most useful feedstock in the world that could be used to prepare new kinds of materials, and cellulose derivatives have potential application as functional polymers. Due to the present of hydroxyl groups, cellulose is considered to be an excellent material for surface modification. Among the chemical modification method, Graft copolymerization is a well-established and commonly used technique for modification of polymer surface. In this study, sulfonated GMA-g-cellulose ion exchange fibers were synthesized by gamma-ray mutual radiation. The conversion of epoxy groups into the functional groups was investigated. Factors affecting on grafting process such as radiation dose, monomer concentration, added salt and cross-linking agent were studied.

셀룰로오스 에테르의 분자량, 첨가량, 치환도 및 치환체 종류, 물 양이 쌀면의 조리특성에 주는 영향을 살펴보기 위해 자외선 가시광선 분광분석기를 이용하여 조리 후 쌀면 국물 탁도 를 측정하고 유변물성 측정기를 이용하여 쌀면의 압축강도를 측정하였다. HPMC의 분자량 및 물 양이 증가할수록 국물의 탁도가 감소하여 조리 시 쌀면의 형태안정성이 향상되었고, 셀룰로오스 에테르 첨가량, 치환체 종류, 치환도에 따라 탁도 값이 변화하여, 이들 인자 모두가 쌀면의 형태안정성에 영향을 준다는 것을 확인하였다. 또한, 이들 인자를 효과적으로 조절할 경우, 밀면을 조리한 국물의 탁도보다 낮은 탁도값이 얻어져 셀룰로오스 에테르의 첨가에 따라 조리 시 쌀면의 형태안정성이 크게 향상됨을 확인하였다. 유변물성 측정기를 이용한 쌀면의 압축특성 측정은 조리시간에 따른 쌀면의 호화정도 및 변화하는 조직감을 살펴보는 데 효과적이였으며, 물 양 및 셀룰로오스 에테르의 분자량이 다른 인자들에 비하여 조리시간 별 쌀면의 호화특성 및 조직감에 큰 영향을 주는 것으로 나타났다.

본 연구에서는 셀룰로오즈 아세테이트(Cellulose acetate)를 이용하여 정삼투막을 제조하였으며 분리막 성능평가를 진행하였다. 분리막의 염제거율과 정삼투 공정에서의 투과성능 변화의 상관관계를 규명하기 위해 각기 다른 염제거율을 가지는 분리막을 제조하고 정삼투 장치를 이용하여 막 투과 성능을 평가하였다. 분리막의 구조가 정삼투 투과성능에 미치는 영향을 알아보기 위해 각기 다른 용매를 이용하여 분리막을 제조하였다. 또한 제조된 분리막의 구조는 주사전자현미경(scanningelectron microscopy)을 통해서 확인하였으며 정삼투 장치 운전을 통해 투과성능 변화를 알아보았다.

본 연구에서는 유변물성측정기를 이용하여 HPMC 첨가량, 물 양, HPMC 분자량, 셀룰로오스 에테르 치환체 및 치환도가 쌀 반죽의 압축 및 접착 특성에 미치는 영향에 대해 살펴보았다. HPMC 첨가량이 증가함에 따라 접착강도는 꾸준히 증가하였으나, 압축강도는 2% HPMC 첨가량에서 최대 강도를 보였다. HPMC의 분자량이 증가하거나, 물 양이 감소할수록 쌀 반죽의 압축강도 및 접착강도가 증가하는 결과를 보였다. 이들 인자 외에도, 셀룰로오스 에테르의 치환체 및 치환도도 쌀 반죽의 압축강도 및 접착 강도를 결정하는 중요한 인자임을 확인하였다.

Microbial fermented cellulose gel, citrus gel(CG), was successfully fabricated to porousfoam by radiation treatment and freeze drying. The chemically induced radiation was used to createhighly porous foam and further freeze drying of the CG produced tough foams with interconnectedopen pores for use in tissue engineering. The microstructure of the CG foam was controlled byvarying the irradiation dose and quenching temperature with pore size ranging from several micronsto a few hundred microns. Tensile strength and Gurley value of the CG foam were influenced byirradiation dose. These radiation induced CG foams are promising scaffolds for tissue engineering.