• Korean Journal of Microbiology
• /
• v.6 no.3
• /
• pp.87-91
• /
• 1968

To research the characteristics of cellulose produced from one strains of Rhizopus(R-B 14) when it acts on the carboxyl methyl cellulose, this experiment was carried out in crude purified cellulose. The results obtained were as follows: 1. The optimum pH of cellulose was from 4. 5 to 5 .5 and the range of its stability to the pH was considerably extensive and it was from 4 to 7. 2. The optimum temperature of cellulose was $50^{\circ}C$ and the activity of it was instantly inactivated at $70^{\circ}C$. 3. The inhibition of the metal ions to the activity of cellulose was as follows; $Hg^{++}$ > $Ag^+$ +/ > $Fe^{+++}$ > $Pb^{++}$. But the activity of cellulose was not affected at all by $Na^+$, $K^+$ and $Mg^{++}$.

• Proceedings of the Korean Fiber Society Conference
• /
• 2000.04a
• /
• pp.125-128
• /
• 2000

Chemical cellulose from an ascidian tunic is isolated by extraction, digestion and bleaching steps. The content of $\alpha$-cellulose was above 98 wt%, and it's DPw was about 918. A new regenerated cellulose fiber from the chemical cellulose obtained in this study was made using NMMO/water(87/13 wt%) as a solvent by dry jet-wet spinning. The effects of spinning speed and cellulose content of spinning dope on the properties were investigated.

• Journal of Korea Technical Association of The Pulp and Paper Industry
• /
• v.29 no.3
• /
• pp.51-59
• /
• 1997

Dissolving pulp is a low yield(30∼35%) bleached chemical pulp that has a high cellulose content (95% or higher) suitable for use in cellulose derivatives such as rayon, cellulose acetate. This research was studied for dissolving pulp preparation as the raw material of viscose rayon from commertial pulps. (TMP, CP, DIP) In the change of pulp(cellulose) characteristics after sodium hypochlorite and solvolysis treatment. the following results were obtained In the case of sodium hypochlorite pretreatment, we have obtained pulp that high purity cellulose, but degree of polymerization was inclined to decrease less than 170∼240. Comparing sodium hypochlorite pretreatment and solvolysis pretreatment, solvolysis pretreatment is superior to sodium hypochlorite process for making dissolving pulp. We think that the low degree of polymerization of cellulose because of increasing degradation of cellulose during delignification treatment.

• Textile Coloration and Finishing
• /
• v.6 no.2
• /
• pp.63-70
• /
• 1994

최근, Courtaulds Fiber Ltd.사에 의해 개발된, 새로운 용제방사(瑢劑紡絲) cellulose fiber인 Tencel에 대한 관심이 고조되고 있다. 이 글에서는, 먼저 Tencel의 고기능 특성을 cellulose섬유의 구조적 성질과 관련지어 언급코져 한다. 다음으로, 중공섬유막(hollow fiber membranes), sponge, 부직포와 bacterial cellulose, 그리고, 그 들 cellulose로부터 유래된 새로운 상품과 그 응용의 광범위한 분야를 서술하고져 한다. 그 외에, cellulose fibers와 fabric에 대한 가능성 후처리기술들의 최근의 동향도 기술하고져 한다. 끝으로, 생분해성 plastic과 super섬유로서의 cellulose의 특성, 그리고 장래 그들의 기술적 전망도 부언하고져 한다.

• Textile Coloration and Finishing
• /
• v.10 no.5
• /
• pp.19-23
• /
• 1998

In this study, Cellulose-Poly(Ethylene-Co-Vinyl Alcohol) (EVOH) fibers from MMNO(N-me-thylmorpholine-N-oxide) /water/cellulose/EVOH were prepared according to changes of EVOH content(wt％), which is main factors to dry-jet wet spinning. The mechanical properties and morphology of produced fibers were investigated. The resultant fibers had tensile strength of 3.7∼4.5g/d, elongation of 3.3∼7.5% and exhibited lower density than the density of pure cellulose fiber.

• Textile Coloration and Finishing
• /
• v.5 no.2
• /
• pp.139-143
• /
• 1993

The effects of air-gap distance on properties of cellulose fiber spun from the 6 wt% solution of cellulose in monohydrate N-methylmorpholine N-oxide (NMMO) were investigated. The diameter of fiber spun was drastically reduced in 10 cm of air-gap distance at fixed drawing speed, however, no great change was observed beyond 40 cm. As the distance lengthened, the Cellulose II structure was first appeared and followed by Cellulose II and IV mixed morphology. Also the degree of crystallinity and the size of crystals were tending to decrease.

• The Korean Journal of Zoology
• /
• v.15 no.3
• /
• pp.101-104
• /
• 1972

A simple and economical method for separation of lactate and malate dehydrogenase isozymes is described in detail. The method is based on cellulose acetate strip electrophoretic separation of the isozymes, tetrazolium reduction to purple formazan. Resolution is as good as in the experiment using expensive equipments.

• KCI Concrete Journal
• /
• v.12 no.1
• /
• pp.79-89
• /
• 2000

This research developed an accelerated curing processe for cellulose fiber reinforced cement composites using vigorous reaction between carbon dioxide and cement paste. A wet-processed cellulose fiber reinforced cement system was considered. Carbonation curing was used to complement conventional accelerated curing. The parametric study followed by optimization investigation indicated that the carbonation curing can enhance the productivity and energy efficiency of manufacturing cellulose fiber reinforced cement composites. This also adds environmental benefits to the technical and economical advantages of the technology.

• Journal of the Korean Wood Science and Technology
• /
• v.23 no.4
• /
• pp.117-120
• /
• 1995

• Journal of The Korean Society of Grassland and Forage Science
• /
• v.5 no.1
• /
• pp.84-89
• /
• 1985

Chemical composition, dry matter and cellulose digestibilities and fermentation rates of alfalfa and orchard grass cut at different time were estimated in vitro method and the results summurized as follows: 1. Crude protein, crude fiber cwc and cellulose content of Alfalfa were decreassed as advancing cutting time. Crude protein, crude fiber and cwc content of Orchard grass were decreased as advancing cutting time up to 3 cutting, but crude protein was slightly increased at 4th cutting, crude fiber and cellulose content were higher at 2nd cutting, but decreased thereafter. 2. DM digestibility of Alfalfa was 51.80, 51.86, 52.92 and 59.52% at 1, 2, 3 and 4th cutting time, respectibly, thus slightly increased as advancing cutting time, and cellulose digestibility of Alfalfa was not much different with different cutting time. DM digestibility of Orchard grass was 62.21, 66.10, 60.95 and 66.32% at 1, 2, 3 and 4th cutting time, respectibly, and cellulose digestibility of Orchard grass was slightly increased at 3rd cutting time and then increased at 4th cutting time. 3. Fermentation rate of DM of alfalfa was the highest 1st cutting time (0.83%/hr.) and was not different at 3 and 4th cutting time. Cellulose fermentation rate of Alfalfa was the highest at 1st cutting time (1.29%/hr.), decreased at 2 and 3th and then increased at 4th cutting time. Fermentation rate of DM of Orchard grass was 1.42, 1.58, 1.60 and 1.57%/hr. and of cellulose was the highest at 2nd cutting time (1.77%/hr.)