• Journal of the Korea Institute of Building Construction
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• v.11 no.5
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• pp.419-425
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• 2011

Topping concrete that is not reinforced with rebar to prevent poor tensile performance is vulnerable to cracking. In this study, jute, which is known to be an excellent natural fiber material for strengthening concrete performance, was compared with other cellulose fibers in terms of its capacity to reduce the cracking of concrete. As a result, it was found that compared with concrete using other fibers, concrete using jute fiber showed more than a 50 % reduction of plastic shrinkage crack resistance with the contents of 0.9 kg/$m^3$ and 1.2 kg/$m^3$ for. For impact strength tests, the final destruction of WF and PULP fibers took up to 5 times the number of falls, while jute has 10-18 circuitry, showing excellent ductility properties.

• Korean Journal of Food Science and Technology
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• v.42 no.6
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• pp.743-749
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• 2010

The present study was conducted to evaluate the effects of resistant starches (RS2, RS3) on weight change and defecation states in rats with constipation induced by loperamide. Sixty male Sprague-Dawley rats were divided into the following six groups: normal control-5% cellulose (NC), constipated-5% cellulose (CC), constipated-5% pectin (CP), constipated-5% RS2 (CR2), constipated-8% RS2 (CR2-H) and constipated-5% RS3 (CR3). The animals were fed AIN76-based experimental diets for 5 weeks. Supplementation of RS2 and RS3 resulted in significantly lower feed efficiency ratios and body weight gain as compared to cellulose supplemented group. Large intestine length was significantly longer in the resistant starch and cellulose groups than in the pectin group. Relative fecal weight to feed intake was significantly higher in the RS3 resistant starch group than in the pectin group, and the appearance of feces was similar to that of the cellulose group. Supplementation of RS3 or cellulose significantly shortened gastrointestinal transit time in the constipated rats as compared to pectin. The results of the present study demonstrated that resistant starch supplementation, especially RS3, may help in depress body weight gain and alleviate constipation through an increase of fecal weight and shortening gastrointestinal transit time in constipated animals.

• Fiber Technology and Industry
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• v.3 no.3_4
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• pp.120-133
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• 1999

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2003.04a
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• pp.132-136
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• 2003

최근 셀룰로오스 섬유에 대해 위생적이고 건강성을 강조하는 항균 방취 가공을 부여하기 위한 연구가 활발히 진행되고 있다. 지구상에서 생물체에서 얻는 키틴은 셀룰로오스 다음으로 그 생산량이 많은 천연고분자 물질이다. 키토산은 키틴을 탈아세틸화 함으로써 얻어지는 다수의 아미노기를 갖는 천연다당계열의 생체적합성, 생분해성 고분자이다. 특히 키토산은 우수한 항균ㆍ방취 기능성 부여와 대전방지등의 효과를 나타내어 우수한 가공제로 사용된다. (중략)

• Textile Coloration and Finishing
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• v.6 no.1
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• pp.44-48
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• 1994

Cellulose triacetate(CTA) liquid crystal solutions obtained via dissolution of CTA in solvent mixture of triflucroacetic acid and methylene chloride were spun and saponified in various chemicals. Among chemicals, methanol/sodium hydroxide mixture endowed highest tenacity as well as modulus to regenerated cellulosic fiber and the fiber thereof showed Cell I or Cell IV morphology, or mixed morphology of Cell I and IV.

• Composites Research
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• v.36 no.2
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• pp.126-131
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• 2023

Growing environmental concerns regarding pollution caused by conventional plastics have increased interest in biodegradable polymers as alternative materials. The purpose of this study is to develop a 100% biodegradable nanocomposite material by introducing organic nucleating agents into the biodegradable and thermoplastic resin, poly(lactic acid), to improve its properties. Accordingly, cellulose nanofibers, an eco-friendly material, were adopted as a substitute for inorganic nucleating agents. To achieve a uniform dispersion of cellulose nanofibers (CNFs) within PLA, the aqueous solution of nanofibers was lyophilized to maintain their fibrous shape. Then, they were subjected to primary mixing using a twin-screw extruder. Test specimens with double mixing were then produced by injection molding. Differential scanning calorimetry was employed to confirm the reinforced physical properties, and it was found that the addition of 1 wt% CNFs acted as a reinforcing material and nucleating agent, reducing the cold crystallization temperature by approximately 14℃ and increasing the degree of crystallization. This study provides an environmentally friendly alternative for developing plastic materials with enhanced properties, which can contribute to a sustainable future without consuming inorganic nucleating agents. It serves as a basis for developing 100% biodegradable green nanocomposites.

• Polymer Science and Technology
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• v.7 no.1
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• pp.41-52
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• 1996

• Composites Research
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• v.35 no.3
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• pp.153-160
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• 2022

Cellulose nanofibrils (CNF) based on wood pulp fibers are gained much attention as part of biocompatible hydrogels for biomedical applications such as tissue engineering scaffolds, biomedicine, and drug carrier. However, CNF hydrogels have relatively poor mechanical properties, impeding their applications requiring high mechanical integrity. In this work, we prepare 2,2,6,6-tetramethylipiperidin-oxyl (TEMPO) oxidated cellulose nanofibrils hydrogels mediated with metal cations, which form the metal-carboxylate coordination bonds for enhanced mechanical strength and toughness. We conduct the large amplitude oscillatory shear (LAOS) test and Live/dead cell assay for obtaining nonlinear viscoelastic parameters and cell viability, respectively. In particular, the cell proliferation and viability change depending on the type of metal salt, which also affected the rheological properties of the hydrogels.

• The Science & Technology
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• v.32 no.9 s.364
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• pp.21-21
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• 1999

누에는 4천8백년이나 거슬러 올라간 옛날부터 뽕나무잎의 셀룰로오스를 소화하여 가느다란 명주실을 토해냈다. 유럽의 과학자들은 금세기 초 실크를 모방한 인조견사를 얻어냈고 현대에 이르러서는 석탄ㆍ물과 공기로부터 나일론을 얻었다. 섬유의 발달은 자연모방으로부터 이루어져 최근에는 색깔이 때때로 변하는 카멜레온 섬유가 등장하여 패션소재로 인기를 끌고 있다.

• Proceedings of the Korean Fiber Society Conference
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• 1999.10a
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• pp.17-20
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• 1999