• Title/Summary/Keyword: 셀룰로오스 종이

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Characterization of Chemical Composition and Thermal Behavior of Biomass Originated from Tobacco Industry (담배산업유래 바이오매스의 화학성분 및 열분해 특성 평가)

  • Sung, Yong Joo;Seo, Yung Bum
    • Journal of the Korean Wood Science and Technology
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    • v.36 no.6
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    • pp.138-146
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    • 2008

  • The chemical compositions, cell wall biopolymers and non-isothermal behavior of the stem biomass of Nicotiana Tabacum originated from tobacco industry were investigated in depth. On a weight basis, the contents of total ash and total sugar are 19.1% and 20.7% respectively. Lignin content was around 3% of tobacco stem biomass while pectin was over 7%. The holo-cellulose content in cell wall biopolymer was around 13% and the $\alpha$-cellulose constitutes 60% of the total holo-cellulose. The thermal behavior of stem biomass showed different patterns depending on either inert (nitrogen) or oxidizing (air) atmospheric condition. In the air atmosphere, the rapid thermal decompositions at around $473^{\circ}C$ and $581^{\circ}C$ were recorded as the peaks in DTG curve, while the peaks were not shown in the nitrogen atmosphere condition. The thermal analysis of the freeze dried soluble obtained from hot water extraction of tobacco stem biomass showed that the rapid thermal decomposition at around $581^{\circ}C$ in the air atmosphere was due to the residual char originated from the soluble fraction. The distinct difference in thermal decomposition between hemicellulose and cellulose were easily found in the DTG curve obtained in the nitrogen atmosphere.

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Consolidation and Adhesion of Cellulose Nitrate of Folklore Artifacts in the 19~20th Century (19~20세기 생활민속자료에 사용된 셀룰로오스 나이트레이트의 강화와 접착 연구)

  • Oh, Joon Suk;Lee, Sae Rom;Hwang, Min Young
    • Journal of Conservation Science
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    • v.34 no.6
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    • pp.459-470
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    • 2018

  • Cellulose nitrates were used for folklore artifacts(ornamental beads and pipes in hatstrings, frames of eyeglasses, ornamental eyeglass cases, headband ornaments, and jeogori buttons) between the 19th and 20th centuries; however, they are susceptible to cracking, crazing, embrittlement, and crumbling due to deterioration. To consolidate and adhere deteriorated cellulose nitrate folklore artifacts, water-soluble acrylic emulsion adhesives were investigated. For consolidation, Plextol D 498, which has the lowest viscosity in low concentrations, was used. In adhesive films whose glass transition temperature(Tg) is lower than room temperature, the tensile stress and modulus decreased and the strain increased; therefore, the flexibility was high. The Plextol D 498 and Plextol D 498 and Dispersion K 52 films maintained their adhesiveness and flexibility after artificial-sunlight-accelerated ageing, and Plextol D 498 and Dispersion K 52 films hardly caused yellowing. Plextol D 498 was the most stable for accelerating ageing. A low concentration of Plextol D 498 emulsion resulted in the best permeability on the surface of cellulose nitrate, compared with other acrylic emulsions. To prevent ornamental hatstrings from cracking, crazing, embrittlement, and crumbling, a Plextol D 498 emulsion was used. After applying low concentrations(1%, 3%) of the emulsion to consolidate the fragments and high concentration to adhere the fragments, the ornamental hatstrings were protected from crumbling by deterioration, and their fragments were well-adhered. To preserve it from deterioration by oxygen and humidity, the treated ornament was sealed with an oxygen-barrier film using a low-humidity oxygen scavenger.

  • https://doi.org/10.12654/JCS.2018.34.6.02 인용 PDF KSCI

Preparation of Cellulose Nanofibrils and Their Applications: High Strength Nanopapers and Polymer Composite Films (셀룰로오스 나노섬유의 제조 및 응용: 고강도 나노종이와 고분자복합필름)

  • Lee, Sun-Young;Chun, Sang-Jin;Doh, Geum-Hyun;Lee, Soo;Kim, Byung-Hoon;Min, Kyung-Seon;Kim, Seung-Chan;Huh, Yoon-Seok
    • Journal of the Korean Wood Science and Technology
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    • v.39 no.3
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    • pp.197-205
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    • 2011

  • Cellulose nanofibrils (CNF) with 50~100 nm diameter were manufactured from micro-size cellulose by an application of a high-pressure homogenizer at 1,400 bar. High strength nanopapers were prepared over a filter paper by a vacuum filtration from CNF suspension. After reinforcing and dispersing CNF suspension, hydroxypropyl cellulose (HPC) and polyvinyl alcohol (PVA)-based composites were tailored by solvent- and film-casting methods, respectively. After 2, 4, 6 and 8 passes through high-pressure homogenizer, the tensile strength of the nanopapers were extremely high and increased linearly depending upon the pass number. Chemical modification of 1H, 1H, 2H, 2H-perfluorodecyl-triethoxysilane (PFDTES) on the nanopapers significantly increased the mechanical strength and water repellency. The reinforcement of 1, 3, and 5 wt% CNF to HPC and PVA resins also improved the mechanical properties of the both composites.

  • https://doi.org/10.5658/WOOD.2011.39.3.197 인용 PDF KSCI