• 제목/요약/키워드: Cellulose acetate

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Properties of Cellulose Acetate and Polyethylene Composite Film

  • Hwang, Kweon-Hwan;Lee, Won-Hee;Lim, Bu-Kug
    • 한국가구학회지
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    • 제18권4호
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    • pp.268-274
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    • 2007
  • Environmentally-friendly polymer composite films were manufactured from cellulose acetate (CA) and polyethylene (PE). To investigate the optimum manufacturing conditions for the composite, various tests such as thermal analysis, surface observation, IR spectra analysis, and elongation ratio of polymer composite films were carried out. The mixing ratio of each element and manufacture condition was found to be very important for the best goods.

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비타민 E 아세테이트가 봉입된 셀룰로오스 나노입자의 제조 (Preparation of Cellulose Nanoparticles Loaded with Vitamin E Acetate)

  • 남다은;정택규;김승수;신채호;신병철
    • 폴리머
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    • 제28권2호
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    • pp.128-134
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    • 2004
  • 비타민E 아세테이트를 봉입하고 있는 셀룰로오스 나노입자는 개선된 자발적 유화확산 방법을 이용하여 제조하였다. 셀룰로오스 나노입지는 셀룰로오스 유도체와 비타민E 아세테이트를 아세톤/에탄올 혼합유기 용매로 용해한 다음 초음파 발생장치를 이용하여 폴리(옥시에틸렌 솔비탄 모노올레이트) 용액에 분산하여 제조하였다. 입자크기와 비타민 E 아세테이트의 봉입률은 광산란 장치와 UV 분광계를 이용하여 각각 측정하였다. 나노입자의 안정성은 상온에서 30일간 입자크기 변화를 통해 비교하였고 입자의 형태는 주사전자 현미경을 통해 관찰하였다. 결과적으로 제조된 나노입자의 형태는 구형인 것을 관찰하였고, 상온에서 30일간 입자크기 변화가 없었다. 가장 좋은 셀룰로오스 나노입자의 제조 조건은 1% w/v 니트로셀룰로오스와 8% w/v 폴리(옥시에틸렌 솔비탄 모노올레이트)를 사용하였을 경우이고, 이때 나노입자의 크기는 65nm, 비타민E 아세테이트의 봉입률은 71%의 값을 나타내었다.

고품위 안경테 제작을 위한 안경테 소재(Cellulose Acetate)의 가공성 평가 및 절삭조건 선정 (Machinability Evaluation and Cutting Condition Selection of Cellulose Acetate for Manufacturing of High-quality Spectacle Frames)

  • 강익수;이승용;최현진;이태호;최성대
    • 한국기계가공학회지
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    • 제11권4호
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    • pp.20-24
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    • 2012
  • The objective of this study is to investigate proper cutting conditions of cellulose acetate(CA) for eyewear frames. Various cutting experiments with variation of spindle speeds and feed rates are conducted to evaluate the machinability of CA. The machinability of CA materials were discussed in terms of the cutting forces, surface roughnesses and chip formations. The cutting conditions of high spindle speeds and the feed per tooth of less than 0.05mm are recommended considering the surface roughnesses and chip formations. Also, the correlation between the surface roughness and the chip formation is investigated. These results are able to be applied to design the high-speed machine tool of CA frame.

전도성 Cellulose Acetate/Polypyrrole 복합체의 제조와 전기적 성질 (Preparation and Electrical Properties of Conducting Cellulose Acetate/Polypyrrole Composites)

  • Park, Yun-Heum;Bang, Ho-Joo
    • 한국염색가공학회지
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    • 제2권1호
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    • pp.31-36
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    • 1990
  • 산화제를 함유한 셀룰로우스 아세테이트 필름을 피롤 증기 속에 노출시킴으로써 전도성 셀룰로우스/폴리피롤 복합체 필름을 합성하고 폴리피롤의 형성을 IR 및 전자현미경을 사용하여 확인했다. 복합체 내에 존재하는 폴리피롤의 형태는 사용한 산화제의 종류에 따라 다르게 나타났다. 산화제로 사용한 몇 가지 금속염화물 중에서 염화제 2철이 높은 전도도를 가지는 복합체를 합성하는데 가장 효과적이며 50중량 퍼센트의 염화제 2철을 첨가해서 제조한 복합체 필름의 전기전도도는 $10^{-2}S/cm$에 달한다.

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셀룰로오스 나노크리스탈 강화 셀룰로오스 아세테이트 나노복합소재 제조 및 특성 (Preparation and Characteristics of Cellulose Acetate Based Nanocomposites Reinforced with Cellulose Nanocrystals (CNCs))

  • Gwon, Jae-Gyoung;Lee, Dan-Bee;Cho, Hye-Jung;Lee, Sun-Young
    • Journal of the Korean Wood Science and Technology
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    • 제46권5호
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    • pp.565-576
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    • 2018
  • 셀룰로오스 아세테이트(cellulose acetate, CA)는 높은 투명도와 열 저항성을 갖고 있어 복합소재 개발에 많이 응용되고 있다. 본 연구에서는 CA 복합재의 기계적 강도 개선을 위해 셀룰로오스 나노크리스탈 (cellulose nanocrystals, CNCs)을 강화제로 첨가하였다. CA 수지 내부에 CNCs의 고른 분산을 위해 선 분산(predispersion)법 적용 후, 압출 및 사출하는 제조 방식으로 CA 복합재를 제조하였다. 기계적 특성 분석 결과, CNCs를 3 wt% 첨가하였을 때 강화효과(reinforcing effect)로 인해 최대 인장강도와 굴곡강도 값을 보임을 확인하였다. 열중량 분석법을 이용한 열분해 거동 분석을 통해 황산 처리된 CNCs의 첨가는 CA 복합소재의 열안정성을 약간 감소시키는 결과를 얻었다.

Preparation of Regenerated Cellulose Fiber via Carbonation. I. Carbonation and Dissolution in an Aqueous NaOH Solution

  • Oh, Sang Youn;Yoo, Dong Il;Shin, Younsook;Lee, Wha Seop;Jo, Seong Mu
    • Fibers and Polymers
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    • 제3권1호
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    • pp.1-7
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    • 2002
  • Cellulose carbonate was prepared by the reaction of cellulose pulp and $CO_2$ with treatment reagents, such as aqueous $Zncl_2$ (20-40 wt%) solution, acetone or ethyl acetate, at -5-$0^{\circ}C$ and 30-40 bar ($CO_2$) for 2 hr. Among the treatment reagents, ethyl acetate was the most effective. Cellulose carbonate was dissolved in 10% sodium hydroxide solution containing zinc oxide up to 3 wt% at -5-$0^{\circ}C$. Intrinsic viscosities of raw cellulose and cellulose carbonate were measured with an Ubbelohde viscometer using 0.5 M cupriethylenediamine hydroxide (cuen) as a solvent at $20^{\circ}C$ according to ASTM D1795 method. The molecular weight of cellulose was rarely changed by carbonation. Solubility of cellulose carbonate was tested by optical microscopic observation, UV absorbance and viscosity measurement. Phase diagram of cellulose carbonate was obtained by combining the results of solubility evaluation. Maximum concentration of cellulose carbonate for soluble zone was increased with increasing zinc oxide content. Cellulose carbonate solution in good soluble zone was transparent and showed the lowest absorbance and the highest viscosity. The cellulose carbonate and its solution were stable in refrigerator (-$5^{\circ}C$ and atmospheric pressure).

셀룰로오스를 이용한 마이크로 몰드 및 나노섬유 제작 (Fabrication of the micro-mold and nanofiber using cellulose solution)

  • 조기연;임현규;강광선;김재환
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2007년도 추계학술대회논문집
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    • pp.69-72
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    • 2007
  • Cellulose is a beneficial material that has low cost, lightweight, high compatibility and biodegradability. Recently electroactive paper (EAPap) on cellulose base was discovered as a smart material and actuator through ion migration and piezoelectric effect. Furthermore cellulose has a potentiality to apply the display material, because of its high reflectivity, flexibility and high transmittance. The various shapes and height patterns of the Cellulose acetate (CA) solution, such as circle and honeycomb patterns, were fabricated and observed by field emission scanning electron microscope (FESEM, S4300 Hitachi). The resulting pattern showed uniform size in the large area without defect. After stretching the CA film with saponification process in the sodium methoxide in methanol solution, Most of the compositions become one directional ordered nanofibers below 50nm.

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