• 제목/요약/키워드: Poly vinyl pyrrolidone (PVP)

검색결과 43건 처리시간 0.034초

견단백질 / Poly (Vinyl pyrrolidone)의 열특성 (Differential Scanning Calorimetric and Thermogravimetric Analysis of Silk Fibroin / poly (Vinyl pyrrolidone))

  • 권해용;이광길;여주홍;우순옥;한상미
    • 한국잠사곤충학회지
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    • 제49권2호
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    • pp.77-80
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    • 2007
  • 실크단백질을 이용한 나노화 소재개발을 위한 기초연구의 일환으로 실크 피브로인과 PVP를 반응시켜 제조한 견단백질/PVP의 열 특성을 살펴보기 위하여 시차열분석 및 열중량분석을 행하였다. 1. PVP의 유리전이온도는 $175^{\circ}C$ 부근에서 관찰되었으며 실크 단백질과 반응에 의하여 영향을 받지 않았으나 견단백질/PVP는 $220^{\circ}C$ 부근에서 미지의 발열피크를 나타내었다. 2. 열중량 분석 결과 PVP의 함량이 증가함에 따라 실크 단백질에 기인한 열분해시작온도가 상대적으로 증가하는 것으로 관찰되었다.

폴리프로필렌 표면 위에 폴리비닐피롤리돈의 플라즈마 유도 그래프트 공중합 (Plasma-Induced Grafting of Poly(N-vinyl-2-pyrrolidone) onto Polypropylene Surface)

  • 지한솔;정시인;허호;최호석;김재하;박한오
    • 폴리머
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    • 제36권3호
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    • pp.302-308
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    • 2012
  • 본 연구의 목적은 대기압 플라즈마 처리된 평판형 폴리프로필렌(polypropylene, PP) 필름 표면 위에 폴리비닐피롤리돈(poly($N$-vinyl-2-pyrrolidone), PVP)을 그래프트 공중합시키기 위한 최적 조건을 찾는데 있다. 대기압 플라즈마 처리 조건은 RF power 200W, Ar 유속 6 LPM, 처리시간 30초, 처리 후 노출시간은 5분으로 고정하였다. 그래프트 공중합에서는 중합 시간, 중합 온도, 비닐피롤리돈($N$-vinyl-2-pyrrolidone, NVP) 농도의 조건을 각각 달리하여 표면 그래프트도의 변화를 조사하였다. 그 결과, 중합 시간 6시간, 중합 온도 $90^{\circ}C$, NVP 농도 40%에서 가장 높은 그래프트도를 나타내었다. ATR-FTIR, X-ray photoelectron spectroscopy(XPS), SEM 분석을 통해서도 PVP의 도입을 확인할 수 있었다.

초임계 반용매법을 이용한 폴리비닐피롤리돈 미세입자의 제조 (Preparation of Poly(N-vinyl-2-pyrrolidone) Microparticles Using Supercritical Anti-solvent)

  • 신문삼;김화용
    • 청정기술
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    • 제14권4호
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    • pp.242-247
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    • 2008
  • 화장품, 의약품, 전자소재 분야에서 생체적합, 생분해성 고분자로 널리 사용되는 폴리비닐피롤리돈(PVP)을 에어로젤 용매추출 방법에 의해 미세입자를 제조하였다. 용매로는 이 염화메탄올, 반용매로는 초임계 이산화탄소가 사용되었다. 온도, 압력, 이산화탄소 유량, 용액유량의 작업조건에 따라 0.184 - $0.249\;{\mu}m$입자크기를 얻었고, 그 입자크기에 영향을 미치는 초기구형 입자크기와의 상관관계를 규명하였다.

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고분자와 저분자의 상호작용의 해석 ( I ) -균일수용액계에서의 Poly(vinyl pyrrolidone)과 Methylene Blue의 상호작용- (Interaction Analysis of Small Molecules with Polymers( I ) - Interaction between Poly(vinyl pyrrolidone) and Methylene Blue in Homogeneous Systems-)

  • 박수민;김문식;유정문
    • 한국염색가공학회지
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    • 제5권3호
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    • pp.182-187
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    • 1993
  • The binding isotherms of Methylene Blue with Poly(vinyl pyrrolidone) (PVP) were determined in a Mcllvaine buffer of pH 8.0 at 3$0^{\circ}C$ by a dynamic dialysis methods. The isotherms showed a partition binding which was increase linearly with the increase of free dye concentration in solution. The Scatchard plots for Poly(vinyl pyrrolidone)-Methylene Blue gave a constant value. The results were interpreted by the McGhee and von Hippel theory considering non-cooperative binding. The intrinsic binding constant k, for Poly(vinyl pyrrolidone)-Methylene Blue was 6.02$\ell$/base mol.

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대전방지 PEDOT/PSS 필름 제조를 위한 바인더에 관한 연구 (Study on Binders for Preparing Antistatic Films of PEDOT/PSS)

  • 김석준;박완수;황정석;박나영;최영주;정대원
    • 공업화학
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    • 제26권4호
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    • pp.458-462
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    • 2015
  • 전도성 고분자인 poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) (PEDOT/PSS)의 투명한 필름을 제조하기 위해서는 바인더의 사용이 반드시 필요하다. 본 연구에서는 poly(vinyl alcohol) (PVA), poly(vinyl pyrrolidone) (PVP) 및 PSS를 바인더로서 검토하여 그 특성을 비교하였다. PEDOT/PSS 필름의 형성 여부는 기본적으로 바인더를 포함하는 코팅액의 표면장력 값에 의존하였다. PSS 또는 PVP를 바인더로 사용하였을 때는 필름이 형성되지 않거나 필름이 기재로 부터 쉽게 박리되는 현상이 나타났다. 그러나 PVA를 단독으로 사용하거나 또는 PSS 및 PVP를 PVA와 혼합하여 사용하면 투명하며 균일한 표면저항 값을 나타내는 대전방지 필름을 얻을 수 있었다. 필름의 접착력 및 장기 보관 안정성 등을 종합적으로 판단하면, PEDOT/PSS의 대전방지용 필름을 제조하기 위한 바인더로서는 PVA와 PSS의 혼합물이 최적인 것으로 나타났다.

Effect of High-Temperature Spinning and PVP Additive on the Properties of PVDF Hollow Fiber Membranes for Microfiltration

  • Cha, Bong-Jun;Yang, Jung-Mok
    • Macromolecular Research
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    • 제14권6호
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    • pp.596-602
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    • 2006
  • The effect of high-temperature spinning and poly(vinyl pyrrolidone) (PVP) additive on poly(vinylidene fluoride) (PVDF) hollow fiber membranes was investigated using differential scanning calorimetry, X-ray diffraction measurement, and scanning electron microscopy, together with the corresponding microfiltration performances such as water flux, rejection rate, and elongational strength. Using high-temperature spinning, porous hollow fiber membranes with particulate morphology were prepared through PVDF crystallization. The particulate structure of the membranes was further modified by the addition of miscible PVP with PVDF. Due to these effects, the rejection rate and strength of the fibers were increased at the expense of reduced water flux and mean pore size, which indicates that high-temperature spinning and PVP addition are vary effective to control the morphology of PVDF hollow fiber membranes for microfiltration.

Preparation of Porous TiO2 Thin Films by Poly(vinyl chloride)-graft-poly(N-vinyl pyrrolidone) and Their Applications to Dye-sensitized Solar Cells

  • Yeon, Seung-Hyeon;Patel, Rajkumar;Koh, Jong-Kwan;Ahn, Sung-Hoon;Kim, Jong-Hak
    • 전기화학회지
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    • 제14권2호
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    • pp.83-91
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    • 2011
  • Mesoporous titanium dioxide ($TiO_2$) thin films were prepared using poly(vinyl chloride)-graft-poly(N-vinyl pyrrolidone) (PVC-g-PVP) as a templating agent via sol-gel process. Grafting of PVC chains from PVC backbone was done by atom transfer radical polymerization (ATRP) technique. The successful grafting of PVP to synthesize PVC-g-PVP was checked by fourier-transform infrared spectroscopy (FT-IR) and gel permeation chromatography (GPC). The carbonyl group interaction of PVC-g-PVP graft copolymer with $TiO_2$ was confirmed by FT-IR. The porous morphologies of the $TiO_2$ films genereated after calcination at $450^{\circ}C$ was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The mesoporous $TiO_2$ films with 580 nm in thickness were used as a photoelectrode for solid state dye sensitized solar cell (DSSC) and showed an energy conversion efficiency of 1.05% at 100 $mW/cm^2$.

In Vitro Release of Acetaminophen from Mucoadhesive Microsphere Prepared by Poly(acrylic acid)/poly(vinyl pyrrolidone) Interpolymer Complex

  • Chun, Myung-Kwan;Cho, Chong-Su;Choi, Hoo-Kyun
    • 대한약학회:학술대회논문집
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    • 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2-2
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    • pp.231.1-231.1
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    • 2003
  • Mucoadhesive microsphere was prepared by interpo]ymer complexation of po]y(acrylic acid) (PAA) with po]y(vinyl pyrrolidone) (PVP) using solvent diffusion method. The loading efficiency of acetaminophen into the microsphere was 91.3 ${\pm}$ 6.5%. The release rate of acetaminophen from the PAA/PVP complex microspheres was slower than that from PVP microspheres at pH 2.0 and 6.8. The dissolution of microspheres made of the complex was significantly slower than those made of PVP due to H-bond between PVP and PAA. As a result, the release rate of acetaminophen from the complex microspheres was slower than that from PVP microspheres.

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Suzuki-Miyaura Cross-coupling Reaction Catalyzed by Nickel Nanoparticles Supported on Poly(N-vinyl-2-pyrrolidone)/TiO2-ZrO2 Composite

  • Kalbasi, Roozbeh Javad;Mosaddegh, Neda
    • Bulletin of the Korean Chemical Society
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    • 제32권8호
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    • pp.2584-2592
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    • 2011
  • Nickel nanoparticle-poly(N-vinyl-2-pyrrolidone)/$TiO_2-ZrO_2$ composite (Ni-PVP/$TiO_2-ZrO_2$) was prepared by in situ polymerization method. The physical and chemical properties of Ni-PVP/$TiO_2-ZrO_2$ were investigated by XRD, FT-IR, BET, TGA, SEM and TEM techniques. The catalytic performance of this novel heterogeneous catalyst was determined for the Suzuki-Miyaura cross-coupling reaction between aryl halides and phenylboronic acid in the presence of methanol-water mixture as solvent. The effects of reaction temperature, the amount of catalyst, amount of support, solvent, and amount of metal for the synthesis of Ni-PVP/$TiO_2-ZrO_2$, were investigated as well as recyclability of the heterogeneous composite. The catalyst used for this synthetically useful transformation showed considerable level of reusability besides very good activity.