• 제목/요약/키워드: Monomers

검색결과 726건 처리시간 0.026초

UV-curable Acrylate/Alkyd Resin 혼합계의 경화특성 II (Curing Properties of UV-ccurable Acrylate/Alkyd Resin Blends II)

  • 남수용;이경옥;대평태문;구철회
    • 한국인쇄학회지
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    • 제18권1호
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    • pp.157-166
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    • 2000
  • UV-curable resins have adventages of quick set, space saving, clean environment, and efficient use of energy. The polymerization induced phase separation has been studied to solve the problem in UV-curing of thick films and develop the new functional materials. On the exposure to UV irradiation, the dynamic elasticity properties were mesured for mixtures of alkyd resin and UV-cruable monomers which have different molecular structures and molecular weights. The curing rate increases with increasing temperature and UV intensity. In addition, The gel point is strongly influenced by temperature and UV intensity

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Molecular Dynamics Simulations of the OSS2 Model for Water and Oxonium Ion Monomers, and Protonated Water Clusters

  • Lee, Song-Hi
    • Bulletin of the Korean Chemical Society
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    • 제23권1호
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    • pp.107-111
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    • 2002
  • The OSS2 (Oj?me-Shavitt-Singer 2)[L. Oj?me et al., J. Chem. Phys. 109, 5547 (1998)] model for the solvated proton in water is examined for $H_2O,\;H_3O^+,\;H_5O_2^+,\;H_7O_3^+,\;and\;H_9O_4^-$ by molecular dynamics (MD) simulations. The equilibrium molecular geometries and energies obtained from MD simulations at 5.0 and 298.15 K agree very well with the optimized calculations.

아크릴산과 메타크릴산의 효소적 배당화 (Enzymatic Glycosylation of Acrylic Acid and Methacrylic Acid)

  • 박돈희;김해성
    • KSBB Journal
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    • 제16권1호
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    • pp.82-86
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    • 2001
  • Glyco-acrylate and methacrylate were synthesized by lipase-catalyzed glycosylation of acrylic acid, methacrylic acid and their vinyl esters with $\beta$-methyl fructoside and glycerol in t-butanol as a reaction medium. At the optimum conditions for enzymatic glycosylation of acrylic acid and vinyl methacrylate, we attained up to 80% conversion for glyco-acrylate from acrylic acid and 90% conversion for glyco-methacrylate from vinyl methacrylate. The polymerizable glyco-acrylates and methacrylate have biomedical application as hydrophilic monomers and hydration modifiers to be use for hydrogel contact lens formulation.

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THE RANDI$\acute{C}$ INDEX OF SOME DENDRIMER NANOSTARS

  • Madanshekaf, Ali
    • Journal of applied mathematics & informatics
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    • 제29권5_6호
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    • pp.1075-1080
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    • 2011
  • Among the numerous topological indices considered in chemical graph theory, only a few have been found noteworthy in practical application, Randi$\acute{c}$ index is one of them. The dendrimer nanostars is a synthesized molecule built up from branched unit called monomers. In this article, we compute the Randi$\acute{c}$ index of two types of polymer dendrimers and a fullerene dendrimer.

In vitro approach to investigating the free radical generation of endocrine disruptor

  • Kim HJ;Kim BH;An KH
    • 한국환경독성학회:학술대회논문집
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    • 한국환경독성학회 2001년도 춘계심포지움 및 학술발표회
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    • pp.117-117
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    • 2001
  • We investigated Free radical generation of endocrine disrupter, bisphenol A and alkyl esters of phthalic acid (DEP, DBP) using lipid peroxidation, enzyme assay (SOD, Catalase, Gpx-px), Cell viability and phototoxicity. Bisphenol A are monomers of various plastics including polycarbonates and epoxy resins which are used in numerous consumer products. The release of BPA from some of these materials has recently been reported. (omitted)

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Covalent Functionalization of Carbon Nanotubes using Atom Transfer Radical Polymerization

  • Paik, Hyun-Jong
    • 한국고분자학회:학술대회논문집
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    • 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
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    • pp.196-197
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    • 2006
  • Among various polymerization methods to graft polymers on the surface of CNTs, Atom Transfer Radical Polymerization (ATRP) has several advantages, such as a wide range of polymerizable monomers and superb control in molecular structure and weights. Several research groups including us have showed that ATRP is an efficient and versatile method to modify the surface of CNTs. Here, two independent approaches for the covalent attachment of polymers based on ATRP graft-from and graft-onto methods will be discussed.

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DESIGN OF ION CONDUCTIVE POLYMERS BASED ON IONIC LIQUIDS

  • Ohno, Hiroyuki
    • 한국고분자학회:학술대회논문집
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    • 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
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    • pp.123-124
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    • 2006
  • Ionic liquids (ILs) are collecting keen interests as an advanced substituent of electrolyte solution as well as novel solvents. In the present talk, I will introduce some strategies to fix IL structure on polymer chains to prepare polar polymers with low glass transition temperature. Namely, cationic, anionic, and zwitterionic monomers have been prepared, and they have been homopolymerized or copolymerized to prepare polymer electrolytes with different properties. The polymers themselves showed very poor ionic conductivity, but it was improved by suitable spacer between charged site and main chain. Other unique characteristics of functional ILs and new polymerized ionic liquids will also be mentioned.

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