• Title, Summary, Keyword: methyl methacrylate

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Polymerization of Methyl Methacrylate with Nickel $\alpha$-Diimine Catalysts: Effect of the Methyl Position in the Ligand

  • Kim, Il;Kim, Jae-Sung;Han, Byeong-Heui;Ha, Chang-Sik
    • Macromolecular Research
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    • v.11 no.6
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    • pp.514-517
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    • 2003
  • In the solution polymerizations of methyl methacrylate with (${\alpha}$-diimine)nickel(II)/methylaluminoxane (MAO), we observed effects of the position of two methyl substituents in the ligand on both the activities of the catalysts and the polymer microstructure. ${\alpha}$-Diimine nickel(II) catalysts gave syndiotactic-rich poly(methyl methacrylate) with high molecular weight and narrow molecular weight distribution.

Effect of Poly(butyl acrylate)-Poly(methyl methacrylate) Rubber Particle Texture on the Toughening Behavior of Poly(methyl methacrylate)

  • Chung, Jae-Sik;Park, Kyung-Ran;Wu, Jong-Pyo;Han, Chang-Sun;Lee, Chan-Hong
    • Macromolecular Research
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    • v.9 no.2
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    • pp.122-128
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    • 2001
  • Monodisperse composite latex particles with size of ca. 300 nm, which consist ofn-butyl acrylate as a soft phase and methyl methacrylate as a hard phase with different morphology, were synthesized by seeded multi-stage emulsion polymerization. Three types of composite latex particles including random-, core/shell-, and gradient-type particles were obtained by using different monomer feeding methods during semi-batch emulsion polymerization. Effect of poly(butyl acrylate)-poly(methyl methacrylate) rubber particle morphology on the mechanical and rheological properties of rubber toughened poly(methyl methacrylate) was investigated. Among three different rubber particles, the gradient-type rubber particle showed better toughening effect than others. No significant variation of rheological property of poly(methyl methacrylate)/rubber blends was observed for the different rubber particle morphology.

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Synthesis and Characterization of Poly(Urethane-Methyl methacrylate) Hybrid Emulsion as a Plastic Coating Resin (플라스틱 코팅용 Poly(Urethane-MMA) 혼성 에멀젼 합성 및 특성 연구)

  • Yeom, Ji-Yoon;Baek, Kyung-Hyun;Lee, Jun-Young;Yi, Gyoung-Bae;Yoo, Byung-Won;Kim, Jung-Hyun
    • Journal of Adhesion and Interface
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    • v.8 no.1
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    • pp.8-14
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    • 2007
  • Poly(urethane-methyl methacrylate) hybrid emulsions can be controlled with their thermal, mechanical and anti-chemical properties as plastic coating materials. In this study, water dispersed poly(urethane-methyl methacrylate) hybrid emulsions were prepared by prepolymer synthesis and soap free emulsion polymerization. For imparting hydrophilicity on polyurethane prepolymer, 2,2-bis (hydroxymethyl) propionic acid was added to the polyurethane prepolymer with methyl methacrylate monomer and was neutralizated by triethylamine (TEA). After neutralization, the prepolymer mixture was dispersed in the water phase with stable droplets. The synthesis was carried out with chain extension from the ethylene diamine and initiation of methyl methacrylate by soap free emulsion polymerization. Stable poly(urethane-methyl methacrylate) hybrid emulsion was successfully obtained with different synthetic conditions and acrylic monomer contents. Poly(urethane-methyl methacrylate) hybrid emulsion were characterized and compared with tensile strength, viscosity, and adhesion properties.

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Enzymatic Synthesis of Methyl Fructoside Acrylate and Methacrylate (메틸프룩토시드 아크릴레이트와 메타크릴레이트의 효소적 합성)

  • Sung, Duk-Yong;Kim, Hae-Sung
    • Journal of Korean Ophthalmic Optics Society
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    • v.5 no.1
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    • pp.89-94
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    • 2000
  • Methyl fructoside acrylate and methacrylate were synthesized by lipase-catalyzed glycosylation of acrylic acid, methacrylic acid and vinyl methacrylate with ${\beta}$-methyl fructoside in t-butanol as a reaction medium. From the optimum conditions of enzymatic synthesis for acrylate and methacrylate, we obtained 78% conversion for methyl fructoside acrylate and 93% conversion for methyl fructoside methacrylate. The polymerizable sugar acrylates have potential application as biomedical polymer such as hodrogel contact lens.

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Synthesis of block copolymer of polystyrene and polyethylene glycol methyl ether methacrylate(PEGMA) by ATRP (atom transfer radical polymerization) (ATRP(atom transfer radical polymerization)에 의한 polystyrene과 poly ethylene glycol methyl ether methacrylate(PEGMA)의 블록 공중합체의 합성)

  • Kim, Sang-Hern
    • Journal of the Korean Applied Science and Technology
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    • v.26 no.3
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    • pp.306-316
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    • 2009
  • In this study, block copolymer of polystyrene and polyethylene glycol methyl ether methacrylate(PEGMA) by ATRP(atom transfer radical polymerization) method was synthesized. 4 arm-molecule which contained halogen atom was synthesized for an initiator. With 4 arm-molecule monodispered polystyrene were synthesized by ATRP method. The molecular change of synthesized monodispersed polystyrene with respect to time was investigated and living polymer characteristic was confirmed. Block copolymer of polystyrene and polyethylene glycol methyl ether methacrylate(PEGMA) was synthesized by ATRP with macroinitiator which was synthesized from the monodispersed polystyrene(Mn=12000). The molecular weight of obtained PS-b-PEGMA was 22,000.

Effect of Addition Amounts of Hydroxyethyl Methacrylate and Methyl Methacrylate on the Properties of Waterborne Polyurethane-Acrylic Hybrid Solutions (Hydroxyethyl Methacrylate와 Methyl Methacrylate의 첨가량 변화가 수분산 폴리우레탄-아크릴 혼성 용액의 물성에 미치는 영향)

  • Kim, Byung Suk;Yoo, Byung Won;Lee, Myung Goo;Byun, Tae Gang;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.50 no.4
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    • pp.632-638
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    • 2012
  • Waterborne polyurethane dispersions (PUD) were synthesized from isophorone diisocyanate (IPDI), polycarbonate diol (PCD) and dimethylol propionic acid (DMPA) as starting materials. Subsequently, waterborne polyurethane-acrylic hybrid solutions were prepared by reacting the PUD with different amounts of the mixture of acrylate monomers, HEMA (2-hydroxyethyl methacrylate) and MMA (methyl methacrylate). As a result, the average particle size of waterborne polyurethane-acrylic hybrid solutions was increased with increasing the addition amounts of acrylate monomers. Also, the prepared coating films from waterborne polyurethane-acrylic hybrid solutions showed better abrasion resistance and chemical resistance than those of pure PUD.

The Preparation and Electrochemical Properties of Pore-filled and Polystyrene-based Anion-exchange Membranes Using Poly(ethylene glycol)methyl Ether Methacrylate (Poly(ethylene glycol)methyl Ether Methacrylate를 이용한 세공충전 폴리스티렌계 음이온 교환막의 제조 및 전기화학적 특성)

  • Mun, Hye Jin;Choi, Jae Hak;Hong, Young Taik;Chang, Bong Jun
    • Membrane Journal
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    • v.25 no.6
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    • pp.515-523
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    • 2015
  • While commercial polystyrene-based ion exchange membranes have simple manufacturing processes, they also possess poor durability due to their brittleness. Poly(ethylene glycol)methyl ether methacrylate with hydrophilic side chains of poly(ethylene glycol) was used as a co-monomer to make the membranes have improved flexibility. Hydrophilicity/hydrophobicity of the anion exchange membranes were able to be adjusted by varying the chain lengths of the poly(ethylene glycol). For the preparation of the anion exchange membranes, a porous PE substrate was immersed into monomer solutions and thermally polymerized. The prepared membranes were subsequently reacted with trimethylamine to produce anion exchange functional groups, Quaternary ammonium salts. The prepared pore-filled anion exchange membranes were evaluated in terms of ion exchange capacity, electric resistance, elongation at break and water uptake.

Dispersion Polymerization of Acrylate Monomers in Supercritical $CO_2$ using GMA-functionalized Reactive Surfactant (초임계 이산화탄소에서 Glycidyl methacrylate 반응성 계면활성제를 이용한 아크릴레이트의 분산중합)

  • Park, Kyung-Kyu;Kang, Chang-Min;Lee, Sang-Ho
    • Elastomers and Composites
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    • v.45 no.4
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    • pp.256-262
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    • 2010
  • Dispersion polymerization of methyl acrylate, ethyl acrylate, butyl acrylate, and glycidyl methacrylate were performed in supercritical $CO_2$ at $80\;^{\circ}C$ and 346 bar. Glycidyl methacrylate linked poly(dimethylsiloxane) (GMS-PDMS) surfactant, which was prepared by linking glycidyl methacrylate to monoglycidyl ether terminated PDMS with amino-propyltriethoxysilane, was used as surfactant for the dispersion polymerization in $CO_2$. The yield of the poly(alkyl acrylate) polymers, synthesized in $CO_2$ medium, decreased as the alkyl tail of the acrylate monomers increased. Poly(glycidyl methacrylate) and poly(methyl acrylate) were produced in bead form whereas poly(ethyl acrylate) and poly(butyl acrylate) were viscous liquid. The poly(glycidyl methacrylate) particles had a number average diameter of 2.45 ${\mu}m$ and monodisperse distribution. The poly(methyl acrylate) had a number average diameter of 0.52 ${\mu}m$ and the particle size distribution was bimodal. The glass transition temperatures ($T_g$) of the poly(glycidyl methacrylate) and the poly(alkyl acrylate) products were 4~9 K higher than the $T_g$ of the corresponding acrylate polymers synthesized in conventional processes.

Controlled Release of Econazole Nitrate from Skin Adhesive Methyl Methacrylate-Butyl Methacrylate Copolymer-Povidone Films (피부 부착성 메칠메타크릴레이트-부틸메타크릴레이트 공중합체-포비돈 필름으로부터의 질산에코나졸의 제어 방출)

  • Chun, In-Koo;Lee, Ji-Eun
    • Journal of Pharmaceutical Investigation
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    • v.19 no.3
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    • pp.145-154
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    • 1989
  • Methyl methacrylate-butyl methacrylate copolymer (MMBM)-povidone (PVP) films were investigated as a potential topical drug delivery system for the controlled release of econazole nitrate as a model drug. The effect of changes in film composition, drug concentration, film thickness, pH and temperature of release medium on the in vitro release of econazole nitrate were studied. The release rate constant was found to be increased with increasing povidone content in dry films. Drug release followed zero-order kinetics in the initial stage and then release rate increased gradually with time, espicially in the films having larger proportions of PVP. The release rate was found to be dependent on drug content, film thickness, the pH and temperature of release medium. Antimicrobial test showed that microbial growth was inhibited markedly with increasing proportions of PVP in films. Also drug content and film thickness affected the antimicrobial activity.

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