• Title/Summary/Keyword: Vinyl chloride monomer

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Reactions of Metal Catalysts with Polar Vinyl Monomers

  • Jordan Richard F.
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.153-154
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    • 2006
  • The development of metal catalysts that can polymerize or copolymerize "polar" $Ch_2=CHX$ monomers by insertion mechanisms would significantly expand the scope of metal-catalyzed polymerization and enable the synthesis of new materials with enhanced properties. We have studied the reactions of single-site olefin polymerization catalysts with vinyl chloride, acrylonitrile, and vinyl ethers, in order to probe monomer coordination trends, insertion rates and regioselectivity, and the structures and reactivity of metal alkyls that contain functional groups on the alpha and beta positions of the alkyl chain. These studies provide insights to the key issues that underlie the "polar monomer" problem. Copolymerization of olefins and selected vinyl ethers has been achieved.

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Template polymerization of multi-vinyl monomer with poly(2-hydroxyethyl methacrylate) backbone

  • Saito, Reiko;Yoko, Kazutaka;Iijima, Yuki
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.323-323
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    • 2006
  • Multi-vinyl monomer, which contains many vinyl groups in a molecule, was prepared by esterification of hydroxyl groups of poly(2-hydroxyethyl methacrylate) with methacryloyl chloride. Then, copper-mediated atom transfer radical polymerization was carried out as a template polymerization. The propagation of polymerization was investigated by kinetic analysis.

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Photo-induced Living Cationic Polymerization of Isobutyl Vinyl Ether in the Presence of Various Combinations of Halides of Diphenyliodonium and Zinc Salts in Methylene Chloride

  • Kwon Soonhon;Chun Hyunjeong;Mah Soukil
    • Fibers and Polymers
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    • v.5 no.4
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    • pp.253-258
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    • 2004
  • Living nature of photoinduced cationic polymerization of isobutyl vinyl ether (IBVE) in the presence of various combinations of diphenyliodonium halide (DPIX), a photocationic initiator and zinc halide $(ZnX_2)$ in methylene chloride has been investigated. Attainment of $100\%$ conversion and a linear relationship between $\%$conversion and number average molar mass of the resulting polymer, strongly suggests the living nature of this system. Livingness of the polymerization system was observed irrespective to the type of halide anion of the initiator and zinc salts unless the reaction temperature is not higher than $-30^{\circ}C$. The rate of polymerization decreases in the order of iodide > bromide > chloride when halide salt of DPIX and $ZnX_2$ are used. It is postulated that the cationic initiation is started by the insertion of weakly basic monomer in to the activated C-X terminal of the monomer adduct which is a reaction product of monomer and HX, a photolytic product of DPIX, formed in situ during the photo-irradiation process. It was concluded that polymerization is initiated by the insertion of weakly basic monomer into activated C- X terminal of monomer adduct due to the pulling action of$ZnX_2$, which successively producing a new polarized C-X terminal for the propagation in cationic nature. This led us to a conclusion that the living nature of this cationic polymerization is ascribable to the polarized C-X growing terminal, which is stable enough to depress the processes of chain transfer or termination process.

Development of the testing method for vinyl chloride monomer (VCM) in polyvinyl chloride(PVC) samples (PVC 제품에서의 염화비닐 단량체 정량분석 방법에 관한 연구)

  • Kweon, Deok-Jun;Choi, Ki-In;Eom, Hui-Jeong;Lee, Jae-In;Choi, Zel-Ho
    • Analytical Science and Technology
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    • v.25 no.6
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    • pp.395-401
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    • 2012
  • This study presents a method for the quantitative analysis of residual vinyl chloride monomer (VCM) in PVC products. In elution solvent, the extraction efficiency was similar by ethanol, THF, and acetone, but using n-hexane, it indicated relatively low extraction efficiency. Measuring VCM in the pulverized PVC samples, it showed reasonable results in both the direct injection method and headspace method with GC/MS. Regarding analysis of VCM in the intermediate sponge samples, five laboratories showed good results, and from the results, it was considered that VCM quantitative method in this study was reliable.

Synthesis of Novel Silicone Containing Vinylic Monomer and Its Uses in the Waterborne Polyurethane-Veova/Vinyl Acetate Hybrid Emulsion Copolymers (비닐단량체를 함유한 새로운 실리콘의 합성과 수성 Polyurethane-Veova/Vinyl Acetate 하이브리드 에멀젼 공중합체 내에서 사용)

  • Naghash, Hamid Javaherian;Naeni, Elham Kasaeian
    • Polymer(Korea)
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    • v.35 no.5
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    • pp.409-418
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    • 2011
  • A novel silicone (Si) containing vinylic monomer, N-(3-(triethoxysilyl)propyl) methacrylamide (TESPMA), based on 3-aminopropyltriethoxysilane (APTES) and methacryloyl chloride (MCl) has been synthesized for formulation of waterborne polyurethane (WPU). Two types of vinyl group containing Si, methacryloxypropyltriethoxysilane (MPTES) and triethoxyvinylsilane (TEVS), have been used as coupling reagents for comparison of the effects of Si kinds with TESPMA on the WPU. A series of new siliconized WPU, vinyl acetate/vinyl ester of versatic acid (VAc-Veova), TESPMA, MPTES and TEVS hybrid latexes have been successfully prepared by emulsion polymerization in the presence of WPU dispersion.

Numerical Simulations of the Pyrolysis of 1,2 Dichloroethane (1,2 Dichloroethane의 열분해에 대한 수치해석)

  • Lee, Ki-Yong
    • Proceedings of the KSME Conference
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    • 2001.06d
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    • pp.697-702
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    • 2001
  • Numerical simulations of 1,2 dichloroethane(EDC) pyrolysis are conducted to understand the process on the production of the vinyl chloride monomer(VCM) and by-products. A chemical kinetic mechanism is developed, the adopted scheme involving 44 gas-phase species and 260 elementary forward and backward reactions. Detailed sensitivity analyses and the rates of production analysis are performed on each of the reactions and the various species, respectively. The concentrations of EDC, VCM, and HCI predicted by this mechanism are in good agreement with those deduced from experiments of commercial and laboratory scale. The mechanism is found to accurately predict the VCM yield and the production of by-products by varying the ranges of pyrolysis temperature, residence time, and pressure which impact on the pyrolysis of 1,2 dichloroethane. The influence of reactions related to H atom on the relative sensitivity of EDC becomes important as the residence time increases. The pyrolysis of EDC mainly occurs through $C_{2}H_{4}Cl_{2}+Cl=CH_{2}ClCHCl$.

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Numerical Simulations of the Pyrolysis of 1, 2 Dichloroethane

  • Lee, Ki-Yong
    • Journal of Mechanical Science and Technology
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    • v.16 no.1
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    • pp.102-108
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    • 2002
  • Numerical simulations of 1, 2 dichloroethane(EDC) pyrolyisis are conducted to understand the process in the production of the vinyl chloride monomer (VCM) and by-products. A chemical kinetic mechanism Is developed, with the adopted scheme involving 44 gas-phase species and 260 elementary forward and backward reactions. Detailed sensitivity analyses and the rates of production analysis are performed on each of the reactions and the various species, respectively. The concentrations of EDC, VCM, and HCI predicted by this mechanism are in good agreement with those deduced from experiments of commercial and laboratory scale. The mechanism is found to accurately predict the EDC yield an(1 the production of by-products by varying the ranges of pyrolysis temperature, residence time, and pressure which impact on the pyrolysis of 1, 2 dichloroethane. The influence of reactions related to H atom on the relative sensitivity of EDC becomes important as the residence time increases. The pyrolysis of EDC mainly occurs through C$_2$H$_4$Cl$_2$+Cl=CH$_2$CICHI+HCI.

The level of urinary malondialdehyde concentrations in vinyl chloride monomer exposure workers (염화비닐 노출 근로자의 요중 Malondialdehyde 농도 수준)

  • Kim, Hyun Soo;Kim, Chi-Nyon;Won, Jong Uk;Park, Jun Ho;Kim, Gwang Suk;Ahn, Mi Hyun;Roh, Jaehoon
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.17 no.2
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    • pp.81-88
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    • 2007
  • The aim of this study was to investigate whether the exposure to vinyl chloride monomer(VCM) induces lipid peroxidation in workers by evaluating the concentration of malondialdehyde(MDA) in the urine in order to assess worker's oxidative stress due to exposure of vinyl chloride monomer. The subjects investigated in the study were divided into the experimental group; 18 workers exposed to VCM, and the control group; 19 workers unexposed to VCM. A gas chromatography/pulsed flame photometric detector(GC/PFPD) was utilized to analyze thiodiglycolic acid(TDGA), which was methylated with trimethylsilyldiazomethane (2.0M in diethyl ether) in urine and the urinary MDA, the product of lipid peroxidation, was determined by high-performance liquid chromatography/ultraviolet-visible detector after derivatized with 2,4-dinitrophenylhydrazine(DNPH). The concentrations of urinary TDGA in controls and VCM exposure workers were 0.13(2.01)mg/g Cr. GM(GSD) and 0.35(1.96)mg/gCr. GM(GSD), respectively. The concentrations of urinary MDA were $0.12(2.21){\mu}mol/gCr$. GM(GSD) in controls and $1.35(1.79){\mu}mol/gCr$. GM(GSD) in VCM exposure workers. As a result of simple regressions analysis between urinary concentration of TDGA and MDA in VCM exposure workers, it was found that the $R^2$ value was 0.261 (p=0.03) and the drinking and smoking did not affect their level. In conclusion, the workers exposed to VCM have a potentially to suffered by oxidative stress due to VCM exposure and the urinary MDA can be applicable to the marker of effect to assess the level of worker's VCM exposure.

Preparation of Anion Exchange Membranes of Cross-linked Poly((vinylbenzyl)trimethylammonium chloride-2-hydroxyethyl methacrylate)/Poly(vinyl alcohol) (가교결합한 Poly((vinylbenzyl)trimethylammonium chloride-2-hydroxyethyl methacrylate)/poly(vinyl alcohol) 음이온 교환막 제조)

  • Kim, Mi-Yang;Kim, Kwang-Je;Kang, Ho
    • Applied Chemistry for Engineering
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    • v.21 no.6
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    • pp.621-626
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    • 2010
  • Anion exchange membranes can be used for reverse electrodialysis for electric energy generation, and capacitive deionization for water purification, as well as electrodialysis for desalination. In this study, anion exchange membranes of poly((vinylbenzyl) trimethylammonium chloride-2-hydroxyethyl methacrylate)/poly(vinyl alcohol) were prepared through the polymerization of (vinylbenzyl)trimethylammonium chloride and 2-hydroxyethyl methacrylate in aqueous poly(vinyl alcohol) solutions, esterification with glutaric acid, and cross-linking reaction with glutaraldehyde. We investigated electrochemical properties for the anion exchange membranes prepared according to experimental conditions. Ion exchange capacity and electrical resistance for the membranes were changed with a variation in the monomer ratio in polymerization. Water uptake and conductivity for the membranes decreased with an increase in the content of glutaric acid in esterification. The change in the time of crosslinking reaction with the formed film and glutaraldehyde affected electrochemical properties such as water uptake, conductivity, or transport number for the membranes. Chronopotentiometry and limiting current density for the anion exchange membranes prepared were measured.

Functional Monomers and Polymers (Ⅰ). Polymerization of Acryloyl-Type Monomer Containing Lactam Ring (관능성 단량체 및 중합체 (제1보). Lactam 고리를 함유하고 있는 Acryloyl 형 단량체의 중합)

  • S. K. Noh;G. S. Sur;Sam K. Choi
    • Journal of the Korean Chemical Society
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    • v.24 no.1
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    • pp.64-72
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    • 1980
  • The synthesis of N-acrylylpyrrolidone has been carried out by the reaction of pyrrolidone and acrylyl chloride. The study on the copolymer of N-acrylylpyrrolidone and styrene is attempted.The copolymerization of N-acrylylpyrrolidone and styrene is carried out in benzene.Monomer reactivity ratio of N-acrylylpyrrolidone and styrene was calculated by Fineman and Ross equation. It is observed that the copolymer of N-acrylylpyrrolidone and styrene has random distributed acyl-lactam function on the vinyl polymer backbone.

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