• Title, Summary, Keyword: poly(vinyl chloride)

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A Case Study on the Release Characteristic and Removal Efficiency of Vinyl Chloride in the Poly Vinyl Chloride Extrusion Process (PVC압출공정의 염화비닐 발생특성과 작업환경개선에 관한 사례연구)

  • Park, Dong Uk
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.3 no.1
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    • pp.91-98
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    • 1993
  • This study was carried out to investigate characteristic of vinyl chloride emissioned from poly vinyl chloride extrusion process and to evaluate the efficiency of local exhaust ventilation system. Before local ventilation facility was constructed in poly vinyl chloride extrusion process, the average worker exposure to vinyl chloride was 3.15 ppm, which exceeded Threshold Limit Value of American Conference of Gorvernmental Industrial Hygienists (ACGIH-TLV), 1 ppm. lt is possible that vinyl chloride residues in the poly vinyl chloride resin was released or degased due to extrusion heat. The larger the width of vinyl tube become, the higher worker exposure to vinyl chloride was. It is estimated that vinyl chloride from vinyl chloride resin increased as amount of poly vinyl chloride resin extruded in the extrusion process increased. Canopy hood was an appropriate type for poly vinyl chloride resin extrusion process. This local exhaust ventilation has fan static pressure of 7.65 inch wg($190mmH_2O$, total volumetric flowlate of 4,796 CFM ($135.8m^3$/min) and fan power requirement of 12 hp (8.952 Kw). After this local exhaust ventilation was constructed there, the average concentration of worker exposure to vinyl chloride was reduced to be 0.46 ppm, which was below the Threshold Limit Value, 1 ppm. Also, the removal efficiency rate of vinyl chloride attained by local exhaust ventilation was 85.3%. It was a statistically significant (p<0.01).

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Gas Permeation Properties of Polymeric Membranes for Biosensor Prepared from Poly(vinyl chloride) Derivatives (Poly(vinyl chloride) 유도체로부터 제조된 바이오센서용 고분자막의 기체 투과특성)

  • Lim, Chun-Won;Kim, Wan-Young;Lee, Youn-Sik;Yoon, Jeong-Won;Jeong, Yong-Seob
    • Applied Chemistry for Engineering
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    • v.10 no.3
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    • pp.362-366
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    • 1999
  • Membranes for biosensor were prepared from poly(vinyl chloride) (PVC)l derivatives using the solution casting method, and their gas permeabilities were studied. The polymer membranes dried slowly in air showed higher permeability coefficients than those dried in vacuum. The permeabilily coefficients of carboxylated poly(vinyl chloride) (CPVC) membranes for $O_2$ and $CO_2$ decreased as the pressure of the feed gas increased. The addition of dioctylphthalate (DOP) enhanced the permeation rates for $O_2$ and $CO_2$. For example, the permeability coefficients of CPVC membranes containing 30 wt. % DOP for $O_2$ and $CO_2$ at 100 psig were 2.03 and 0.96 Barrer, respectively, which were about 4~5 times higher than those of the membranes without DOP. Poly(vinyl chloride-co-vinyl acetate-co-vinyl alcohol) (Syn-PVCAcAl) obtained by hydrolysis of poly(vinyl chloride-co-vinyl acetate (PVCA) showed a higher permeability coefficient for $CO_2$ in the presence of DOP than that for commercial PVCAcAl, but did not show any significant difference in permeability for $O_2$.

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Self Diffusion Coefficients and Free Hole Volumes of Poly(acrylonitrile)-poly(vinyl chloride) Copolymers (Poly(acrylonitrile)-poly(vinyl chloride) 공중합체의 자체 확산 계수와 유동 자유 홀부피)

  • Kim, Nam-Jeong
    • Elastomers and Composites
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    • v.46 no.3
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    • pp.245-250
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    • 2011
  • The self diffusions and hole volumes of amorphous region of poly(acrylonitrile)-poly(vinyl chloride) fibers were investigated by experiments of stress relaxation. The experiments of stress relaxation were carried out using the tensile tester with the solvent chamber. The flow parameters of filament fibers were obtained by applying the experimental stress relaxation curves to the theoretical equation of stress relaxation. From the flow parameters, the hole volumes, self diffusions, viscosities and thermodynamic parameters of solid polymers were calculated. It was observed that the flow parameters of these samples are directly related to the hole volumes, self diffusions and flow activation energies of flow segments.

Monte Carlo Simulation of the Molecular Properties of Poly(vinyl chloride) and Poly(vinyl alcohol) Melts

  • Moon, Sung-Doo;Kang, Young-Soo;Lee, Dong-J.
    • Macromolecular research
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    • v.15 no.6
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    • pp.491-497
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    • 2007
  • NPT Monte Carlo simulations were performed to calculate the molecular properties of syndiotactic poly(vinyl chloride) (PVC) and syndiotactic poly(vinyl alcohol) (PVA) melts using the configurational bias Monte Carlo move, concerted rotation, reptation, and volume fluctuation. The density, mean square backbone end-to-end distance, mean square radius of gyration, fractional free-volume distribution, distribution of torsional angles, small molecule solubility constant, and radial distribution function of PVC at 0.1 MPa and above the glass transition temperature were calculated/measured, and those of PVA were calculated. The calculated results were compared with the corresponding experimental data and discussed. The calculated densities of PVC and PVA were smaller than the experimental values, probably due to the very low molecular weight of the model polymer used in the simulation. The fractional free-volume distribution and radial distribution function for PVC and PVA were nearly independent of temperature.

Miscibility and Mechanical Properties of Polycaprolactone-polyamide Block Copolymer/Poly(vinyl chloride) Blend (Polycaprolactone-폴리아미드 블록공중합체/Poly(vinyl chloride) 블렌드의 상용성과 기계적 성질)

  • 안소봉;이하용;정한모
    • Polymer Korea
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    • v.24 no.1
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    • pp.128-132
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    • 2000
  • The miscibility between poly(vinyl chloride) (PVC) and polycaprolactone (PCL)-polyamide block copolymer whose content of PCL block is 62.7 wt%, was studied by differential scanning calorimetry. The PCL segment in the block copolymer and PVC has the miscibility showing single glass transition temperature (T$_{g}$). The miscible PVC molecule inhibited the crystallization of PCL segment, making an amorphous homogeneous phase of PCL and PVC segments at high PVC content. The blends had rubber elasticity at the temperature range between the T$_{g}$ of amorphous homogeneous phase of PCL and PVC segments and the melting temperature of polyamide segment, when both phases coexist.ist.

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Experimental and Theory for Relaxation Spectrum of Polyacrylonitrile-Poly(vinyl chloride) Copolymers (Polyacrylonitrile-Poly(vinyl chloride) 공중합체 완화스펙트럼의 실험과 이론적인 고찰)

  • Kim, Nam-Jeong
    • Polymer Korea
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    • v.35 no.3
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    • pp.232-237
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    • 2011
  • The relaxation spectra of polyacrylonitrile-poly(vinyl chloride) copolymer filament fibers were obtained by applying the experimental stress relaxation curves to the theoretical equation of relaxation spectrum. The theoretical equation of relaxation spectrum was derived from the Ree-Eyring and Maxwell model. The experimental of stress relaxation was carried out using a tensile tester with a solvent chamber. The determination of relaxation spectra was performed by computer calculation. From the relaxation spectra, the fine structures, viscoelastic properties and hole volumes of solid polymers were studied. It was observed that the relaxation spectra of these samples were directly related to the distribution of molecular weights and self diffusions of flow segments.

Preparation and Electrical Properties of Conducting Poly (vinyl Chloride) IPoly (aniline) Composites (전도선 Poly(vinyl Chloride)/Poly(aniline) 복합체의 제조 및 전기적 성질)

  • 이민구;한명희;김병일;박연홈
    • Textile Science and Engineering
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    • v.29 no.12
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    • pp.58-66
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    • 1992
  • Electrically conducting poly(vinyl chloride)Ipoly(aniline) (PVC/PANi) composite films were prepared by exposing PVC films containing ferric chloride to aniline vapor under various polymerization conditions. Their electrical and physical properties and morphologies were stu-died. Hydrochloric acid was used for the preparation of protonated PVC/PANi composite films. The electrical conductivity of PVC/PANi composite films lie in the range of 1O- 7~1O- $^2$ S/cm, depending on the preparation conditions such as the concentration of ferric chloride and hydro-chloric acid, and polymerization temperature. The formation of PANi in PVC matrix was confirmed by FT-IR spectroscopy and scanning electron microscopy.

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A Study on the Permselectivity of Anionically Charged Poly(vinyl alcohol) Membranes (음이온 하전 Poly(vinyl alcohol) 막에서의 이온 선택투과에 관한 연구)

  • 이신희;최해욱;박수민
    • Textile Science and Engineering
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    • v.37 no.9
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    • pp.524-532
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    • 2000
  • The permeability of sodium chloride, potassium chloride, and tetra-ethyl-ammonium chloride salt solution through anionically charged poly(vinyl alcohol) membrane was determined at 25${\pm}$0.1 $^{\circ}C$. The membranes used were poly(vinyl alcohol-co-itaconic acid) copolymer membranes. Plots of the salt concentration in the membrane versus the outer solution concentration indicated partition type isotherm in this experiment. The membrane permeability as a function of the salt concentration was analysed by means of the T.M.S theory. In the case of potassium chloride, sodium chloride, and tetraethylammonium chloride, the permeability coefficients of the cation in water-swollen membranes decreased with increasing stokes radius of the cation, i.e., KCl>NaCl>$(CH_{3}CH_{2})_{4}NCI$. The sequence was explained by considering the partition and hydration of the ions in these hydrophilic membranes. Ionic mobility ratio in these membranes decreased with increasing stokes radius of the cations as in bulk aqueous solution. The effectiveness of the fixed charged density was found on the ionic species and was explained by considering the counter ions bound by the anionically charged membrane.

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Preparation of Conducting Poly(vinyl chloride) /poly(pyrrole) Composites by Electrochemical Synthesis and Their Electrical Properties (전기화학적 합성에 의한 전도성 Poly(vinyl chloride)/poly(pyrrole) 복합체의 제조와 그 전기적 성질)

  • Bang, Gwang-Eun;Han, Myeong-Hui;Park, Yeon-Heum
    • Textile Science and Engineering
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    • v.31 no.12
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    • pp.1003-1011
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    • 1994
  • Electrically conducting poly(vinyl chloride) (PVC)/poly(pyrrole) (PPy) composite films were prepared by electrochemical synthesis of pyrrole in an insulating PVC matrix under various polymerization conditions and their electrical properties were studied. The conductivity of PVC/PPy composite films peeled off from platinum electrode lie in the range of 10-1~10-2S/cm. depending on the polymerization condition, the conductivity of composite films has increased with the increase of concentration of pyrrole and electrolyte. Also the composite has shown the highest conductivity when the applied potential during polymerization was 1.8V and the polymerization temperature was 3$0^{\circ}C$.

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A Study on Solution Blend of Poly(vinyl chloride) with Poly(VC-co-AN) (폴리염화비닐(PVC)/염화비닐-아크릴로니트릴 공중합체의 용액 블렌드에 관한 연구)

  • Lee, Soo;Oh, Gang-Seok;Kim, Seung-Ryung;Oh, Young-Se
    • Polymer Korea
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    • v.26 no.5
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    • pp.559-567
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    • 2002
  • Poly (vinyl chloride) was blended with blended with vinyl chloride-acrylonitrile copolymers (MO-01 : M$\sub$w/=199049, AN=22.79%, MO-02 : M$\sub$w/=238523, AN=47.03%, MO-03 : M$\sub$w/=289496, AN=52.49%, MO-04 : M$\sub$w/=341837, AN=58.68% by mixing dimethylformamide (DMF) solution of each polymer and their morphology, viscosity, viscoelastic and mechanical properties were studied. Blends of PVC and MO-01 showed a homogeneous morphology. On the contrary, the other copolymer blends showed a large phase separation with spherical domains. Miscibility of blends of PVC and MO-01 was shown to be better than that of blends of other copolymers from morphological and viscoelastic studies. Even though blends of PVC and MO-01 were observed to be the considerable compatibility at a composition of PVC/MO-01=90/10, the mechanical properties of blend films were not improved too much in most blend cases.