• Title, Summary, Keyword: PVDF-PVC

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XPS Analysis of PVDF Film Treated by Corona Discharge in Ethyl Methacrylate Vapor Atmosphere (에틸메타크릴레이트 증기 분위기에서 코로나 방전 처리한 PVDF 필름의 XPS 분석)

  • Moon, HuiKwon;Seomoon, Kyu
    • Applied Chemistry for Engineering
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    • v.27 no.6
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    • pp.627-632
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    • 2016
  • Ethyl methacrylate (EMA) monomer coupling onto the polyvinylidene fluoride (PVDF) film surface was attempted to enhance the interfacial adhesive force between PVDF-polyvinyl chloride (PVC) bilayer films via dielectric barrier corona discharge. The interfacial forces were quite enhanced when PVDF films were treated by corona discharge in an EMA 1% atmosphere. The contact angle of PVDF films decreased due to corona treatment. X-ray photoelectron spectroscopy (XPS) analysis showed that the carbon and oxygen content of the PVDF film surface increased with corona discharge while the fluoride content decreased. The curve fitting of XPS $C_{1s}$ peaks revealed that the non-polar C-C bonded carbon and oxygen-bonded carbon increased gradually with corona treatment, while the fluorine-bonded carbon decreased.

Comparison of Sampling Filters for Airborne Hexavalent Chromium in Plating Operation (도금공정 공기중 6가 크롬 시료채취여과지 비교에 관한 연구)

  • 이병규;신용철
    • Journal of Environmental Health Sciences
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    • v.29 no.2
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    • pp.69-76
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    • 2003
  • Hexavalent chromium may reduce on polyvinyl chloride (PVC) filter during sampling and storage of sample. Recently, new or modified filters for preventing Cr(VI) from the reduction has been introduced. Thus, this study was performed to compare the reduction behaviors of Cr(VI) on several sampling filters and to find the most appropriate filter for airborne Cr(VI) sampling in plating operation. The results were as follows. 1. There were statistically significant differences among PVC, polytetrafluoroethylene (PTFE). glass fiber (GF) and polyvinylidene fluoride (PVDF) filters in recovery rates of spiked Cr(VI) samples by storage time(p<0.05). There was no significant difference between PVC and PTFE filters(p>0.05). The PVC and PTFE filters showed higher recoveries than GF and PVDF filters(p<0.05). 2. The quartz fiber(QF) filter treated with an alkali solution(2% NaOH/3% Na$_2$CO$_3$, 1% NaOH) showed a significantly higher recovery of Cr(VI) by storage time than other filters(GF and QF filter)(p<0.05). There was no difference in recovery of Cr(VI) between alkali-treated and untreated GF it filters(p>0.05). But the QF filters treated with two alkali solution showed a significantly higher recovery than the untreated QF filter(p<0.05). There was no significant difference in recovery of Cr(VI) between QF filters treated with 1% NaOH and 2% NaOH/3% Na$_2$CO$_3$(p>0.05). In conclusion, treatment of QF fillers with alkali solution was most effective in protecting from the reduction of Cr(VI).

Preparation of Poly(vinyl chloride)-graft-poly(styrene sulfonic acid) Composite Nanofiltration Membranes (폴리비닐클로라이드-그래프트-폴리스티렌 술폰산 복합 나노막 제조)

  • Kim, Jong-Hak;Park, Jung-Tae;Koh, Joo-Hwan;Roh, Dong-Kyu;Seo, Jin-Ah
    • Membrane Journal
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    • v.18 no.2
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    • pp.132-137
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    • 2008
  • Nanofiltration membranes were prepared based on coating a sulfonated comb-like copolymer layer on top of a poly(vinylidene fluoride) (PVDF) support. The comb-like copolymer comprising poly(vinyl chloride) backbone and poly(styrene sulfonic acid) side chains, i.e. PVC-g-PSSA was synthesized by atom transfer radical polymerization (ATRP) using direct initiation of the secondary chlorines of PVC. The successful synthesis of graft copolymers were confirmed by nuclear magnetic resonance ($^1H$-NMR), FT-IR spectroscopy and wide angle X-ray scattering (WAXS). Composite nanofiltration membranes consisting PVC-g-PSSA as a top layer exhibited the increase of both rejections and solution flux with increasing PSSA concentration. This performance enhancement is presumably due to the increase of SO3H groups and membrane hydrophilicity. The rejections of composite membranes containing 71 wt% of PSSA were 88% for $Na_2SO_4$ and 33% for NaCl, and the solution flux were 26 and $34L/m^2h$, respectively, at 0.3 MPa pressure.

Test on the Mechanical Characteristics of Glass Fiber Membrane (유리섬유 막재의 역학적 특성에 관한 시험)

  • Park, Kang-Geun;Yoon, Sung-Kee
    • Journal of the Korean Association for Spatial Structures
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    • v.8 no.2
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    • pp.55-62
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    • 2008
  • Membrane structures are now used in various ways throughout the world with the merits of free shape, lightness, durability, sunlight transmittance and homogeneous material. The development of new membrane material opened up new possibility for the design of new building structures. Recently it was mainly used PVC, PVF, PVDF, PTFE, ETFE membrane for using the roofing material of membrane structures. Some problems of membrane materials have fire proofing, lack of strength, self cleaning capacity, tear resistance, durability, heat insulation, sound insulation and elasticity. For the solution of this problems, it will be tested the mechanical properties of membrane material about tensile strength, tearing resistance, etc.

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Basic Test on the Mechanical Characteristics of Polyester Membrane (폴리에스터 막재의 역학적 특성에 관한 기초시험)

  • Park, Kang-Geun;Yoon, Seoung-Hyun;Lee, Jang-Bok
    • Journal of the Korean Association for Spatial Structures
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    • v.10 no.2
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    • pp.127-134
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    • 2010
  • Membrane structures are now used in various ways throughout the world with the merits of free shape, lightness, durability, sunlight transmittance and homogeneous material. The development of new membrane material opened up new possibility for the design of new building structures. Recently it was mainly used PVC, PVF, PVDF, PTFE, ETFE membrane for using the roofing material of membrane structures. Some problems of architectural membrane have fire proofing, lack of strength, tear resistance, durability and elasticity. For the estimation of this problems, it will be tested the basic mechanical properties of membrane material about tensile strength, tearing resistance and repeated loading behavior. Elastic modulus is 337.30~1257.63N/$mm^2$, and strain is 17.90~26.91%.

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Fabrication of PVDF Line Focus Ultrasonic Transducer and its Application I. Fabrication and Characteristics Evaluation (직선집속 PVDF 초음파트랜스듀서의 제작과 응용 I. 제작 및 특성평가)

  • Yoon Hyuck-joon;Ha Kang-Iyeol;Kim Moo-joon
    • Proceedings of the Acoustical Society of Korea Conference
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    • pp.387-390
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    • 1999
  • 누설탄성표면파(Leaky Surface Acoustic Wave : LSAW) 측정에 사용하는 것을 목적으로 PVBF 압전막을 이용하여 직선집속 초음파트랜스듀서를 제작하고 그 특성을 평가하였다. 제작은 한쪽 면이 원통형 구조를 갖는 구리, 알루미늄, 3mmPVC-에폭시 3가지 재료를 배면층으로 사용하여 각각에 PVDF를 부착시켜서 수중에 음파를 방사하도록 구성하였고, 특성평가는 임펄스응답 특성과 음장 특성으로 나누어서 평가하였다. 임펄스응답 특성은 제작한 3종류의 집속 초음파트랜스듀서에 대해 실험적으로 측정하고, Mason 등가회로1)를 이용한 이론적 해석결과와 비교하였다. 음장특성 측정실험은 구리를 배면체로 하여 제작한 집속 초음파트랜스듀서에 대해서 실시하였고, 그 이론적인 계산결과는 Raylelgh-Somme-rfeld 회 절이론2)을 도입하여 초점면에 형성되는 음압분포를 계산하는 것으로 얻어졌다. 실험은 펄스 초음파 송수기 및 $2{\mu}m/step$으로 이동하는 정밀 x-y-z 스테이지를 컴퓨터에 연결하여 자동 측정하는 것으로 수행되었는데, 그 결과는 이론 해석결과와 비교적 잘 일치하였다.

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Preparation and characterization of a novel calcium-conducting polymer inclusion membrane: Part I

  • Darvishi, Reza;Sabet, Javad karimi;Esfahany, Mohsen Nasr
    • The Korean Journal of Chemical Engineering
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    • v.35 no.10
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    • pp.2052-2064
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    • 2018
  • The preparation and characterization of a novel type of castor oil-based polymer inclusion membrane (PIM) was investigated, focusing on its flux and selective recovery of $Ca^{2+}$ over competitive ions such as $K^+$, $Na^+$, and $Mg^{2+}$. The PIM contains a cross-linked high-molecular-weight green polyol (GPO) as a polymer base, benzene-18-crown-6 as a carrier, and an ionic liquid called 1-Butyl-3-methylimidazolium chloride as a plasticizer. GPO was first synthesized by a reaction between an epoxidized castor oil and a cellulose acetate, thereafter, cross-linked by isophorene isocyanate. The base polymer and the prepared PIM were characterized by gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), atomic force microscopy (AFM), thermogravimetric analysis (TGA), and X-ray diffraction (XRD). The FTIR results indicate that oxirane groups in the epoxidized castor oil molecules reacted with the primary hydroxyl groups of cellulose acetate chains. The contact angle measurement hints at the hydrophobic characteristics of the prepared membrane. Compared to the PVC-, CA-, and PVDF-based polymer inclusion membrane, the cured GPO-based PIM, showed higher selectivity and flux of calcium ions with the same composition. The greater stability and significantly higher surface roughness are further favorable features of the novel PIM.

Synthesis and Characterization of Proton Conducting Graft Copolymer Membranes (수소이온 전도성 가지형 공중합체 전해질막 제조 및 분석)

  • Roh, Dong Kyu;Koh, Jong Kwan;Seo, Jin Ah;Kim, Jong Hak
    • 한국신재생에너지학회:학술대회논문집
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    • pp.126.2-126.2
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    • 2010
  • The "grafting from" technology to prepare the well-defined microphase-separated structure of polymer using atom transfer radical polymerization (ATRP) will be introduced in this presentation. Various amphiphilic comb copolymers were synthesized through this approach using poly (vinylidene fluoride) (PVDF), poly (vinylidene fluoride-co-chlorotrifluoroethylene) (P(VDF-co-CTFE) and poly(vinyl chloride) (PVC) as a macroinitiator. Hydrophilic side chains such as poly (styrene sulfonic acid) (PSSA) or poly (sulfopropyl methacrylate) (PSPMA) were grafted from the mains chains using direct initiation of the chlorine atoms. The structure of mass transport channels has been controlled and fixed by crosslinking the hydrophobic domains, which also provides the greater mechanical properties of membranes. Successful synthesis and microphase-separated structure of the polymer were confirmed by $^1H$ NMR, FT-IR spectroscopy and TEM. The grafted/crosslinked membranes exhibited good mechanical properties (400 MPa of Young's modulus) and high thermal stability (up to $300^{\circ}C$), as determined by a universal testing machine (UTM) and TGA, respectively.

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