• 제목/요약/키워드: vinyl acetate

검색결과 384건 처리시간 0.041초

4,4시-아조비스(4-시아노발레릭산)을 이용한 아세트산비닐의 메탄올계 저온 용액중합 (Low-Temperature Solution Polymerization of Vinyl Acetate in Methanol Using 4,4시-Azobis(4-cyanovaleric acid) in Methanol)

  • Kwak, Jin-Woo;Lyoo, Won-Seok
    • 한국섬유공학회:학술대회논문집
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    • 한국섬유공학회 2003년도 가을 학술발표회 논문집
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    • pp.52-54
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    • 2003
  • Poly(vinyl alcohol) (PVA) obtained by the saponification of poly(vinyl ester) is a linear semicrystalline polymer; these polymers have been widely used as fibers for clothes and industries, binders, films, membranes, medicines for drug delivery system, and cancer cell-killing embolic materials. PVA fibers have high tensile and compressive strength, tensile modulus, and abrasion resistance because of the highest crystalline lattice modulus. (omitted)

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무유화 에멀젼 공중합법과 반응염법을 이용한 전기영동 고분자 컬러나노입자의 제조 (Preparation of Colored Electrophoretic Nanoparticles by Emusifier-Free Emulsion Polymerization and Reactive Dyeing)

  • 전진아;하재희;임민호;권용구
    • 폴리머
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    • 제34권6호
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    • pp.491-494
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    • 2010
  • 무유화 에멀젼 공중합법을 이용하여 180~200 nm의 지름을 가지는 단분산성 폴리(스티렌/디비닐벤젠/비닐 아세테이트) [poly(ST-co-DVB-co-VAc)] 고분자 나노입자를 합성하였으며, 제조된 단분산성 고분자 나노입자의 표면을 비누화반응을 통하여 개질하여 단분산성 폴리(스티렌/디비닐벤젠/비닐알코올) [poly(ST-co-DVB-co-VA)] 나노입자를 제조하였다. 합성된 입자를 반응염료와 반응시켜 적색과 청색 단분산성 폴리(스티렌/디비닐벤젠/비닐알코올) 나노입자를 제조하였으며, 입자의 형태, 분산성 및 표면전하를 전자현미경, 시차열분석기, UV/Vis 흡광기 및 제타 전하 측정장치를 이용하여 규명하였다.

고분자량 혼성배열 폴리비닐알코올/염료 복합체 필름의 제조 (Preparation of High Molecular Weight Atactic Poly(vinyl alcohol)/Dye Complex Film)

  • Park, Joo-Min;Kim, Sam-Soo;Lyoo, Won-Seok
    • 한국섬유공학회:학술대회논문집
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    • 한국섬유공학회 2003년도 봄 학술발표회 논문집
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    • pp.48-51
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    • 2003
  • Poly(vinyl alcohol) (PVA) obtained by the saponification of poly(vinyl ester) like poly(vinyl acetate) or poly(vinyl pivalate) is a linen. semicrystalline polymer, which have been widely used as fibers for clothes and industries, films, membranes, medicines for drug delivery system, and cancer cell-killing embolic materials[1-3]. PVA fibers and films have high tensile and compressive strengths, high tensile modulus, and good abrasion resistance due to its highest crystalline lattice modulus. (omitted)

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PVA/아조염료계 편광필름의 편광효율에 따른 혼성배열 폴리비닐알코올의 분자량 효과 (Effect of Molecular weight of Atactic Poly(vinyl alcohol) (PVA) on the Polarizing Efficiency of PVA/Azo Dye Polarizer)

  • Park, Joo-Min;Kim, Sam-Soo;Lyoo, Won-Seok
    • 한국섬유공학회:학술대회논문집
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    • 한국섬유공학회 2003년도 가을 학술발표회 논문집
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    • pp.104-107
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    • 2003
  • Poly(vinyl alcohol) (PVA) obtained by the saponification of poly(vinyl ester) like poly(vinyl acetate) o. poly(vinyl pivalate) is a linear semicrystalline polymer, which has been widely used as fibers for clothes and industries, films, membranes, medicines for drug delivery system, and cancer cell-killing embolic materials[1-3]. PVA fibers and films have high tensile and compressive strengths, high tensile modulus, and good abrasion resistance due to its highest crystalline lattice modulus. (omitted)

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Oxidized Acetate Starch as a New Surface Sizing Agent

  • Zhang, Guang-Hua;Lai, Zhi-Chao;Li, Hui;Wang, Zhou-Ni
    • 펄프종이기술
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    • 제41권5호
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    • pp.1-7
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    • 2009
  • Oxidized acetate starch was synthesized from corn oxidized starch and vinyl acetate. The sizing concentration and degree of substitution of modified starch on surface strength, smoothness and water resistance of the paper have been studied. The results showed that the surface strength, smoothness and other properties of paper sized by oxidized acetate starch is better than that of oxidized starch. When the degree of substitution of modified starch is from 0.04 to 0.14, the properties of paper sized by oxidized acetate starch have been improved more effectively.

Insulation resistance property of EVA (Ethylene-vinyl acetate) photovoltaic module encapsulants

  • 진가언;정태희;주영철;강기환;장효식
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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    • pp.424.1-424.1
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    • 2016
  • 태양전지 모듈의 봉지재로 사용되는 EVA(Ethylene-Vinyl acetate)는 외부의 환경으로부터 태양전지를 보호해주는 역할을 한다. 하지만 frame의 실링재나 glass edge 부분의 결함으로 인해 수분이 침투되어 모듈의 내부자재에 영향을 미치게 되며, 모듈의 효율 감소나 수명 단축의 원인이 된다. 이러한 결함을 줄이기 위해서는 EVA의 crosslinking degree, 절연 저항 특성을 향상시키는 것이 중요하다. 이에 본 연구에서는 EVA의 crosslinking degree를 보기 위해 soxhlet extraction method를 이용하여 gel content를 측정하였으며, 라미네이션 과정 중 curing time에 따른 gel content 변화를 확인하였다. 또한 이 실험을 바탕으로 gel content에 따른 절연 저항을 측정하여 EVA의 crosslinking degree에 의한 절연 저항 특성을 확인하였다.

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Synthesis and Characterization of Low Molecular Weight Poly(maleic anhydride-co-vinyl acetate) Copolymers

  • Yoon, Kee-Jong;Woo, Jong-Hyung;Seo, Young-Sam
    • 한국섬유공학회:학술대회논문집
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    • 한국섬유공학회 2003년도 The Korea-Japan Joint Symposium
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    • pp.63-64
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    • 2003
  • As a part of a research on the development of polymeric textile finishing agents, polymerization of low molecular weight copolymers containing maleic anhydride residues have been studied. In order to obtain low molecular weight poly(maleic anhydride-co-vinyl acetate) copolymers, the feed ratio of the two monomers and the concentrations of initiator and chain transfer agent were varied in the copolymerization. The copolymers were characterized using GPC, NMR, FTIR, DSC, and TGA. Copolymers with molecular weights in the range 2,150 to 6,630 have been prepared and characterized. The hydrolysis of the anhydride groups of the copolymer in water is also discussed.

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