• 제목/요약/키워드: PEG400DMA

검색결과 3건 처리시간 0.017초

Photo-DSC를 사용한 에틸렌글리콜 단위 길이에 따른 다이메타크릴레이트의 광중합 전환률에 미치는 온도와 광개시제 농도의 영향 (The Effect of Temperature and Photoinitiator Concentration on Conversion of Photopolymerized Multiethylene Glycol Dimethacrylate by Photo-DSC)

  • 도현성;김대준;김현중;이영규
    • 접착 및 계면
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    • 제4권3호
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    • pp.14-20
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    • 2003
  • UV 경화에 사용되는 poly(ethylene glycol 400) dimethacrylate(PEGA400DMA)와 ethylene glycol dimethacrylate(EGDMA)를 사용하여 모노머(monomer)의 종류에 따른 경화거동과 광개시제의 양과 온도에 따른 경화 거동을 photo-DSC를 사용하여 살펴보았다. Ethylene glycol의 단위길이가 늘어날수록, 광개시제의 양이 증가할수록, 반응 온도가 높을수록 경화속도가 빠르게 일어났다. 또한 PEG400DMA의 반응속도가 EGDMA보다 느리게 나타났지만 전환률은 높게 나타남을 알 수 있었다.

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열분석기기를 이용한 메틸셀룰로오스/키토산 블랜드의 상용성에 관한 연구 (Studies on the Miscibility of Methylcellulose/Chitosan Blends by Thermogravimetric Analysis and Thermodynamic Mechanical Analysis)

  • 박준서;신기호
    • 한국포장학회지
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    • 제8권2호
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    • pp.18-26
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    • 2002
  • Films of methylcellulose(MC), chitosan and their blends were prepared using water and acid solution as a solvent. The transition behavior and miscibility of polymers and their blends were characterized by dynamic mechanical analysis(DMA) and thermogravimetric analysis(TGA). The DMA analysis of PEG400/MC blends has shown that PEG400 was compatible with MC and was effective plasticizer since the curves of $tan{\delta}$ against temperature exhibited single peak, corresponding to single glass transition temperature, which were displaced to lower values with increasing PEG400 content. Results of DMA analysis and TGA analysis of MC/chitosan blends indicate that there are some miscibility between MC and chitosan in the blends, attributed to the similarities between two polysaccharides and interactions of two polymers in the blends. The inclusion of PEG400 in the blends increase the miscibility between two components in the blends.

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PVA/메틸셀루로스 블랜드의 상용성에 관한 연구 (Studies on the Compatability of the blend of PVA and Methyl cellulose)

  • 박준서;박장우
    • 한국포장학회지
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    • 제5권2호
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    • pp.1-8
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    • 1999
  • The state of compatability of poly(vinyl alcohol)(PVA) and methyl cellulose(MC), prepared by an aqueous solution casting, were investigated over the entire compositions by dynamical mechanical analyzer(DMA) and differential scanning calorimetry(DSC). The glass transition temperatures of the blends, estimated by DMA, indicate that the blends of PVA and MC showed a definite degree of partial miscibility by showing two glass transition temperatures below 80 wt % MC contents in the blends and one glass transition temperature above 80 wt % of MC contents. The DSC results show a depression of melting point and crystallization temperature of PVA in the blends containing more than 80 wt % MC. This indicates that a considerable compatibility in the blend above 80 wt % MC contents may be attribute to the presence of interaction of hydroxyl groups of component polymers through hydrogen bonding. The DMA study of the effect of plasticizer on the polymers showed that water was a good plasticizer for PVA and PEG400 for MC. The addition of water and PEG400 in the blends showed a synergic plasticizing effect on these blends, which resulted in the large extent of the improvement of the compatibility. The elongation of PVA, MC and blonds was found to increase with addition of PEG400 in the blends, but the tensile strength to decrease with addition of plasticizer.

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