• 제목/요약/키워드: Chemical effect

검색결과 12,734건 처리시간 0.042초

여러 가지 전리수의 항산화 효과 (Antioxidation Effect of Various Electrolyzed Water)

  • 이윤배;류근걸;이종권;이미영;신은정;성시창;구대철
    • 한국산학기술학회:학술대회논문집
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    • 한국산학기술학회 2005년도 춘계학술발표논문집
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    • pp.318-320
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    • 2005
  • 노화방지에 효과가 있다고 알려진 환원 전리수의 항산화 작용을 검증하기 위하여 간단한 방법으로 여러 가지 이온 전리수의 항산화 효과를 측정하였다. Linoleic acid의 산소에 의한 반응을 억제하는 효과를 측정하여 비교 분석하였다. 알카리수인 환원 전리수가 비교적 항산화 효과가 높게 나왔고 산성인 산화전리수는 산패를 촉진하는 것으로 밝혀졌다.

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Effect of Poly(butyl acrylate)-Poly(methyl methacrylate) Rubber Particle Texture on the Toughening Behavior of Poly(methyl methacrylate)

  • Chung, Jae-Sik;Park, Kyung-Ran;Wu, Jong-Pyo;Han, Chang-Sun;Lee, Chan-Hong
    • Macromolecular Research
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    • 제9권2호
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    • pp.122-128
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    • 2001
  • Monodisperse composite latex particles with size of ca. 300 nm, which consist ofn-butyl acrylate as a soft phase and methyl methacrylate as a hard phase with different morphology, were synthesized by seeded multi-stage emulsion polymerization. Three types of composite latex particles including random-, core/shell-, and gradient-type particles were obtained by using different monomer feeding methods during semi-batch emulsion polymerization. Effect of poly(butyl acrylate)-poly(methyl methacrylate) rubber particle morphology on the mechanical and rheological properties of rubber toughened poly(methyl methacrylate) was investigated. Among three different rubber particles, the gradient-type rubber particle showed better toughening effect than others. No significant variation of rheological property of poly(methyl methacrylate)/rubber blends was observed for the different rubber particle morphology.

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PVA/PAM 막의 aging effect (Aging effect of poly(vinyl alcohol) membranes with poly(acrylic acid-co-maleic acid))

  • Hwang, Ho-Sang;Kim, Dae-Sik;Park, Ho-Bum;Rhim, Ji-Won;Lee, Young-Moo
    • 한국막학회:학술대회논문집
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    • 한국막학회 2004년도 춘계 총회 및 학술발표회
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    • pp.195-198
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    • 2004
  • In our previous study, the crosslinked PVA/PAM membrane was prepared to investigate the pervaporation performance, and analyzed by FT-IR and water swelling test. This main objective of this work was to investigate the aging effect of PVA/PAM membrane with swelling time.(omitted)

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Effect of a Silicone Defoamant on the Motion of Single Air Bubbles Rising in Lubricant

  • Shim, Joosup;Cho, Wonoh;Chung, Keunwoo;Kim, Woung Woon
    • KSTLE International Journal
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    • 제1권1호
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    • pp.52-58
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    • 2000
  • The velocity and motion of single air bubbles rising through lubricant have been experimentally investigated to test the effect of silicon defoamant The investigation reveals that the velocity is markedly retarded by the addition of small amount of silicone defoamant. This retardation of rising velocity of air bubbles is proposed by increasing of Drag force or reducing of Buoyancy force around the surfaces of the bubbles.

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