• Hydrogen Bond Effect on Chain Behavior at the Semidilute Regime of Poly(vinyl alcohol) Aqueous Solution
  • Park IH, Yu YC, Park KS, Lee DI, Lyoo WS
  • 폴리(비닐 알코올) 수용액의 준희박농도 영역에서 사슬 거동에 대한 수소결합의 효과
  • 박일현, 유영철, 박기상, 이동일, 류원석
Abstract
In order to investigate the structure and dynamics of atatic poly(vinyl alcohol)(PVA)/water system, laser light scattering experiment has been done in the semi-dilute concentration regime at 25 ℃. The scattering intensity I(q) can be analyzed with the fractal equation of I(q)∼q-m instead of Onstein-Zernike type equation. The fractal dimensionality m was found to be constant after reaching the plateau value of m＝2.6±0.3 above C＝3 wt%. The time correlation function of dynamic light scattering has always two different modes such as fast mode and slow one. The cooperative diffusion of fast mode showed concentration independence contrary to the reptation theory's concentration dependent exponent of 3/4. The slow mode can be interpreted as the motion of large scale heterogeneities and its strong concentration dependence is apparent with a large negative exponent of -3.0. It is considered that the stereo-regular arrangement with four successive meso units of -OH plays as a key role in forming such heterogeneity.

어택틱 폴리(비닐 알코올)(PVA) 수용액 시스템의 준희박농도에서의 고분자 사슬의 구조 및 거동을 살펴보기 위하여, 온도 25 ℃에서 광산란 실험을 실시하였다. 산란 벡터 q에서 얻은 산란광의 세기 I(q)는 Onstein- Zernike 식으로 해석이 불가능하여 단순히 I(q)∼q-m을 이용하여 fractal 차원 m을 얻었다. 그 결과 농도 3 wt% 이상에서는 m＝2.6±0.3으로 일정하게 유지되었다. 동적 광산란으로 얻은 시간상관함수에는 항상 빠른 거동과 느린 거동의 두 종류가 공존하였으며, 빠른 거동의 협동확산계수는 reptation 이론의 농도의존지수 값(＝3/4)과 달리 농도 의존성이 거의 나타나지 않았다. 또한 느린 거동은 거대한 크기의 불균일 영역대의 운동으로 해석되며, 이 거동의 농도지수는 -3.0으로써 매우 강한 농도 의존성을 보여 주었다. 이 불균일 영역대의 형성에는 어택틱 PVA의 -OH기 4개의 메소(meso)가 입체 규칙적으로 배향한 부분이 매우 중요한 역할을 하는 것으로 생각되어진다.

Keywords: poly(vinyl alcohol); semidilute; hydrogen bond; light scattering; slow mode

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
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This Article

  • 2006; 30(3): 271-278

    Published online May 25, 2006

  • Received on Mar 6, 2006
  • Accepted on Apr 12, 2006