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Hydrogen Bond Effect on Chain Behavior at the Semidilute Regime of Poly(vinyl alcohol) Aqueous Solution  

Park Il-Hyun (Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
Yu Young-Chol (Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
Park Ki-Sang (Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
Lee Dong-Il (Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
Lyoo Won-Seok (School of Textile, Yeungnam University)
Publication Information
Polymer(Korea) / v.30, no.3, 2006 , pp. 271-278 More about this Journal
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 $25^{\circ}C$. The scattering intensity I(q) can be analyzed with the fractal equation of $I(q){\sim}q^{-m}$ instead of Onstein-Zernike type equation. The fractal dimensionality m was found to be constant after reaching the plateau value of $m=2.6{\pm}0.3$ above C=3wt%. 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 4o 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.
Keywords
poly (vinyl alcohol); semidilute; hydrogen bond; light scattering; slow mode;
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