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The Effects of Molecular Weight Distribution on the Rheological Behavior of PVA/DMSO Solution Systems  

Lee, Eun-Jeoung (Department of Molecular System Engineering/Fiber & Polymer Engineering, Hanyang University)
Kim, Byoung-Chul (Department of Molecular System Engineering/Fiber & Polymer Engineering, Hanyang University)
Publication Information
Polymer(Korea) / v.31, no.6, 2007 , pp. 532-537 More about this Journal
Abstract
The rheological properties of the solutions of atactic poly(vinyl alcohol)(PVA) in dimethyl sulfoxide (DMSO) were investigated in terms of molecular weight distribution (MWD) of the polymer. The dynamic viscosity (${\eta}#$) and loss modulus (G") for the PVA/DMSO solutions with broader MWD were lower than those with narrower MWD at the similar $M_w$. It could be explained by the fact that the free volume for the solution with broader MWD at the similar $M_w$ was increased. The storage modulus(G#) of 14 wt% PVA/DMSO solutions with broader MWD was higher than that with narrower MWD at a lower frequency than 1.3 rad/sec, but lower than that with narrower MWD at a higher frequency (>1.3 rad/sec). The slopes of modified Cole-Cole plots of the 14 wt% solutions showed that as the MWD was broadened, the phase transition with frequency was more noticeable.
Keywords
PVA; DMSO; molecular weight distribution; rheological properties;
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