Polymer(Korea) (폴리머)

The Polymer Society of Korea (한국고분자학회)
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The Effects of Molecular Weight Distribution on the Rheological Behavior of PVA/DMSO Solution Systems

PVA/DMSO 용액계의 유변학적 특성에 미치는 PVA의 분자량분포의 영향

  • 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)
  • 이은정 (한양대학교 응용화공생명공학부 분자시스템공학과) ;
  • 김병철 (한양대학교 응용화공생명공학부 분자시스템공학과)
  • Published : 2007.11.30
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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.

본 연구에서는 poly(vinyl alcohol)(PVA)를 dimethyl sulfoxide(DMSO)에 녹여 이 용액의 유변학적 특성에 미치는 PVA의 분자량분포의 영향에 관하여 고찰하였다. 동일 평균분자량인 경우에도 수지 혼합(resin blending)에 의해 분자량분포가 넓어지면 점도와 손실탄성률이 더 낮아짐을 알 수 있었다. 이것은 동일 평균 분자량의 경우 분자량분포가 넓은 PVA/DMSO 용액계의 자유체적이 증가되기 때문이라고 생각된다. 분자량 분포가 저장탄성률에 미치는 영향은, 14 wt%용액의 경우에는, 1.3 rad/sec보다 낮은 진동수 영역에서는 동일 평균분자량의 경우 분자량분포가 넓은 PVA/DMSO 용액계가 탄성이 더 크고, 1.3 rad/sec보다 높은 진동수 영역에서는 분자량분포가 좁은 PVA/DMSO 용액계가 탄성이 더 크게 측정되었다. 14 wt% 용액의 경우에 Modified Cole-Cole plot에서의 기울기는 분자량분포가 넓어지면 진동수에 따른 상전이 현상이 더 뚜렷해졌다.

Keywords

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