Article
  • Shear-Induced Mixing and Spinodal Decomposition of the PSD/PB/DOP System
  • Ban YB, Nakatani AI, Han CC
  • 고분자 블랜드에서 보여지는 전단 응력으로 인한 혼합과정과 그 이후의 Spinodal Decomposition 현상
  • 반용병, Nakatani AI, Han CC
Abstract
Shear-induced homogenization of 8 wt% solutions of deuterated polystyrene and polybutadiene mixtures with off-critical composition was studied by small angle light scattering mothod. In the shear-induced state, the solution was found to be in single phase that the scattering pattern parallel to the flow being significantly supressed by shear, in comparison with those perpendicular to the flow. The early-stage unmixing behavior after the cessation of steady-state shear at S > Sc was also examined, the results of which indicate that anisotropic spinodal drtomposition of the mixture was found with different ordering process of qm and qm.

새로이 제작된 광산란 장치를 이용하여 다양한 전단 속도 하에서 고분자 블렌드 용액의 균일화 현상과 그 이후의 상분리 과정을 관찰하였다. 전체 고분자 농도가 8wt%로 일정한 PSD/PB/DOP계는 전형적인 UCST를 보여주는데, 상온에서는 두 상으로 존재하지만 전단 속도가 329 s-1 이상에서 흐름으로 인한 균일화가 일어난다. 또한 상분리가 일어나는 조건에서 전단 흐름에 대한 수평과 수직 성분의 qm과 Im의 성장 과정이 다르게 관측되었으며, 산란 패턴에서도 지금까지 보고되어져 온 결과와는 다른 비등방형태의 "spinodal ring"이 얻어졌다. 이러한 결과들은 상분리 메카니즘 이론을 정립하는데 필요한 또 하나의 실험 자료가 될 것이다.

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 1993; 17(5): 528-536

    Published online Sep 25, 1993