<b>Shape and Property Change by Mixing Methods of Binary Mixtures of </b><b>Cross-linked Polystyrene and Liquid Polybutadiene </b>

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  • Komeda Masahiro
    Molecular Engineering Institute, Kindai University
  • Matsumoto Kozo
    Molecular Engineering Institute, Kindai University Department of Biological &Environmental Chemistry, Kindai University
  • Endo Takeshi
    Molecular Engineering Institute, Kindai University

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  • <b>架橋ポリスチレン／液状ポリブタジエン二成分混合手法による </b><b>性状変化 </b>
  • 架橋ポリスチレン/液状ポリブタジエン二成分混合手法による性状変化
  • カケハシ ポリスチレン/エキジョウ ポリブタジエン ニ セイブン コンゴウ シュホウ ニ ヨル セイジョウ ヘンカ

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<p>Binary mixture materials were prepared by mixing cross-linked polystyrene and liquid polybutadiene by several methods and their shapes and thermal phase transition behaviors were examined. Evaporating dichloromethane of crosslinked polystyrene and polybutadiene (1/1 wt/wt) solution in dichloromethane at 40 ℃ under reduced pressure gave solid/liquid two-phase-separated materials. Differential scanning calorimetry (DSC) of the materials showed that they had two glass transition temperature (Tg)s, one was Tg(-91.0 ℃) attributed to polybutadiene and the other was Tg (103.1 ℃) attributed to polystyrene. They coincided well with those of original polybutadiene and cross-linked polystyrene, respectively. On the other hand, freeze-drying of the cross-linked polystyrene and polybutadiene (1/1 wt/wt) solution in 1,4-dioxane gave powdered solid materials. DSC analysis of these materials revealed higher temperature shift of polybutadiene Tg (-88.8 ℃) along with lower temperature shift of polystyrene Tg (97.8 ℃). These observations indicated that binary materials with quite different shapes and properties can be prepared by varying the mixing methods.</p>

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