Crystalline−Amorphous Interaction in Relation to the Phase Diagrams of Binary Polymer Blends Containing a Crystalline Constituent

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• 作者：Pankaj Rathi ; Tsang-Min Huang ; Pratyush Dayal ; Thein Kyu
• 刊名：Journal of Physical Chemistry B
• 出版年：2008
• 出版时间：May 22, 2008
• 年：2008
• 卷：112
• 期：20
• 页码：6460 - 6466
• 全文大小：146K
• 年卷期：v.112,no.20(May 22, 2008)
• ISSN：1520-5207

文摘

The present article describes an equilibrium theory for determining binary phase diagrams of various crystalline−amorphous polymer blends by taking into account the contributions from both liquid−liquid phase separation between the constituents and solid−liquid phase transition of the crystalline component. An analytical expression for determining a crystal−amorphous interaction parameter is deduced based on the solid−liquid transition, involving the solidus and liquidus lines in conjunction with the coexistence curve of an upper critical solution temperature type. Of particular importance is that the crystalline-amorphous interaction parameter can be determined directly from the melting point depression data. The present analysis is therefore different from the conventional Flory−Huggins interaction parameter, which is associated with the liquid−liquid phase separation. The validity of the present theory is tested with the experimental phase diagrams of blends of poly(ethylene oxide)/diacrylate and poly(vinyl alcohol)/cellulose.