The measurements of coexistence curves and critical behavior of a binary mixture with a high molecular weight polymer

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• 作者：Jinshou Wang ; ^a ; ^{wangjsh04@lzu.cn"" rel=""nofollow} ; Youmeng Dan^a ; Yan Yang^a ; Yan Wang^a ; Yuanfang Hu^a ; Yan Xie^a
• 关键词：Crossover ; Polymer
• 刊名：Journal of Molecular Liquids
• 出版年：2011
• 出版时间：1 July 2011
• 年：2011
• 卷：161
• 期：3
• 页码：115-119
• 全文大小：462 K

文摘

The critical behavior of solutions of poly (diallydimethylammonium chloride) (PDDAC, M_w = 3.2 × 10⁵) in the critical binary mixture of isobutyric acid (I) + water (W) was studied by the refractive index measurements. The measurements were performed at three different PDDAC concentrations near and far away from the critical point. We observed that the critical temperatures increase linearly with increasing the concentration of PDDAC. As the distance from the critical point increases, the system exhibits a crossover from the renormalized Ising critical behavior to the mean-field one. For the solutions with the highest PDDAC concentration, experiments suggest a crossover to tricritical behavior.