【摘要】 用石英弹簧称重法测定了25℃时,丙酮与3种不同摩尔质量的单分散聚甲基丙烯酸丁酯溶液的汽液平衡.结果表明在实验误差范围内,相对蒸汽压ρ₁/ρ_?对液相质量分数w₁作图所得曲线与聚合物的摩尔质量无关.由实验数据计算所得Flory-Huggins相互作用参数X显著依赖于溶液浓度,聚合物摩尔质量也有轻微影响.用修正的Freed模型进行关联,取得了良好的效果.更多还原

【Abstract】 Vapor - liquid equilibria for mixtures of acetone and poly butyl methacrylate with three different molar masses from 17278 g/mol to 88059 g/mol were obtained at 25. 0℃ by using the Quartz - Spring gravimetric method. The reduced pressure p1/p°1 versus mass fraction W1 plots were found to be independent of the molar mass of the polymer within experimental error. The calculated Flory - Huggins interaction parameters X exhibit a strong concentration dependence. The molar mass of the polymer also exerted a definite influence. The experimental Flory - Huggings interaction parameters were correlated by the revised Freed model.更多还原