Modeling of Liquid−Liquid-Phase Separation in Linear Low-Density Polyethylene−Solvent Systems Using the Statistical Associating Fluid Theory Equation of State
Modeling of Liquid−Liquid-Phase Separation in Linear Low-Density Polyethylene−Solvent Systems Using the Statistical Associating Fluid Theory Equation of State
复制标题
使用统计关联流体理论状态方程对线性低密度聚乙烯-溶剂体系中的液-液相分离进行建模
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发表时间：
2002
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通讯作者：
R. D. Swindoll
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作者：
Prasanna K. Jog;Walter G Chapman;Sumnesh Gupta;R. D. Swindoll
统计缔合流体理论（SAFT）被用来模拟线性低密度聚乙烯（LLDPE）与己烷，庚烷和辛烷的溶液中的液-液相平衡。研究了温度、压力、聚合物浓度和聚合物分子量对相分离的影响。最后，还考虑了多分散性对浊点的影响。SAFT结果与de卢什等人的实验数据进行比较（Fluid Phase Equilib. 1996，117，40）。SAFT可以模拟聚合物在不同溶剂和不同状态下的相行为，只需一个可调参数。对于在己烷中的单分散聚合物，临界聚合物浓度相对于分子量的平方根的倒数是线性的。用多分散聚合物进行的计算表明，在低聚合物浓度下，多分散聚合物的浊点曲线与单分散聚合物的浊点曲线有本质上的不同。当聚合物浓度降低到临界值以下时…
The statistical associating fluid theory (SAFT) is used to model liquid−liquid-phase equilibria in solutions of linear low-density polyethylene (LLDPE) with hexane, heptane, and octane. The effect of temperature, pressure, polymer concentration, and polymer molecular weight on phase separation is studied. Finally, the effect of polydispersity on cloud point is also considered. SAFT results are compared with experimental data by de Loos et al. (Fluid Phase Equilib. 1996, 117, 40). SAFT can model the phase behavior of the polymer in different solvents at various state conditions with a single adjustable parameter. For a monodisperse polymer in hexane, the critical polymer concentration is linear with respect to the reciprocal of the square root of molecular weight. Calculations with a polydisperse polymer show that the cloud-point curve for a polydisperse polymer differs qualitatively from that of a monodisperse polymer at low polymer concentration. As the polymer concentration is decreased below the critic...