Comparison of two direct methods for estimating the cloud point curve of quasi-binary systems consisting of multicomponent polymers dissolved in a single solvent

✍ Scribed by Kenji Kamide; Shigenobu Matsuda; Hironobu Shirataki

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 883 KB
• Volume: 26
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(90)90039-7

✦ Synopsis

An attempt was made to compare two direct methods, proposed by Kamide et al. and ~olc, for determining the cloud point curve (CPC) of a quasi-binary system consisting of a multicomponent polymer with the same chemical composition dissolved in a single solvent. Although both methods are based on the same modified Flory-Huggins theory combined with the principle of Gibbs' two phase equilibrium, the Kamide method is more general than the golc method because in the former the molecular weight-dependence of the z-parameter is fully considered. The procedure of direct integration employed in the Kamide method was concluded to be more general than the polynomial expansion procedure in the ~olc method. Systematic computer experiments on the CPC were carried out under the same operating conditions according to the above two methods and ~olc's method compared with our direct integration procedure. The Kamide method gave the CPC almost identical with that estimated by the ~olc method, but the former method has an advantage in accurate calculation of the CPC in the low polymer concentration region.