Light scattering characterization of thermodynamic interaction of polymers in dilute solution. Effect of experimental error and temperature

✍ Scribed by Pavel Kratochvíl; Dagmar Straková; Jaroslav Stejskal; Ondřej Procházka

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 413 KB
• Volume: 19
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(83)90125-8

✦ Synopsis

Interaction between non-identical polymer molecules in a dilute solution of a mixture of two polymers is quantitativel) characterized by the interaction parameter A>t which is the second xirial coefficient for interaction of unlike species. The value of Az.~ may be experimentall) obtained by light scattering. The determination of AE4 is very sensitive to experimental error in the input data. particularly for mixtures in which one polymer is greatly in excess, and for mixtures of polymers having molecular weights differing by orders of magnitude. A slight rise in A2,, with temperalure has been observed for solutions of mixtures of polystyrene and poly[methyl methacrylale) in dieth)l inalonate in the range 25 100 C This change in A2,~ reflects the increased mutual miscibility of the polymers in solution at elevated temperatures.