Light scattering characterization of thermodynamic interaction of polymers in dilute solution. Effect of experimental error and temperature |
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Authors: | Pavel Kratochvíl Dagmar Straková Jaroslav Stejskal Ondřej Procházka |
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Affiliation: | Institute of Macromolecular Chemistry, Czechoslovak Academy of Sciences, 162 06 Prague 6, Czechoslovakia |
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Abstract: | Interaction between non-identical polymer molecules in a dilute solution of a mixture of two polymers is quantitatively characterized by the interaction parameter A24, which is the second virial coefficient for interaction of unlike species. The value of A24 may be experimentally obtained by light scattering. The determination of A24 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 A24 with temperature has been observed for solutions of mixtures of polystyrene and poly(methyl methacrylate) in diethyl malonate in the range 25–100 C. This change in A24 reflects the increased mutual miscibility of the polymers in solution at elevated temperatures. |
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