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Abstract
AbstractA computer program has been adapted for use with the Sofica Light Scattering Photometer and extended for application to block copolymer studies. In the first part of the program, which is equally suitable for homopolymers and copolymers alike, the apparent molecular weight, Mapp, radius of gyration 〈S2〉1/2, and the virial coefficients A2, A3 are obtained in individual solvents. In the second part, M̄w and the parameters characterizing the heterogeneity in composition of the copolymer are calculated. This is achieved by solving three simultaneous equations from all combinations of experiments in six or more solvents with different refractive index increments. The first stage has been tested using data from a sample of polystyrene. The complete program has been applied to data originally treated by the usual graphical methods. Finally, the parameters derived by the two techniques are compared and discussed.
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