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Thermodynamics of copolymer solutions: How the pair of interactions can contribute to the overall effect

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Bercea M., Wolf B.A.

Editorial: ACS, The Journal of Physical Chemistry B, 118, p.9414-9419, 2014.


Vapor pressure measurements were performed for solutions of poly(methyl methacrylate-ran-tert-butyl methacrylate) with different weight fractions of tert-butyl methacrylate units, and their parental homopolymers in chloroform at 323 K, over a large domain of concentrations. The Flory-Huggins interaction parameters obtained from these experimental investigations show complex dependences of the Flory-Huggins interaction parameter on concentration and copolymer composition. This behavior can be modeled by taking into account an approach which considers the ability of the polymers to rearrange in a response to changes in their molecular surroundings [Adv. Polym. Sci. 2011, 238, 1-66]. According to this concept, the mixing process is subdivided into two clearly separable steps and accounts for the specific interactions between the solvent and copolymer segments.

Cuvinte cheie: pair of interactions, random copolymer, Flory-Huggins interaction parameter, Opening intersegmental contacts, Conformational relaxation