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Conformational behavior of styrene-dymethylsiloxane block copolymers in dilute solution.

par Benchabane, Mahmed ;Van Leemput, Robert
Référence Journal of polymer science. Part A-2, Polymer physics, 23, 5, page (991-1000)
Publication Publié, 1985-05

Article révisé par les pairs

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Résumé :

To determine the behavior of a copolymer in dilute solution, a viscosity study has been performed on a polystyrene-polydimethylsiloxane block copolymer in three solvents presenting different thermodynamic conditions. The results are discussed in relation to a mixture of homopolymers and a segregated model. The unperturbed dimensions, obtained by the Stockmayer-Fixman method, are intermediate between those of the parent homopolymers. The intrinsic viscosity measured in a good solvent, toluene, was close to the weighted averages of those of the corresponding homopolymers of equal molecular weight, but higher in decalin and in butanone, theta solvents for PS and PDMS, respectively. According to the low value obtained for the interaction parameter, the chain is slightly expanded as a result of the interactions between the unlike monomer units. Both segregation and random conformation would probably occur, depending on the quality of the solvent.