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Solvent Swelling of Roll-cast Triblock Copolymer Films by Ramon J. Albalak; Malcolm S. Capel; Edwin L. Thomas is a Materials Science article available to read on EtoBox.

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## Polystyrene-polybutadiene-polystyrene triblock copolymers were roll-cast from toluene solutions to form globally oriented films. As-processed films, containing process-related residual stresses, were exposed to solvent vapours. Three solvents were used in this study: toluene, which is a non-preferential solvent for polystyrene and polybutadiene; methyl-ethyl-ketone, which is a preferential solvent for the polystyrene blocks; and hexane, which is a preferential solvent for the polybutadiene block. Microstructural changes accompanying the solvent swelling of films with cylindrical and lamellar morphology were monitored using two-dimensional small angle X-ray scattering. Solvent swelling significantly improved the symmetry of the hexagonal packing of the cylindrical domains, which was initially distorted due to the roll-casting flow field. Solvent swelling was also found to improve the long range order in roll-cast film with lamellar morphology. Various phenomena were found to accompany the swelling and deswelling of films with both cylindrical and lamellar morphology with the three different solvents used. Especially intriguing results were observed for the case of swelling both m

Who reads Solvent Swelling of Roll-cast Triblock Copolymer Films?

Author

Ramon J. Albalak; Malcolm S. Capel; Edwin L. Thomas

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0032-3861)

Published

1998

Language

EN

Field

Materials Science (Physical Sciences)