caa a22 4500 475763661 CHVBK 20180406123558.0 cr unu---uuuuu 170329e20000901xx s 000 0 eng 10.1007/s003960000359 doi (NATIONALLICENCE)springer-10.1007/s003960000359 The effect of molecular weight on the topography of thin films of blends of poly(4-bromostyrene) and polystyrene [Elektronische Daten] [S. Affrossman, M. Stamm] Blends of polystyrene and poly(4-bromostyrene) phase-separate during spin-casting onto silicon wafers to give a thin film with islands of poly(4-bromostyrene) in a sea of polystyrene. Variation of the molecular weights of the blend components shows that the poly- (4-bromostyrene) and polystyrene influence the film structure in different ways. For poly(4-bromostyrene) of a given molecular weight, the ratio of the observed feature height to the overall film thickness remained constant as the film thickness increased. Moreover, the mean height of the topographical features was independent of the polystyrene but decreased with the molecular weight of the brominated polymer. It is concluded that the substrate-poly(4-bromostyrene) interaction dominates the formation of topography and consequently, though the islands are poly(4-bromostyrene), the mean height of the topographical features is greater the lower the molecular weight of the brominated polymer. The polystyrene has a secondary role, altering the thermodynamics or viscosity of the blend, thereby controlling the number of islands formed: the higher the molecular weight of the polystyrene the greater the number of islands. Springer-Verlag Berlin Heidelberg, 2000 Key words Polymer blends nationallicence Thin films nationallicence Topography nationallicence Polystyrene nationallicence Molecular weight nationallicence Affrossman S. Department of Pure and Applied Chemistry University of Strathclyde Cathedral Street Glasgow G1 1XL, UK e-mail: s.affrossman@strath.ac.uk Tel.: +44-141-5482299 Fax: +44-141-5484822, GB aut Stamm M. Institut für Polymerforschung Dresden e.V., Hohe Strasse 6 Postfach 12 04 11 01005 Dresden Germany, DE aut https://doi.org/10.1007/s003960000359 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960000359 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Affrossman S. Department of Pure and Applied Chemistry University of Strathclyde Cathedral Street Glasgow G1 1XL, UK e-mail: s.affrossman@strath.ac.uk Tel.: +44-141-5482299 Fax: +44-141-5484822, GB aut NATIONALLICENCE 700 1- Stamm M. Institut für Polymerforschung Dresden e.V., Hohe Strasse 6 Postfach 12 04 11 01005 Dresden Germany, DE aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer