Role of molecular architecture on the vitrification of polymer thin films

We show that thin film star-shaped macromolecules exhibit significant differences in their average vitrification behavior, in both magnitude and thickness dependence, from their linear analogs. This behavior is dictated by a combination of their functionality and arm length. Additionally, the glass...

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Bibliographic Details
Published inPhysical review letters Vol. 106; no. 12; p. 128301
Main Authors Glynos, Emmanouil, Frieberg, Bradley, Oh, Hyunjoon, Liu, Ming, Gidley, David W, Green, Peter F
Format Journal Article
LanguageEnglish
Published United States 25.03.2011
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Summary:We show that thin film star-shaped macromolecules exhibit significant differences in their average vitrification behavior, in both magnitude and thickness dependence, from their linear analogs. This behavior is dictated by a combination of their functionality and arm length. Additionally, the glass transition temperature at the free surface of a star-shaped molecule film may be higher than that of the interior, in contrast to their linear analogs where the opposite is true. These findings have implications for other properties, due largely to the origins, entropic, of this behavior.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.106.128301