Thickness and composition dependence of the glass transition temperature in thin random copolymer films
SCIE
SCOPUS
- Title
- Thickness and composition dependence of the glass transition temperature in thin random copolymer films
- Authors
- Park, CH; Kim, JH; Ree, M; Sohn, BH; Jung, JC; Zin, WC
- Date Issued
- 2004-06-03
- Publisher
- ELSEVIER SCI LTD
- Abstract
- Glass transition temperatures (T-g) of thin poly(styrene-co-methyl methacrylate) and poly(2-vinyl pyridine-co-styrene) films coated on a native oxide surface of Si wafer (100) were measured by ellipsometry. The thickness dependence of T-g can be properly fitted by previously suggested equation developed for homopolymers, based upon a continuous multi-layer model, although one component in thin random copolymer films demonstrates a slightly favorable interaction between a substrate and thin film, and another demonstrates a strongly favorable interaction. Surface and interface have a strong influence on T-g of thin film coated on substrate: the surface has the effect of reducing T-g, whereas the interface increases the T-g according to the degree of interaction between a substrate and thin film. This degree of interaction can be quantified as an interaction parameter (k), and is dependent on the composition of random copolymers. For the estimation of k values of thin random copolymer films, we proposed a parallel type additive function (1/k(ran), = w(1)/k(1) + w(2)/k(2)) where w is a weight fraction of component. (C) 2004 Elsevier Ltd. All rights reserved.
- Keywords
- glass transition; thin film; random copolymer; POLYMER-FILMS; THERMAL-EXPANSION; POLYSTYRENE FILMS; SURFACE; SPECTROSCOPY; CONFINEMENT; INTERFACE; BEHAVIOR
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/29773
- DOI
- 10.1016/S0032-3861(04)00441-0
- ISSN
- 0032-3861
- Article Type
- Article
- Citation
- POLYMER, vol. 45, no. 13, page. 4507 - 4513, 2004-06-03
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