Glass Transition Behavior of PS Films on Grafted PS Substrates

被引：40

作者：

Lee, Hoyeon ^{[1
]}

Ahn, Hyungju ^{[1
]}

Naidu, Sudhakar ^{[1
]}

Seong, Baek Seok ^{[2
]}

Ryu, Du Yeol ^{[1
]}

Trombly, David M. ^{[3
]}

Ganesan, Venkat ^{[3
]}

机构：

[1] Yonsei Univ, Dept Chem & Biomol Engn, Seoul 120749, South Korea

[2] Korea Atom Res Inst, Taejon 430200, South Korea

[3] Univ Texas Austin, Dept Chem Engn, Austin, TX 78712 USA

来源：

MACROMOLECULES | 2010年 / 43卷 / 23期

基金：

美国国家科学基金会;

关键词：

THIN POLYMER-FILMS; THERMAL-EXPANSION; POLY(METHYL METHACRYLATE); THICKNESS DEPENDENCE; WETTING BEHAVIOR; TEMPERATURE; SURFACE; HOMOPOLYMER; INTERFACE; CONFINEMENT;

D O I：

10.1021/ma101743u

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

We present experimental results for the glass transition behavior of polystyrene (PS) films on grafted PS layers of the same chemical identity as a function of film thickness. Our results suggest that the T-g of PS films on brush substrates decreases with decreasing film thickness. The thickness dependence of T-g was observed to be more pronounced for the films on the shorter brushes with the high grafting density. We propose a qualitative rationalization of the observations by invoking both interfacial energy considerations as well as by adapting the percolation model for the glass transition of polymer films.

引用

页码：9892 / 9898

页数：7

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