Polystyrene with different topologies: Study of the glass transition temperature in confined geometry of thin films

被引：15

作者：

Erber, M. ^{[1
]}

Georgi, U. ^{[1
]}

Mueller, J. ^{[1
]}

Eichhorn, K-J. ^{[1
]}

Voit, B. ^{[1
]}

机构：

[1] Leibniz Inst Polymerforsch Dresden eV, D-01069 Dresden, Germany

来源：

EUROPEAN POLYMER JOURNAL | 2010年 / 46卷 / 12期

关键词：

Glass transition; Thin films; Polymer; Confinement effects; Topology; POLYMER-FILMS; HYPERBRANCHED POLYESTERS; DYNAMICS; BEHAVIOR; RELAXATIONS; INTERFACE; MOBILITY; LAYERS; SCALE; HEAT;

D O I：

10.1016/j.eurpolymj.2010.09.009

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The glass transition behaviour of polystyrene (PS) with systematically varied topologies (linear, star-like and hyperbranched) confined in nanoscalic films was studied by means of spectroscopic vis-ellipsometry. All applied PS samples showed no or only a marginal depression in glass transition temperature T(g) in the order hyperbranched PS (5 K)> starlike PS (3 K) > linear PS (0 K) for the thinnest films analyzed. The T(g) behaviour was accompanied by the observation of the film density in dependence of film thickness. A maximum decreased density of about 7% for hyperbranched PS and 5% for star-like PS and again no deviation in density of bulk was found for linear PS. Accordingly, we deduce from these results considering an experimental accuracy of about +/- 2 K for T(g) and up to +/- 3% for film density, that the polymer topology only barely influences T(g) in the confinement of thin films. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：2240 / 2246

页数：7

共 40 条

[1] Effects of confinement on material behaviour at the nanometre size scale [J].

Alcoutlabi, M ;

McKenna, GB .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2005, 17 (15) :R461-R524

[2] SEGMENTAL MOTIONS OF CIS-POLYISOPRENE IN THE BULK STATE - INTERPRETATION OF DIELECTRIC-RELAXATION DATA [J].

BAHAR, I ;

ERMAN, B ;

KREMER, F ;

FISCHER, EW .

MACROMOLECULES, 1992, 25 (02) :816-825

[3]

BRDICKA R, 1958, GRUNDLAGEN PHYSIKALI

[4] New methodologies in the construction of dendritic materials [J].

Carlmark, Anna ;

Hawker, Craig J. ;

Hult, Anders ;

Malkoch, Michael .

CHEMICAL SOCIETY REVIEWS, 2009, 38 (02) :352-362

[5] Probing glass transition of ultrathin polymer films at a time scale of seconds using fast differential scanning calorimetry [J].

Efremov, MY ;

Olson, EA ;

Zhang, M ;

Zhang, ZS ;

Allen, LH .

MACROMOLECULES, 2004, 37 (12) :4607-4616

[6]

EFREMOV MY, 2003, PHYS REV LETT, V2, P91

[7] Variations in the glass transition temperature of polyester with special architectures confined in thin films [J].

Erber, M. ;

Khalyavina, A. ;

Eichhorn, K. -J. ;

Voit, B. I. .

POLYMER, 2010, 51 (01) :129-135

[8] The glass transition in thin polymer films [J].

Forrest, JA ;

Dalnoki-Veress, K .

ADVANCES IN COLLOID AND INTERFACE SCIENCE, 2001, 94 (1-3) :167-196

[9] Interface and chain confinement effects on the glass transition temperature of thin polymer films [J].

Forrest, JA ;

DalnokiVeress, K ;

Dutcher, JR .

PHYSICAL REVIEW E, 1997, 56 (05) :5705-5716

[10]

Fujiwara H., 2009, SPECTROSCOPIC ELLIPS

← 1 2 3 4 →