Glassy Dynamics and Glass Transition in Thin Polymer Layers of PMMA Deposited on Different Substrates

被引：83

作者：

Erber, Michael ^{[2
]}

Tress, Martin ^{[1
]}

Mapesa, Emmanuel U. ^{[1
]}

Serghei, Anatoli ^{[3
]}

Eichhorn, Klaus-Jochen ^{[2
]}

Voit, Brigitte ^{[2
]}

Kremer, Friedrich ^{[1
]}

机构：

[1] Univ Leipzig, Inst Expt Phys 1, D-04103 Leipzig, Germany

[2] Leibniz Inst Polymer Res Dresden eV, D-01069 Dresden, Germany

[3] Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA

来源：

MACROMOLECULES | 2010年 / 43卷 / 18期

关键词：

POLY(METHYL METHACRYLATE); TEMPERATURE; FILMS; CONFINEMENT; MOBILITY; PROBE;

D O I：

10.1021/ma100912r

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Spectroscopic vis-ellipsometry and broadband dielectric spectroscopy (BDS) are combined to study the glassy dynamics of thin (>= 10 nm) layers of atactic poly(methyl methacrylate) (PM MA) annealed and measured under identical conditions. In order to unravel a possible effect of the underlying substrate, the interfacial interactions are systematically modified ranging from strong attractive interactions for covalently bonded PM MA brushes with high grafting density and for native silicon oxide (Si/SiOx) to weak and strong repulsive interactions as realized by Au-coated and HMDS-treated Si/SiOx surfaces, respectively. Down to the thinnest analyzed PM MA layers and independently from the applied substrate, both methods deliver-within the experimental accuracy (+/- 1 K for BDS and +/- 2 K for ellipsometry)-a coinciding result. The glassy dynamics arc not altered due to the one-dimensional confinement in these thin polymer layers. The results are discussed with respect to the highly controversial literature and the impact of the preparative conditions.

引用

页码：7729 / 7733

页数：5

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