Modulus, Confinement, and Temperature Effects on Surface Capillary Wave Dynamics in Bilayer Polymer Films Near the Glass Transition

被引：44

作者：

Evans, Christopher M. ^{[1
]}

Narayanan, Suresh ^{[2
]}

Jiang, Zhang ^{[2
]}

Torkelson, John M. ^{[1
,3
]}

机构：

[1] Northwestern Univ, Dept Chem & Biol Engn, Evanston, IL 60208 USA

[2] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[3] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 03期

关键词：

ELASTIC-MODULUS; LENGTH SCALE; THIN-FILMS; POLYSTYRENE; BEHAVIOR; RELAXATION; COPOLYMERS; SCATTERING; MOBILITY; IMPACT;

D O I：

10.1103/PhysRevLett.109.038302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report relaxation times (tau) for surface capillary waves on 27-127 nm polystyrene (PS) top layers in bilayer films using x-ray photon correlation spectroscopy. At similar to 10 degrees C above the PS glass transition temperature (T-g), tau tracks with underlayer modulus, being significantly smaller on softer substrates at low in-plane scattering wave vector. Relative to capillary wave theory, we also report stiffening behavior upon nanoconfinement of the PS layers. At PS T-g + 40 degrees C, both effects become negligible. We demonstrate how neighboring polymer domains impact dynamics over substantial length scales.

引用

页数：5

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