Anomalous Surface Relaxations of Branched-Polymer Melts

被引：36

作者：

Wang, Shih-fan ^{[1
]}

Yang, Sewoo ^{[1
]}

Lee, Jaesik ^{[1
]}

Akgun, Bulent ^{[2
,3
,4
]}

Wu, David T. ^{[5
,6
]}

Foster, Mark D. ^{[1
]}

机构：

[1] Univ Akron, Dept Polymer Sci, Akron, OH 44325 USA

[2] NIST, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA

[3] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

[4] Bogazici Univ, Dept Chem, TR-34342 Istanbul, Turkey

[5] Colorado Sch Mines, Dept Chem Engn, Golden, CO 80401 USA

[6] Colorado Sch Mines, Dept Chem, Golden, CO 80401 USA

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 06期

关键词：

GLASS-TRANSITION TEMPERATURES; POLY(METHYL METHACRYLATE); POLYSTYRENE FILMS; RHEOLOGY; DYNAMICS; FLUCTUATIONS; BEHAVIOR; LIQUIDS; MOTION;

D O I：

10.1103/PhysRevLett.111.068303

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The dynamics of thermally stimulated surface fluctuations of 100 nm thick films of long-branched polymers are measured for the first time. In contrast to comparable films of linear or cyclic chains that show no change in viscosity upon confinement, films of 6-pom, 6-star, and 6-end end-branched stars show viscosities, inferred from x-ray photon correlation spectroscopy, as much as 100 times higher than in the bulk. This difference varies in magnitude with chain architecture. Branching has a profound effect on confinement, even for these unentangled chains.

引用

页数：5

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