Revealed Architectures of Adsorbed Polymer Chains at Solid-Polymer Melt Interfaces

被引：230

作者：

Gin, Peter ^{[1
]}

Jiang, Naisheng ^{[1
]}

Liang, Chen ^{[1
]}

Taniguchi, Takashi ^{[2
]}

Akgun, Bulent ^{[3
,4
]}

Satija, Sushil K. ^{[3
]}

Endoh, Maya K. ^{[1
]}

Koga, Tadanori ^{[1
,5
]}

机构：

[1] SUNY Stony Brook, Dept Mat Sci & Engn, Stony Brook, NY 11794 USA

[2] Kyoto Univ, Dept Chem Engn, Grad Sch Engn, Nishikyo Ku, Kyoto 6158510, Japan

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

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

[5] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 26期

基金：

美国国家科学基金会;

关键词：

BULK BEHAVIOR; IRREVERSIBLE ADSORPTION; THIN-FILMS; TEMPERATURE; DEVIATIONS; LAYERS; NANOPARTICLES; DESORPTION; DYNAMICS; SILICON;

D O I：

10.1103/PhysRevLett.109.265501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the chain conformations of polymer molecules accommodated at the solid-polymer melt interfaces in equilibrium. Polystyrene "Guiselin" brushes (adsorbed layers) with different molecular weights were prepared on Si substrates and characterized by using x-ray and neutron reflectivity. The results are intriguing to show that the adsorbed layers are composed of the two different nanoarchitectures: flattened chains that constitute the inner higher density region of the adsorbed layers and loosely adsorbed polymer chains that form the outer bulklike density region. In addition, we found that the lone flattened chains, which are uncovered by the additional prolonged solvent leaching (similar to 120 days), are reversibly densified with increasing temperature up to 150 degrees C. By generalizing the chain conformations of bulks, we postulate that the change in probabilities of the local chain conformations (i.e., trans and gauche states) of polymer molecules is the origin of this densification process. DOI: 10.1103/PhysRevLett.109.265501

引用

页数：5

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