TWO-LAYER MODEL DESCRIPTION OF POLYMER THIN FILM DYNAMICS

Experiments in the past two decades have shown that the glass transition temperature of polymer films can become noticeably different from that of the bulk when the film thickness is decreased below ca. 100 nm. It is broadly believed that these observations are caused by a nanometer interfacial laye...

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Bibliographic Details
Published inChinese journal of polymer science Vol. 31; no. 1; pp. 12 - 20
Main Authors Peng, Dong-dong, Li, Ran-xing Nancy, Lam, Chi-hang, Tsui, Ophelia K. C.
Format Journal Article
LanguageEnglish
Published Heidelberg Chinese Chemical Society and Institute of Chemistry, CAS 2013
Subjects
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Industrial Chemistry/Chemical Engineering
Polymer Sciences
动力学模型
模型假设
液力偶合器
玻璃化转变温度
聚合物膜
聚甲基丙烯酸甲酯
薄膜厚度
高分子薄膜
Glass transition
Viscosity
Polymer films
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Summary:Experiments in the past two decades have shown that the glass transition temperature of polymer films can become noticeably different from that of the bulk when the film thickness is decreased below ca. 100 nm. It is broadly believed that these observations are caused by a nanometer interfacial layer with dynamics faster or slower than that of the bulk. In this paper, we examine how this idea may be realized by using a two-layer model assuming a hydrodynamic coupling between the interfacial layer and the remaining, bulk-like layer in the film. Illustrative examples will be given showing how the two-layer model is applied to the viscosity measurements of polystyrene and polymethylmethacrylate films supported by silicon oxide, where divergent thickness dependences are observed.
Bibliography:Polymer films; Glass transition; Viscosity.
Experiments in the past two decades have shown that the glass transition temperature of polymer films can become noticeably different from that of the bulk when the film thickness is decreased below ca. 100 nm. It is broadly believed that these observations are caused by a nanometer interfacial layer with dynamics faster or slower than that of the bulk. In this paper, we examine how this idea may be realized by using a two-layer model assuming a hydrodynamic coupling between the interfacial layer and the remaining, bulk-like layer in the film. Illustrative examples will be given showing how the two-layer model is applied to the viscosity measurements of polystyrene and polymethylmethacrylate films supported by silicon oxide, where divergent thickness dependences are observed.
11-2015/O6
ISSN:0256-7679
1439-6203
DOI:10.1007/s10118-013-1207-x