Density perturbations in polymers near a solid substrate: An X-ray reflectivity study

被引：54

作者：

Bollinne, C ^{[1
]}

Stone, VW ^{[1
]}

Carlier, V ^{[1
]}

Jonas, AM ^{[1
]}

机构：

[1] Univ Catholique Louvain, Lab Phys & Chim Hauts Polymeres, B-1348 Louvain, Belgium

来源：

MACROMOLECULES | 1999年 / 32卷 / 14期

关键词：

D O I：

10.1021/ma990363n

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

We have studied by X-ray reflectometry the variation of electron density of thin polymer films near solid substrates. For most polymers studied, which interact only mildly with the selected substrate (SiO2), a decrease of density was detected over a region spanning two to three statistical segment lengths at the solid interface. For poly(4-vinylpyridine) (P4VP), however, an increase of density was observed. This is related to the existence of strong adsorption interactions between P4VP and SiO2. These observations are in good agreement with theoretical predictions and may play a role in explaining the variation of the glass transition of thin supported polymer films as compared to bulk glass transitions.

引用

页码：4719 / 4724

页数：6

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