Moisture absorption and absorption kinetics in polyelectrolyte films: Influence of film thickness

被引：130

作者：

Vogt, BD ^{[1
]}

Soles, CL ^{[1
]}

Lee, HJ ^{[1
]}

Lin, EK ^{[1
]}

Wu, WL ^{[1
]}

机构：

[1] NIST, Div Polymers, Gaithersburg, MD 20899 USA

来源：

LANGMUIR | 2004年 / 20卷 / 04期

关键词：

D O I：

10.1021/la035239i

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Specular X-ray reflectivity (XR) and quartz crystal microbalance (QCM) measurements were used to determine the absorption of water into thin poly(4-ammonium styrenesulfonic acid) films from saturated vapor at 25degreesC. The effect of film thickness on the absorption kinetics and overall absorption was investigated in the range of thickness from (3 to 200) nm. The equilibrium swelling of all the films irrespective of film thickness was (0.57 +/- 0.03) volume fraction. Although the equilibrium absorption is independent of thickness, the absorption rate substantially decreases for film thickness < 100 nm. For the thinnest film (3 nm), there is a 5 orders of magnitude decrease in the diffusion coefficient for water.

引用

页码：1453 / 1458

页数：6

共 57 条

[1] The gel that memorizes phases [J].