Characterisation of water-based coatings by electrochemical impedance spectroscopy

被引：34
|
作者：
Le Pen, C
Lacabanne, C
Pébère, N
机构：
[1] ENSIACET, CNRS, UMR 5085, Lab Interfaces & Mat,CIRIMAT, F-31077 Toulouse 04, France
[2] Univ Toulouse 3, CIRIMAT, CNRS, UMR 5085,Lab Phys Polymeres, F-31062 Toulouse, France
来源：
PROGRESS IN ORGANIC COATINGS | 2003年 / 46卷 / 02期
关键词：
electrochemical impedance spectroscopy; water-based coatings; glass transition temperature; capacitance variation;
D O I：
10.1016/S0300-9440(02)00213-8
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Electrochemical impedance spectroscopy was used to investigate the behaviour of an epoxy water-based coating immersed in a solution of sodium chloride. The increase of the resistance, associated to the high-frequency part of the diagram (R-HF), with increasing immersion time was attributed to the occurrence of coalescence of the polymer particles in water-based film, accelerated by immersion in the electrolytic solution. It was shown that the capacitance (C-HF) variation with immersion time results from a plasticisation effect induced by water uptake and from the coalescence process. In addition, dielectric measurements revealed that the water molecules are bound with the polar groups of the polymer. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：77 / 83
页数：7
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