Title
Micro-thermal analysis of polyester coatings
Author
Fischer, H.R.
TNO Industrie en Techniek
Publication year
2010
Abstract
The application and suitability of micro-thermal analysis to detect changes in the chemical and physical properties of coating due to ageing and especially photo-degradation is demonstrated using a model polyester coating based on neopentyl glycol isophthalic acid. The changes in chemical structure like chain scission and cross-linking are manifested by a shift of the LTA detectable Tg and by a change of the slope of the part of the LTA graph responsible for the penetration of the hot sensor into the material after passing the glass transition temperature. As such LTA is a valuable tool to have a quick look into coating surfaces and especially their ageing. The photo-degradation of polyester in air leads to the formation of a cross-linked network at a surface layer of about 3-4 μm coupled with an increase in hardness and of the glass transition temperature by ∼90 K, the effect is less drastic for a photo-degradation in a nitrogen environment. Moreover, the presence of a non-equilibrium dense surface layer with a higher Tg formed during the drying of the coating formulation and the film solidification can be shown. © 2010 Elsevier B.V. All rights reserved.
Subject
Mechatronics, Mechanics & Materials
MIP - Materials for Integrated Products
TS - Technical Sciences
Materials
Industrial Innovation
Coatings
Photo-degradation
Surface analysis
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TNO identifier
346401
Publisher
Elsevier
ISSN
0169-4332
Source
Applied Surface Science, 256 (12), 3714-3717
Document type
article