UV ageing characterisation of organic anticorrosion coatings by dynamic mechanical analysis, Vickers microhardness, and infra-red analysis

Citation
M. Irigoyen et al., UV ageing characterisation of organic anticorrosion coatings by dynamic mechanical analysis, Vickers microhardness, and infra-red analysis, POLYM DEGR, 74(1), 2001, pp. 59-67
Citations number
10
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
POLYMER DEGRADATION AND STABILITY
ISSN journal
01413910 → ACNP
Volume
74
Issue
1
Year of publication
2001
Pages
59 - 67
Database
ISI
SICI code
0141-3910(2001)74:1<59:UACOOA>2.0.ZU;2-Q
Abstract
To monitor the UV degradation of organic anticorrosion coatings, different kinds of information provided by different characterisation methods are com pared. Vickers microhardness (HV) results are correlated with T-g measureme nts, by the pin point method. This technique is investigated during UV-A ar tificial ageing taking into account the influence of coating thickness and mineral pigments. After verifying the high quality and accuracy of the Tg i nformation, the HV data are corrected, to prevent distortion of the measure ments by thickness and pigment concentration. A corrective method is discus sed and checked. The chemical degradation and mechanisms, identified by FT- IR spectroscopy, are also correlated to Tg changes. This has allowed us to validate the previous method. The main interest of this study is a correlat ion the mechanical modifications of the top-coat which are macroscopic cons equences of the UV ageing, with photochemical degradations which directly c orrespond to the molecular modifications induced by UV radiation. For that the T-g measurements are of great interest. (C) 2001 Elsevier Science Ltd. All rights reserved.