Thermal characterization of polyester-melamine coating matrices prepared under nonisothermal conditions

Wackwella Gamage, N., Hill, D. J. T., Lukey, C. A. and Pomery, P. (2003) Thermal characterization of polyester-melamine coating matrices prepared under nonisothermal conditions. Journal of Polymer Science: Part A Polymer Chemistry, 41 11: 1603-1621. doi:10.1002/pola.10698


Author Wackwella Gamage, N.
Hill, D. J. T.
Lukey, C. A.
Pomery, P.
Title Thermal characterization of polyester-melamine coating matrices prepared under nonisothermal conditions
Journal name Journal of Polymer Science: Part A Polymer Chemistry   Check publisher's open access policy
ISSN 0887-624X
Publication date 2003
Sub-type Article (original research)
DOI 10.1002/pola.10698
Volume 41
Issue 11
Start page 1603
End page 1621
Total pages 19
Place of publication USA
Publisher Wiley
Collection year 2003
Language eng
Subject C1
250502 Physical Chemistry of Macromolecules
780103 Chemical sciences
Abstract Thermal analysis methods (differential scanning calorimetry, thermogravimetric analysis, and dynamic mechanical thermal analysis) were used to characterize the nature of polyester-melamine coating matrices prepared under nonisothermal, high-temperature, rapid-cure conditions. The results were interpreted in terms of the formation of two interpenetrating networks with different glass-transition temperatures (a cocondensed polyester-melamine network and a self-condensed melamine-melamine network), a phenomenon not generally seen in chemically similar, isothermally cured matrices. The self-condensed network manifested at high melamine levels, but the relative concentrations of the two networks were critically dependent on the cure conditions. The optimal cure (defined in terms of the attainment of a peak metal temperature) was achieved at different oven temperatures and different oven dwell times, and so the actual energy absorbed varied over a wide range. Careful control of the energy absorption, by the selection of appropriate cure conditions, controlled the relative concentrations of the two networks and, therefore, the flexibility and hardness of the resultant coatings. (C) 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Cbem 41: 1603-1621, 2003.
Keyword Polyesters
Crosslinking
Coatings
Thermal Properties
Networks
Cross-linking
Polymerization
Degradation
Conversion
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 01:56:04 EST