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Degradation profiles of polyester‐urethane (HP‐MDI) and polyester‐melamine (HP‐HMMM) coatings: A thermal study
Author(s) -
Narayan Ramanuj,
Chattopadhyay D. K.,
Sreedhar B.,
Raju K. V. S. N.,
Mallikarju. N.,
Aminabhavi T. M.
Publication year - 2005
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.21770
Subject(s) - polyester , melamine , thermogravimetry , thermal stability , materials science , degradation (telecommunications) , activation energy , chemical engineering , composite material , organic chemistry , chemistry , telecommunications , computer science , engineering
This article investigates the effect of diol structure and acetoacetylation of the hydroxylated polyesters (HPs) on thermal stability and degradation profiles of HPs/hexamethoxymethylmelamine (HMMM) as well as HPs/diphenylmethane diisocyanate (MDI) high solids coatings (HSCs) by thermogravimetry. Thermal stability of HP‐MDI and HP‐HMMM coatings constitute the main focus of this investigation. It is found that variations in the constituent groups to synthesize HPs and acetoacetylation of HPs are important to achieve superior performance. Results of this study indicated a good thermal stability of coatings. However, not much variation in thermal stability was observed with the structural variations in HPs. Mathematical equations of Broido, Coats‐Redfern, and Chang were used to evaluate the kinetic parameters. Activation energy was found to be dependent on the kinetic methods used. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 518–526, 2005