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Degradation profiles of polyester-urethane (HP-MDI) and polyester-melamine (HP-HMMM) coatings: A thermal study

Authors

  • Ramanuj Narayan,

    1. Organic Coatings and Polymer Division, Indian Institute of Chemical Technology, Hyderabad 500 007, India
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  • D. K. Chattopadhyay,

    1. Organic Coatings and Polymer Division, Indian Institute of Chemical Technology, Hyderabad 500 007, India
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  • B. Sreedhar,

    1. Inorganic and Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad 500 007, India
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  • K. V. S. N. Raju,

    Corresponding author
    1. Organic Coatings and Polymer Division, Indian Institute of Chemical Technology, Hyderabad 500 007, India
    • Organic Coatings and Polymer Division, Indian Institute of Chemical Technology, Hyderabad 500 007, India
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  • N. N. Mallikarjuna,

    1. Center of Excellence in Polymer Science, Karnatak University, Dharwad 580 003, India
    Current affiliation:
    1. Department of Chemistry, Alan G. MacDiarmid Laboratories for Technical Innovation, The University of Texas at Dallas, Richardson, TX 75080
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  • T. M. Aminabhavi

    Corresponding author
    1. Center of Excellence in Polymer Science, Karnatak University, Dharwad 580 003, India
    • Center of Excellence in Polymer Science, Karnatak University, Dharwad 580 003, India
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  • This paper is CEPS communication # 54.

Abstract

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

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