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  • 1 Voith Hydro Ltda., São Paulo, Brazil
  • | 2 Universidade de São Paulo, São Paulo, Brazil
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Abstract

Cure kinetics study of epoxy resin composite, employed as stator bars insulation system, was evaluated through differential scanning calorimetry using the dynamic methodology, different heating rates. These experiments provided some important information about the system as activation energy (Ea = 65.4 kJ mol−1), glass transition (Tg) values on different curing stages including the final cured material information and, besides that, it enables the comparison of these data with new materials under development. The activation energy value allows the determination of different energy needs of the system under evaluation, specially temperature for the material cure, improving the possibility of comparison between different insulation systems in use in the high voltage insulation business. The composite conversion degree based on the cure enthalpy (ΔHcure) at different time of cure was also subject of analysis and from that it was possible to comprehend the cure pattern which allows the cure state prediction of further samples of this type of material and the more accurate evaluation of similar samples acquired directly from stator bars.

  • 1. Ghaemy, M, Riahy, MH. Kinetics of anhydride and polyamide curing of bisphenol A-based diglycidyl ether using DSC. Eur Polym J. 1996;32:12071212. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 2. Morgan, RJ, Shin, EE, Rosenberg, B, Jurek, A. Characterization of the cure reactions of bismaleimide composite matrices. Polymer. 1997;38:639646. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 3. Lange, J, Altmann, N, Kelly, CT, Halley, PJ. Understanding vitrification during cure of epoxy resins using dynamic scanning calorimetry and rheological techniques. Polymer. 2000;41:59495955. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 4. Cook, WD, Simon, GP, Burchill, PJ, Lau, M, Fitch, TJ. Curing kinetics and thermal properties of vinyl ester resins. J Appl Polym Sci. 1997;64:769781. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 5. Fish, W, Hofmann, W. Chemischer aufbau von gehärteten epoxyharze. III. Mitteilung über chemie der epoxyharze. Makromol Chem. 1961;44:823. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 6. Steinmann, B. Investigations on the curing of epoxy resins with hexahydrophthalic anhydride. J Appl Polym Sci. 1989;37:17531776. .

  • 7. Stevens, GC. Cure kinetics of a low epoxide/hydroxyl group-ratio bisphenol a epoxy resin-anhydride system by infrared absorption spectroscopy. J Appl Polym Sci. 1981;26:42594278. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 8. Matejka, L, Lovy, J, Pokorny, S, Bouchal, K, Dusek, K. Curing epoxy resins with anhydrides. Model reactions and reaction mechanism. J Polym Sci Polym Chem. 1983;21:28732885.

    • Search Google Scholar
    • Export Citation
  • 9. Tanaka, V, Kakiuchi, H. Study of epoxy compounds. Part VI. Curing reactions of epoxy resin and acid anhydride with amine, acid, alcohol, and phenol as catalysts. J Polym Sci Part A. 1964;2:34053430.

    • Search Google Scholar
    • Export Citation
  • 10. Mark, HF. Encyclopedia of Polymer Science and Technology, vol. 9. 3 New York: Wiley; 2004 755758.

  • 11. Heba-Laref, F, Mouzali, M, Abadie, MJM. Effect of the crosslinking degree on curing kinetics of an epoxy-anhydride styrene copolymer system. J Appl Polym Sci. 1999;73:20892094. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 12. Kissinger, HE. Reaction kinetics in differential thermal analysis. Anal Chem. 1957;29:17021706. .

  • 13. Lee, IY, Choi, HK, Shim, MJ, Kim, SW. Cure and thermal degradation kinetics of DGEBA/MDA/PGE-AcAm/CTBN system by Kissinger equation. J Ind Eng Chem. 1998;4:711.

    • Search Google Scholar
    • Export Citation
  • 14. Patel, SP, Patel, RG, Patel, VS. Curing kinetics of epoxy-anhydride systems using quaternary ammonium guar and hydroxyethyl guar as catalysts. Br Polym J. 1988;20:4347. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 15. Montserrat, S, Flaqué, C, Pagès, P, Málek, J. Effect of the crosslinking degree on curing kinetics of an epoxy-anhydride system. J Appl Polym Sci. 2003;56:14131421. .

    • Crossref
    • Search Google Scholar
    • Export Citation

Manuscript Submission: HERE

  • Impact Factor (2019): 2.731
  • Scimago Journal Rank (2019): 0.415
  • SJR Hirsch-Index (2019): 87
  • SJR Quartile Score (2019): Q3 Condensed Matter Physics
  • SJR Quartile Score (2019): Q3 Physical and Theoretical Chemistry
  • Impact Factor (2018): 2.471
  • Scimago Journal Rank (2018): 0.634
  • SJR Hirsch-Index (2018): 78
  • SJR Quartile Score (2018): Q2 Condensed Matter Physics
  • SJR Quartile Score (2018): Q2 Physical and Theoretical Chemistry

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
4
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)