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  • 1 Voith Hydro Ltda, São Paulo, Brazil
  • | 2 Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
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Abstract

The study of mica–epoxy-based composite has a great role in high voltage machines industry. Beside electric properties, this composite should present compatible mechanical and chemical, in this case thermal characteristics to insulate properly the conductor strand, avoiding short-circuits, and leading electrical current with minimal losses. Improvement of the quality is possible through the knowledge of raw materials and system. This study aims to list a complete thermal characterization of mica composite, its components, epoxy resin, anhydride methylhexahydrophtalic, mica tape and zinc naphthenate, and thermoanalytical interactions between them. These data shows intrinsic properties of the system, which is so relevant to its great electrical and thermal performance. Thermal analysis allows the detailed study of curing process and thermal decomposition, predicting and suggesting mechanisms, beside future and possible optimization to the system. Composite system glass transition (Tg) was obtained through an important and very respected methodology, presenting the value of Tg = 138 ± 2 °C, finally characterizing the material.

  • 1. Jain, R, Choudhary, V, Narula, AK. Curing and thermal behavior of DGEBA in presence of dianhydrides and aromatic diamine. J Appl Polym Sci. 2007;105:38023808.

    • Search Google Scholar
    • Export Citation
  • 2. Greg, CS, Boulter, EA. Historical development of rotor and stator winding insulation materials and systems. IEEE Electr Insul Mag. 2004;20:2539. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 3. Mertens W . Method of producing an insulating sleeve of mica tape impregnated with thermosetting epoxide impregnating resin mixture and product thereof. US 3556925, Siemens; 1971.

    • Search Google Scholar
    • Export Citation
  • 4. Chian, W, Timm, DC. Chemical/mechanical analyses of anhydride-cured thermosetting epoxys: DGEBA/NMA/BDMA. Macromolecules. 2004;37:80989109. .

  • 5. Montserrat, S, Flaqué, C, Calafell, M, Andreu, G, Málek, J. Influence of the accelerator concentration on the curing reaction of an epoxy-anhydride system. Thermochim Acta. 1995;269/270:213229. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 6. Boquillon, N, Fringant, C. Polymer networks derived from curing of epoxidised linseed oil: influence of different catalysts and anhydride hardeners. Polymer. 2000;41:86038613. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 7. Turi, EA. Thermal characterization of polymeric materials. 2 1 New York: Academic Press; 1981.

  • 8. ASTM D3418-08: Standard test method for transition temperatures and enthalpies of fusion and crystallization of polymers by differential scanning calorimetry. ASTM International. 2008. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 9. Flippen-Anderson, JL, Gilardi, R. Diglycidyl ether of bisphenol A (DGEBA). Acta Crystallogr B. 1981;37:14221435. .

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)

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