Journal of Thermal Analysis and Calorimetry

, Volume 134, Issue 3, pp 2017–2027 | Cite as

Alkyd hybrid coatings for electrical rotating machines

  • Alina Ruxandra Caramitu
  • Marius Bumbac
  • Cristina Mihaela Nicolescu
  • Traian Zaharescu


Alkyd hybrid systems containing antioxidants (IRGANOX 1010, IRGANOX 1076, and SANTONOX R), titania and alumina were subjected to thermal and radiation degradation for their application in the electrical engineering. For the characterization of thermal stability of hybrid compositions, crystallinity evolution in nanostructured organic polymers, and structure changes, due to different thermal treatment isothermal and nonisothermal chemiluminescence, X-ray diffraction, infrared absorption spectroscopy with Fourier transforming infrared spectrometer and Raman spectroscopy were, respectively, used. It was found that the oxidation protector IRGANOX 1010 and TiO2 filler increased the thermal stability proved by chemiluminescence. The long-term heating characterized by temperature index demonstrated that the modified alkyd–melamine–epoxy resin is a suitable treatment for polyester laminates used in the electrical rotating machines. The superior thermal performances of cured polyester laminates were also demonstrated by the evaluation of swelling degree that is placed at half or lower values in modified materials than in neat resin. The interaction between formulation components is revealed by the improvement of thermal strength whose level is increased due to the cage effects promoted by additive and filler.


Alkyd resin Hybrid compositions Stabilization Thermal degradation Radiation accelerated ageing 



This study was accomplished in the frame of research and development project PN-II-PT-PCCA-2013-4-0792 “High performance polymeric insulations for electrical rotation machines. Technology and modeling approaches (IsMach)” funded by the Ministry of Education, Research and Sport.


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.National Institute for Electrical Engineering (INCDIE – ICPE CA)BucharestRomania
  2. 2.Valahia University of TargovisteTargovisteRomania

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