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Electrical behaviour, aging and reliability of insulating materials and systems

Keywords: polymeric insulating materials and systems, nanocomposites, aging, dielectric losses
Fig. 1. Laboratory of electrical measurements. (Picture by Andrea Saccani)
Fig. 2. Cell for accelerated aging. (Picture by Andrea Saccani).

The investigation of the electrical properties studies allow to make correlations with the physical, mechanical, structural and microstructural characteristics of materials.

In the laboratory, the electrical bulk and surface conductivity are investigated in the temperature range from -80 to 250 °C, as well as the permittivity and the loss factor from10-2 to 106 Hz.

Main research topics are insulating materials and polymeric systems, including nanocomposites.

The more relevant aims are:

  1. the investigation of the aging mechanisms of insulating materials and the evaluation of the time behaviour and reliability through accelerated test methods that simulate the on-service conditions;
  2. the investigation of the conduction mechanisms and of the dielectric relaxation processes in the bulk and at the interfaces.
  3. the deposition of organic-inorganic coatings with peculiar properties (antistatic, charge injection barrier).
  4. Investigation of the failure causes of materials and systems the electric and electronic industry.

Some of the indicated activities are carried out in collaboration with research groups of the University in particular with the Department of Electrical Engineering “G. Marconi” of the University of Bologna.

Main publications

Saccani, M. Toselli 2016 “Enhancing the thermooxidative stability of PLA through the use of hybrid organic-inorganic coatings Journal of Applied Polymer Science 133, 43897.

P. Mancinelli, V. Santangelo, D. Fabiani, A. Saccani, M. Toselli, M. Fréchette 2016 “LDPE Building Blocks with Controlled Graphene-oxide Interfaces Composite Manufacturing and Electric Property Investigation” IEEJ Transactions on Fundamentals and Materials 13(2), 93-98

M. Toselli, D. Fabiani, P. Mancinelli, M. Fréchette, T. Heid, E. David, A. Saccani 2015 “In situ thermal reduction of graphene oxide forming epoxy nanocomposites and their dielectric properties” Polymer Composites 36(2), 294-301.

Mancinelli P., Fabiani D., Saccani A., Toselli M., Heid T. and Frechette M. 2013. Preparation and dielectrical behaviour of epoxy resin containing graphene oxide. Proceedings of the IEEE-ICSD June 2013, Bologna, 30 June 2013.

Saccani A., Toselli M. and Pilati F. 2011. Improvement of the thermo-oxidative stability of LDPE films by organic-inorganic hybrid coatings. Polymer Degradation and Stability. 96, 212- 219.

Fabiani D., Montanari G.C., Cavallini A., Saccani A. and Toselli M. 2011. Nanostructured-coated XLPE showing improved electrical properties: partial discharge resistance and space charge accumu- lation Proceedings of ISEIM, September 2011, Kyoto, Japan, paper A5, 14-18.

Marini M., Pilati F., Saccani A. and. Toselli M. 2008. Thermo-oxidative stability of electrically insulating polymeric materials coated by organicinorganic hybrid nanocomposite. Polymer Degradation and Stability 93, 1170-1175.

Saccani A., Patuelli F., Motori A. and Montanari G.C. 2007. Electrical conductivity and polarization processes in nanocomposites based on isotactic poly(propylene) and modified synthetic clay. Journal of Polymer Science: part B Polymer Physics 45, 705-713.

Montanari G.C., Fabiani D., Ciani F., Motori A., Paajanen M., Gerhard-Mulhaupt R and Wagener W. 2007. Charging Properties and timetemperature stability of innovative polymeric cellular ferroelectrets. IEEE Trans. on Dielectr. and Electr. Insul. 14, No. 1, 238-248.

Motori A., Saccani A., Patuelli F. and Montanari G.C. 2007. Thermal endurance evaluation of isotactic poly(propylene) based nanocomposites by short-term analytical methods. IEEE: Trans. Diel. Electr. Ins. 14, No. 3, 689-695.

Saccani A, Toselli M., Messori M., Fabbri P. and Pilati F. 2006. Electrical behavior of PET films coated with Nanostructured Organic-Inorganic Hybrids. Journal of Applied Polymer Science 102, No.5, 4870 – 4877.

Montanari GC., Palmieri F., Testa L., Motori A., Saccani A. and Patuelli F. 2006. Polarization processes of nanocomposite silicate-EVA and PP materials. IEEE Trans FM 126, No. 11, 1–7.

Montanari G.C., Motori A., Saccani A., Lorenzo del Casale M., Schifani R., Testa L., Guastavino F. and Camino G. 2005. Dielectric spectroscopy analysis of EVA-silicate nanocomposite insulating materials. Proc.of the IEEE-IEEJ ISEIM, Kytakyu- shu, Japan, June 5-9th 2005, 247 - 250

Saccani A., Motori A. and Montanari G.C. 2005. Short-term thermal endurance evaluation of thermoplastic polyesters by isothermal and nonisothermal thermogravimetric analysis. Journal of Applied Polymer Science 98, No. 3, 968-973.

Saccani A., Motori A., Patuelli F., Montanari G.C. and Mulhaupt R. 2005. Improving thermal endurance properties of polypropylene by nanostructuration. IEEE Int. Conference on Conduction and Breakdown in Solid Dielectrics, Nashville, October 16-19th 2005, Paper 2C-13, 195- 198.