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Electrical properties of an insulating varnish
Author(s) -
Bishai Augenie M.,
Hakim Itedal K.
Publication year - 1995
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1995.210360403
Subject(s) - varnish , castor oil , materials science , composite material , styrene , dielectric , electrical resistivity and conductivity , melamine , melamine resin , volume (thermodynamics) , monomer , polymer chemistry , chemistry , organic chemistry , polymer , copolymer , physics , coating , optoelectronics , quantum mechanics , electrical engineering , engineering
A systematic dielectric study was carried out over a frequency range 60 Hz–300 kHz and at temperatures between 5 and 90°C on dehydrated castor oil mixed with different concentrations of styrene monomer to produce an insulating varnish. The volume resistivity was also studied. The results show that, when dehydrated castor oil is mixed with 10% styrene content by weight of the oil, epoxidised and then chemically treated with melamine resin and other additives, a varnish is produced with favourable electrical insulation properties.