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Dielectric relaxations of shellac/amino resin blends
Author(s) -
Lakshminarayanan T. R.,
Gupta M. P.
Publication year - 1974
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1974.070180713
Subject(s) - shellac , dielectric , glass transition , materials science , dielectric loss , melamine , melamine resin , composite material , polymer chemistry , polymer , coating , optoelectronics
The dielectric constant (ε′) and loss (ε″) of shellac/melamine resin blends have been determined at temperatures between 20° and 120°C and frequencies between 0.1 and 100 kHz. ε′ decreases with increase in the percentage of melamine resin in the blend. Two relaxations have been observed, of Δ H = 4.99 kcal/mole and 11.1 kcal/mole. The glass transition is observed between 60° and 70°C. The cole‐cole parameter increases with temperature and becomes constant above T g .