Authors : R. H. Guptaa, W. B. Gurnuleb* and S. S. Rahangdalec.
Page Nos : 452-459
Description :
Copolymer resins have been synthesized by reacting 2,4-dihydroxy benzoic acid
with dithiooxamide and formaldehyde in presence of 2M HCl as catalyst, proved to be
semiconducting in nature. The electrical properties of DBDF-1, DBDF-2, HDBDF-3 and
HDBDF-4 copolymer were measured over a wide range of temperature (313-423K).
From the electrical conductivity of these copolymers, activation energies of electrical
conduction have been evaluated and values lies in the range 3.76 x 10-8- 4.45 x 10-8
J/K. The plots of log vs 103/ T are found to be linear over a wide range of
temperature, which indicate that the Wilson’s exponential law = o exp (Ea/kT ) is
obeyed. On the basis of above studies these copolymers can be ranked as
semiconductors.
