Investigations on some selected conducting polymers and polymer ...

Chapter-L
Generally there are four different methods for copolymerization [9].
a) Insitu polymerization of both monomers to form a random
copolymer
b) Grafting of the solubilizing polymer onto the backbone of the
insoluble polymer
c) Grafting of the insoluble polymer onto the backbone of the
soluble polymer
d) Combination ofboth soluble and insoluble polymers to form a
block copolymer by various synthetic methods
e) Insitu polymerization of an insoluble polymer onto the matrix
ofa soluble polymer.
Examples include composites of polyaniline and polypyrrole
formed by in situ polymerization in matrices such as poly
(vinyl chloride) (PVC), polyvinyla1cohol (PVA), poly
(vinylidinechloride-co-trifluoroethylene) and brominated
poly (vinyl carbazole) [37,50].
f) Counterion-induced processibilityofconducting polyaniline (PANI)
Cao etal [28] have reported that the processibilty of highly
conducting PANI with reasonably high molecular weight
could be improved by using functionalized protonic acids.
The functionalized protonic acid has the form H+(M-R).(M-R)
is the counterion anionic species. R is the functional group
chosen to be soluble in nonpolar or weakly polar organic
solvents. Dodecyl benzene sulfonic acid (DBSA) and