Investigations on some selected conducting polymers and polymer ...

Chapter-L
Hsu etal [54] have discovered that adding certain amines to the
polymer solution prevents gelation. They have found out that PAN III ,
4-diaminocyc1ohexane is a stable spin dope and good quality fibers can
be extruded by continuous dry jet spinning. The thus formed fiber
could then be drawn at 215°C.
The spin dope for these films is prepared by adding gaseous
ammonia or pyrrolidinone to the NMP solutions of PANI (EB) in
required concentrations. The fibers prepared from derivatized PANI
and poly (o-toluidine) show much higher electrical conductivity and
weaker temperature dependence than similiarly prepared HCI doped
PANI powders and films.
1.8 Advances in solution processing of PAN I
Some research groups have successfully developed a technique to
process PANI in its conducting form [28,54,59-60].This method
removes subsequent doping steps, thus reducing cost and speeding
production. Work along these lines has resulted in counterion
processible PANI and other conductive fiber and film processing
methods [54,59].Efforts to improve the mechanical properties of
PANI(EB) by elucidating the structure of the polymer m
thermodynamically stable solvents are also in progress. To achieve
good solubility, polymer-solvent interactions have to be increased as
compared to polymer-polymer interactions. If the polymer is relaxed in
solution, the probability of chain entanglement for the purpose of
developing fiber and film strength, on extrusion is enhanced. This
entanglement should remain after doping to produce conductive fiber or