The effect of temperature on the behavior of poly( o ‐chloroaniline) salts: conductivity and spectral studies

Conducting poly(o‐chloroaniline) salis have been prepared by chemical polymerization of o‐chloroaniline with five different acids. Composition and the extent of dopant in poly(o‐chloroaniline) salt systems have been determined. Poly(o‐chloroaniline) samples have been heat treated at four different temperatures 150, 200, 275 and 375°C and characterized by electron paramagnetic, infrared and electronic absorption spectral measurements. Thermal stabilities of the chemically synthesized poly(o‐chloroaniline) salts have been studied by spectral methods. It was found that the polymer is apparently stable up to 200°C, and at around 275°C crosslinking takes place. It is inferred that the electron paramagnetic resonance signal observed in the conducting material does not arise from the current‐carrying species, but rather from neutral paramagnetic species. No definite correlation exists between conductivity and the extent of dopant or spin concentration.