Preparation of Poly (phenylene biguanide hydrochloride) by Polyaddition of Aminophenyldicyandiamide

Abstract

p-and m-Aminophenyldicyandiamides were prepared by the reduction of p- and m-nitrophenyldicy-andiamides using zinc powder and sodium chloride in water. p-and m-Aminophenyldicyandiamide hydrochlorides (p-and m-APDDHCl) were found from DSC measurement to change into poly (p- and m-phenylene biguanide hydrochloride) s by polyaddition reaction at 190-220°C for p-APDDHCl and at 150-180°C for m-APDDHCl. The poly (phenylene biguanide hydrochloride) s were also obtained by heating APDDHCI at 180°C or 200°C. The reduced viscosities of these polymers were 0.15-0.16 in dimethyl sulfoxide. Thermal properties of the polymers were examined.