Synthesis and some properties of poly‐(2,5‐trimethylene benzimidazole) and poly‐(2,5‐trimethylene benzimidazole hydrochloride)

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Abstract
A polymer, poly(2,5‐trimethylene benzimidazole), the first of a new family of nonsymmetrical polymers, was synthesized via an eight‐step synthetic route. The polymer, obtained by melt polymerization, is amorphous and in its neutral form behaves as a moderate insulator. It forms 1 : 1 HCl adducts. When cast from formic acid solution, it forms 1 : 1 formic acid adducts. The acid adducts are semiconductors with resistivities in the 106–108 ohm‐cm range. Space‐charge effects are generated in the adducts as carrier mobility rises.

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