Abstract 2,5‐Dichlorothiophene, 2,5‐dibromothiophene, and tetrabromothiophene have been polymerized with anhydrous sodium sulfide in N‐methylpyrrolidone (NMP) at 250°C to insoluble products which contain structural fragments derived from both the starting thiophene and the NMP. The copolymers absorb 0.5 to 1.0 times their weights of iodine to give materials with electrical conductivities of about 10‐5 (ohm cm)‐1 at 16 kbar and 10‐7 (ohm cm)‐1 at atmospheric pressure.
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Gutierrez et al. (1984) studied this question.
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