A.c.conduction mechanisms in poly(1-ethynylnaphtalene)

Summary The a.c.conduction mechanism in poly(1-ethynylnaphtalene) with various physical and isomeric (cis-cisoidal and trans-cisoidal) structures was investigated over the frequency and temperature ranges of 10–10⁵Hz and 190–373°K respectively.The conduction mechanism depends on the isomeric structure of the polymer,and for the cis-cisoidal polymer supplementary on temperature and frequency.Over the whole frequency range(at 190°K) and above a critical frequency (at higher temperatures),which is temperature dependent,the quantum hopping mechanism is involved in cis-cisoidal polymer.Outside of this range the conduction process takes place by two parallel mechanisms: band and hopping mechanisms.In trans-cisoidal polymer the quantum hopping mechanism is involved over the whole frequency and temperature range considered.