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High Temperature Electrical Conductivity Of Solution-Cast Bbl Flims.
Published 1993 · Materials Science
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Thin films (18 μ thickness) of ladder polymer poly[(7-oxo-7H,10H-benz (d,e) imidazo (4′,5′:5,6) -benzimidazo (2,l-a) isoquinoline-3,4:10,ll-tetrayl)-10-carbonyl} (BBL), which were cast from an isotropie methanesulfonic acid solution of BBL, were characterized for electrical conductivity in the temperature range of 25–480 °C. The electrical conductivity was Measured in situ while the films were heated at a rate of 2 °C/Minute under vacuum. The in-plane conductivity of BBL films increased rapidly from below 10 −10 S/cm at the room temperature to 5 × 10 -3 S/cm at 280 °C and then increased slowly to a peak value of 5 × 10 -2 S/cm at about 460 °C. The out-of-plane conductivity of the films was comparable to their in plane conductivity at temperatures below 270 °C, however, was lower by a factor of 10 than in-plane conductivity at temperatures above 270 °C. This anisotropy in conductivity of BBL films is discussed with respect to the film morphology determined by wide angle x-ray scattering studies.