MOLECULAR-STRUCTURE AND ELECTRICAL-TRANSPORT PROPERTIES IN NEW PYROPOLYMERS - POLYCHLOROACRYLONITRILE AND POLYCARBODIIMIDE

New pyropolymers of the form of a tough film with a good electrical co nductivity have been developed by carbonization of poly(alpha-chloroac rylonitrile) and polycarbodiimide. To elucidate the electrical conduct ion mechanism in conjunction with a formation of conjugated structure upon carbonization, we have made measurements of proton NMR relaxation rate (T1(-1)) as a function of the NMR frequency between 4-300 MHz as well as the conventional and the VSC (voltage-shorted-compaction) con ductivity measurement between 1-300 K. Changes in molecular structure from ld to 2d and from 2d to 3d by proceeding the carbonization were d emonstrated through the changes in the frequency dependence of T1(-1). Temperature dependence of the electrical conductivity is as a whole o f semiconductor type and yet a metallic temperature dependence was obt ained by the VSC measurement, showing the existence of metal-like regi ons.