ANISOTROPY STUDY OF ELECTRICAL-CONDUCTION IN ORIENTED POLYMERS .2. ANISOTROPY OF ELECTRICAL-CONDUCTION IN UNIAXIALLY ORIENTED POLYMERS

Conductivity σ (γ) in uniaxially oriented polymers is presented as a function of the angle γ between the orientation axis and electric field, resulting in the form σ (γ) ∝1+h cos2γ, where h is given as a function of both orientation and conductivity of the polymer crystallite. The anisotropy of conductivity is obtained in uniaxially oriented samples of poly-γ-methyl-L-glutamate (PMG) and of Nylon 12 (N12). Conductivity is largest parallel to the orientation axis in PMG and is largest perpendicular to the orientation axis in N12. These correspond to the direction of the hydrogen bonding orientation. This is very obvious evidence that charge carriers flow along a direction parallel to hydrogen bonding. Anisotropy of conductivity in crystallite is estimated using an orientation parameter and anisotropy of the observed conductivity.