Accession Number : AD0726353

Title :   Radiation-Induced Conductivity in N-Hexane, Neohexane, and Special Polystyrene Films,

Corporate Author : HARRY DIAMOND LABS WASHINGTON D C

Personal Author(s) : Boesch,Harold E. , Jr. ; Conrad,Edward E.

Report Date : MAY 1971

Pagination or Media Count : 67

Abstract : An investigation has been made of the transient electrical conductivity induced in special polystyrene films and liquid alkanes (n-hexane and neohexane) by radiation from a high-intensity flash X-ray machine. The polystyrene films were cast from solutions of polymers with a closely defined and narrow chain length distribution. Transient conductivity in the films was measured and was related to a kinetic model dominated by carrier trapping. The decay of radiation- induced conductivity in n-hexane and neohexane is described in terms of threee time domains-an early (<200 nsec) exponential decay, an intermediate (<200 micro sec) nonohmic decay, and a late hyperbolic decay. The results of the study indicated no significant variation of the prompt induced conductivity with polymer molecular weight or sample temperature over the range of l50 to 300K. The early conductivity exhibited hysteresis effects and low-field departures from ohmic behavior. The delayed conductivity decay showed a temperature dependence consistent with trap-hopping processes. In this region, samples of different molecular weight showed deviations from the hyperbolic decay mode. (Author)

Descriptors :   (*STYRENE PLASTICS, ELECTRICAL CONDUCTIVITY), (*HYDROCARBONS, ELECTRICAL CONDUCTIVITY), FILMS, ALKANES, DYNAMICS, X RAYS

Subject Categories : Physical Chemistry
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE