Radiation‐induced conductivity in polystyrene as a hopping phenomenon

Tyutnev, A. P.; Saenko, V. S.; Dubenskov, P. I.; Ванников, А. В.

doi:10.1002/actp.1986.010370114

Cited by 4 publications

(1 citation statement)

References 30 publications

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“…Even in polystyrene (PS) with rather high IP of transport moiety (that of styrene molecule is 8.2 eV) RIC of various commercial films is rather close (K rd 1 6 10 213 F m 21 Gy 21 at 5 6 10 7 V m 21 at room temperature). Low ionization molecules easily affect its RIC reducing 2 from its original value 0.2 to 0 [31] in full accordance with the theory [23].…”

Section: Discussionsupporting

confidence: 78%

Charge Carrier Transport in a Molecularly Doped Polymer: Dispersive versus Gaussian

Tyutnev¹,

Saenko²,

Pozhidaev

et al. 2005

High Performance Polymers

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A typical molecularly doped polymer (bisphenol- A-polycarbonate containing 30 mass% of hydrazone DEH) has been put to thorough experimental examination by both time of flight and radiationinduced conductivity methods. A much improved measurement technique incorporating a computerassisted registration scheme that allows one to record a complete current transient over up to five decades in time in one single shot was employed. Studies of radiation-induced conductivity (conductivity proper as well as transit effects) uniquely prove the dispersive rather than the Gaussian transport of holes (majority carriers) in this polymer. The shape of the time-of flight current transients is strongly influenced by some extraneous factor, presumably surface traps, whose role in radiation-induced conductivity could hardly be detected. We describe the phenomenon quantitatively using a multiple trapping formalism. A critical discussion of the present situation in the field of charge carrier transport in disordered solids is also included.

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Section: Discussionsupporting

confidence: 78%

Charge Carrier Transport in a Molecularly Doped Polymer: Dispersive versus Gaussian

Tyutnev¹,

Saenko²,

Pozhidaev

et al. 2005

High Performance Polymers

View full text Add to dashboard Cite

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Chemical aspects of the radiation‐induced conductivity in polymers

1996

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It has been demonstrated that radiation-induced conductivity (RIC) is strongly dependent on the chemical structure ofthe macromolecules, this dependence being influenced by the position of the active molecular group acting as a hopping center for charge carriers: main chain vs pendant case. Both RIC magnitude and its nature (free ion vs geminate) are affected. Annealing of the radiation-induced conductivity (RIC) in four common polymers (PS, PET, LDPE and PTFE) continuously irradiated in vacuum to doses of about 5 x 10' Gy has been studied. While substantial recovery (up to 75%) has been observed in PS and PET, only steady degradation of RIC has been encountered in LDPE and especially in PTFE (annealing at elevated temperatures has been fulfilled only in air). Unlike other polymers tested, PS shows recovery that depends critically on the surrounding atmosphere (air or vacuum).To describe these results one relies heavily on the radiation-induced oxidation as a chain radical process with degenerate branching (a case of LDPE and PTFE) and catalytic recombination of macroradicals (as in PS).

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