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Self-temperature-control heaters by graphite-poly(ethylene glycol) mixed systems: mechanism of electrical conduction

1988; Elsevier BV; Volume: 29; Issue: 3 Linguagem: Inglês

10.1016/0032-3861(88)90373-4

1873-2291

Toyoaki Kimura, Shigeyuki Yasuda,

Conducting polymers and applications

We have found that graphite-poly(ethylene glycol) mixed systems constitute self-temperature-control heaters and that the self-controlled constant temperatures depend on the molecular weight of the poly(ethylene glycol). The mechanism of self-temperature-control for these systems cannot be explained in terms of volume expansion of the total system, which has hitherto been suggested for the self-temperature-control mechanism for systems such as carbon-rubber mixtures. It is found that the temperature dependence of the electrical resistance in a graphite-poly(ethylene glycol) system corresponds well to that of the dielectric constant in the corresponding pure poly(ethylene glycol) system. This leads to a model by which the mechanism of electrical conduction and self-temperature-control can be explained. The voltage dependence of the electric currents in graphite-poly(ethylene glycol) systems supports this model.