1992 Volume 65 Issue 4 Pages 1144-1145
The magnetic properties of pyro-carbons prepared from poly(vinyl chloride) and activated carbon were examined. In contrast with the observation of a hysteresis from vibrating sample magnetometer measurement, the ESR spectra showed only an usual Δms = ±1 signal. The temperature dependence of the magnetic susceptibility approximately obeys Curie’s law: The estimated spin density is ca. 1019 spins/g, roughly close to that calculated from ESR method. Therefore, it seems likely that the bulk magnetic nature of PVC/C sample is still paramagnetic, although there is a possibility that local microregions having anomalous high spin character could be formed in the sample.
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