Polyheterocyclics have been the subject of intense recent research interest.1 Registry No. PP, 30604-81-0; PMT, 84928-92-7.(5) Conductivity values for homogeneous PP films were obtained by using this method and the more conventional four-point method; identical values were obtained. The four-point method cannot be used on these ultranarrow fibers.(6) The surface layers are less than 200 nm thick and cover 100% of the surface area; the fibers are 10 ^m long and occupy 1% (or less) of the surface area.Furthermore, for several membranes, we measured the resistance, scraped off the surface layers, and then remeasured the resistance; Rm values with and without the surface layers were identical.

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