Anomalous behavior of electrical conductivity and thermal noise in carbon black-containing polymers at Tg and Tm

✍ Scribed by Carl Klason; Josef Kubát

• Publisher: John Wiley and Sons
• Year: 1975
• Tongue: English
• Weight: 839 KB
• Volume: 19
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1975.070190319

✦ Synopsis

Pronounced maxima in resistivity-temperature curves have been found at or above T, for a number of amorphous polymers (PS, PMMA, PVC) containing a small percentage of carbon black. The maxima appeared only after a certain period of storage at T < To or at heating rates substantially higher than those used in coding the samples prior to the measurement. For this reason, no maxima were observed during cooling. In crystalline polymers (PE, PP), maxima at T, appeared both on heating and cooling. Marked relaxaticn effects (time-dependent resistivity) were recorded in the To and T, regions. Good agreement was found between resistivity and thermal noise data.