Effect of internal and external tensides on the electrical properties of polymeric surfaces
Pure and Applied Chemistry
The application of a homologous series of bis-quaternary ammonium bromides to human hair increased its electrical conductivity by about four orders of magnitude and reduced the triboelectric charge generated when the hair was combed or brushed dramatically, in most cases to zero. The conduôtivity increased as the number of poly(ethylene oxide) moieties bridging the quaternary nitrogen atoms increased and the length of the alkyl chains on the nitrogens decreased. Weatheting, bleaching and
... leaching and shampooing hair did not significantly alter its conductivity. The triboelectric charge generated on hair by brushing or combing reverses from negative to positive as the ionic state of its surface is altered by immersion in and or base solutiohs of varying pH. This observation suggests that either hydroxyl or hydrogen ions are the most mobile ions on the hair surface or that triboelectrification involves an electronic mechanism. By measuring conductivity under high electric fields, the charge transport mechanism of nylon 66, nylon 6 and poly(ethylene terephthalate) fibers was in most cases found to be space charge limited or trapped charge limited. The transport mechanism becomes ohmic, however, when as little as 5% of an, internal tenside is added to the fiber.