Özgül Erdamar, Bogazici University
on Experimental Investigation of the Humidity Induced Change in the Conduction Mechanism of PEG

Hydrophilic polymers have been studied extensively because of their wide use in electronics, food industry, pharmaceutical technology and different kinds of sensors. These polymers attract attention because of their absorption, desorption and swelling behavior under exposure to water vapor and certain chemicals. The diffusion of the penetrants in the polymer networks shows different kinetics depending on environmental conditions such as temperature and humidity as well as the structure of the polymer and the diffusivity of the penetrant. The transport mechanism of the penetrants in the polymer and their effects should be known in detail to get the highest efficiency from the polymers.
Polyethylene glycole (PEG) is a polymer which is sensitive to some chemicals and high water vapor, and due to this property, it is often used in humidity sensor applications and in the development of biosensors because of its biocompatibility. The characterization of the electrical properties of covalently linked pure, hydrogenated and hydrophobically modified polyethylene glycol thin films under a changing relative humidity is examined by dc measurements.