Applications, photoconductors characteristic

A unique characteristic of polymers composed of extended chains of Group 14 elements is the delocalization of electrons through the cr-bond framework of the polymer backbone.7 These polymers are known to absorb in the ultraviolet, with absorption maxima dependent both on main chain substituents and on chain length. Several potential applications exist, such as photoconductors, photoresists in microelectronics, photoinitiators for radical reactions, and precursors to ceramic materials. 

Besides the electroactive nature of polyphenylenes and polyphenylene-based polymers, excellent resistance to oxidation and thermal degradation is one of the most attractive characteristics of these systems. Many workers have reviewed such subjects as synthesis, properties, applications of polyphenylenes, due to their possible use as semiconductors, photoconductors, solid lubricants, etc., over the last few decades [178-180]. 

In addition, some quinacridones have found unusual applications. For example, both quinacridone and its 2,9-dimethyl derivative have been found to exhibit desirable photovoltaic characteristics , and show relatively high power conversion efficiencies in solar cell fabrication. Some quinacridones have also been found to be reasonably good photoconductors, and 2,9-dichloroquinacridone has been shown to be a photoreceptor in electrophotography. A variety of other atypical applications have also been claimed in the patent literature. 

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