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|Title:||Recent trends in conducting polymers: Problems and promises|
|Abstract:||Conducting polymers exhibit one of the most versatile behaviour of polymer materials. This review reports right from the synthesis to the applications of these new electronic materials and discusses the associated challenges and solutions. These polymers may be synthesized by conventional chain and step polymerization techniques as well as a few other special processes including electrochemical synthesis. The problems of polymer synthesis in general and synthesis of these electro active polymers in particular have been discussed. The incorporation of oxidizing or reducing agents into these polymers, known as 'doping', type of doping agents used, the mechanism of doping and finally the influence of the nature and level of dopants incorporated on the conductivity and other properties of polymers have been discussed. The conductivity of these polymers also depends on a number of factors, viz., technique of synthesis and processing of polymers, their crystallinity and molecular structure, and temperature of the used environment. Since the dopants are small molecular weight materials and are required in some cases as high as 30-50% of the polymers, the macromolecular properties are thus compromised by d ping. A new type of polymers known as narrow bandgap polymers has therefore been developed which does not require any external dopants. This may be achieved by reducing the aromaticity or by increasing the content of quinoid form or by incorporation of empty p-orbitals in the polymer chain , Stability and processability problems of doped polymers an various means to overcome these have also been discussed. By introducing ionizable groups in the polymer chain, intrinsic conducting polymers may also be obtained which do not require external dopants, Finally, some of the potential areas of applications of these new electronic materials and their promises have been discussed.|
|Appears in Collections:||IJC-A Vol.33A(06) [June 1994]|
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