Applications, polymers undoped performances

Nevertheless the attention devoted to study and improve the performances of coatings based on pure CPs (doped or undoped), their application to corrosion protection is, however, subject to some limitations. The reasons are essentially two (i) the charge stored in the polymer layer (used to oxidise base metal and to produce passive layer) can be irreversibly consumed during the system redox reactions, and (ii) some intrinsic porosity cannot be avoided. Consequently, protective properties of the polymer coating may be lost with time. 

The chapter describes some fundamental aspects concerning electrical conduction in polymers (in undoped and doped stales) and their composites. The current characterization methodologies for electrical conductivity are presented. The performance of polymers containing single or multiple conductive phases is reviewed in accordance with the applications of these multiphase materials in electronics, optoelectronics, and in other fields. 

Conjugated polymers, in the undoped state, exhibit the electronic and optical properties of semiconductors in combination with the mechanical properties of general polymers, making them potentially useful for a wide array of applications particularly in organic optoelectronic devices such as polymer LEDs, photodetectors, photovoltaic cells, etc. Development in the performance of such devices has advanced rapidly, and prototype devices now meet realistic specifications for practical applications. In spite of such successful achievements in the scope of device application, however, there is still controversy over the nature of the electronic structure and the appropriate description of the underlying physics of elementary excitations. Since these issues are both scientifically interesting and critically important to the assessment of the future potential of devices based on conjugated polymers, more detailed... 

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