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Conducting polymers required characteristics

Processable conducting polymers, either by melt or solution means, are suitable for fabrication into the myriad of devices envisaged for these dynamic polymer systems. The nature of the fabrication process is necessarily determined by the performance required of the final product. However, the ultimate size and cost of the fabricated part are equally as important as the performance characteristics. In this section, we review some recent developments in the area of printing and fiber-spinning technologies that will impact the fabrication of conducting polymer devices in the future. [Pg.243]

The research into proton conducting polymer electrolytes has consistently increased in recent years due to the transport characteristics which make them promising for various electrochemical applications of interest for the electronics market, including sensors and, particularly, fuel cells [113]. Nevertheless, the proton conductivity of the known polymer systems still remains below the upper limit of proton conductivity in liquids. The major problems arise from the numerous additional requirements, other than proton conductivity, which must be met for any specific application. [Pg.239]

In conclusion, some very important experiments have been performed in attempting to establish the electrode characteristics of the electroactive/conductive polymers. Continued work with these materials will require a parallel effort in improving their properties, if they are to successfully impact a technology. [Pg.136]

The most important characteristic of monomer molecules for the formation of a conducting polymer is the requirement for the conversion of a closed-shell system to a corresponding cation or anion radical and the stability of the product to form during the process. Polyaniline is prepared by either chemical or electrochemical oxidation of aniline under acidic conditions. An aqueous medium is preferred. The synthesis of polymer by either chemical or electrochemical methods depends upon the intended application of the polymer. Whenever thin films and better-ordered polymers are required an electrochemical method is preferred. [Pg.507]

The most important characteristic of monomer molecules for the formation of a conducting polymer is the requirement for the conversion of the closed-shell system to corresponding cation or anion radicals and the stability of the product formed during the process. [Pg.519]

Metallophthalocyanine polymers offer good stability in thermal, chemical, hydrolytic and photochemical environments. The reversible redox property and cycle stability of phthalocyanine compounds and their polymers make them useful as active components in sensors, switches, diodes, memory devices, NLO materials, etc. different types of phthalocyanine polymers are available and they are amenable to chemical modifications to suit the devices requirements. It is possible to exercise chemical control of the properties of the phthalocyanine polymers as well as functionalize other conducting polymers with the characteristics of phthalocyanines. Hence phthalocyanine polymers have become potential candidates for producing useful and viable materials for electronic, optoelectronic and molecular electronic applications. [Pg.766]

As with any prospective new application we reasoned that optimization of physical and chemical properties would be required in order to generate practically useful electrically conductive polymers. We were concerned about mechanical properties, flexibility, conductivity levels, solubility, processability, oxidative stability, etc. Based upon the perceived requirement of a conjugated polyene structure, substituted polyacetylenes were the obvious way to introduce substituents for the purpose of tailoring these characteristics. Unfortunately the literature provided ample evidence of the sluggish nature of substituted polyacetylenes toward polymerization. [Pg.382]

ECG electrodes vary in size, desi, and nature of conductive polymer system depending on the intended use. Diagnosis using resting electrodes requires that the patient remain motionless and relaxed for a relatively short time (< 0.5 h). In contrast, padent monitoring may require extended wear capalnlity (ca. S days) combined with good shear holding characteristics for ambulatory patients. [Pg.297]

Interpretation of Fig. 5.54 requires consideration of polymer flow characteristics. When steady-slate displacement tests are conducted with a polymer solution, as discussed in Sec. 5.4, the polymer mobility is extracted from the experimental data. Permeability to polymer can be calculated if the apparent viscosity of the polymer solution is known at the Darcy velocity of the polymer phase. For the core in Fig. 5.54, the apparent viscosity was determined with Eq. 5.18 to be 2.3 cp at S r from the polymer mobility with kp=kwp. Because the effective polymer viscosity at Spr did not vary significantly with flow rate, the apparent viscosity for relative permeability computations was assumed to be constant throughout the steady-state tests. The relative permeability curve for polymer solution is significantly less than the corresponding relative permeability curve for the displacement of water before contact of the core with polymer solution. [Pg.33]


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See also in sourсe #XX -- [ Pg.273 ]




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