Blend conducting polymer based

Conducting polymers based on carbon black should contain a small amount of carbon black to facilitate processing. To reduce the amount of carbon black, one must create inhomogeneity in the material either by using the system which rejects carbon black from the crystalline region (opposite to the PCL/PVB blend above) or... 

M. Kotaki, X-M. Liu, and C. He, Optical properties of electrospun nanofibers of conducting polymer-based blends, J. Nanosci. NanotechnoL, 6, 3997-4000 (2006). 

Intrinsically Conducting Polymer-Based Blends and Composites for Electromagnetic Interference Shielding Theoretical and Experimental Aspects... 

Intrinsically Conducting Polymer-Based Blends 471 Table 9.1 Conversion techniques, S-parameters, and output attributes. 

When control of structural parameters of the polymer is achieved, properties of the material will also depend on processing routes. Processing routes will have an inq)act on polymer chain conformation and then on localization of charge carriers. Polymers are mainly processed from solutions or from their molten state. We will show here the extreme importance of the conformation of polymers in solution when one is concerned with final electrical properties. The conformation of polymer in solution can be tailored by a careful choice of the solvent type, i.e. dielectric constant and solubility parameters or some added salts in the solution. Even in the case of extrusion, when the polymer is processed in the molten state, the prior conformation in solution plays an important role on the final properties of conductive polymer based blends. 

Common conductive polymers are poly acetylene, polyphenylene, poly-(phenylene sulfide), polypyrrole, and polyvinylcarba2ole (123) (see Electrically conductive polymers). A static-dissipative polymer based on a polyether copolymer has been aimounced (124). In general, electroconductive polymers have proven to be expensive and difficult to process. In most cases they are blended with another polymer to improve the processibiUty. Conductive polymers have met with limited commercial success. 

Distribution of Filler in Conducting Polymer Composites Based on Polymer Blends... 

One more fact, important in practice, lies in that a of the compositions based on heterogeneous blends of polymers obtained by the method 3, depends considerably on mixing temperature Tm. This is bound up with a variation of the polymer viscosity with the temperature on being introduced into the polymer mixture, a filler becomes distributed mostly in the less viscous polymer and, if the viscosity of polymers is almost the same, it is distributed comparatively uniformly and a of the composition decreases. Therefore, the dependence of a of the conducting polymer composite on Tm has a minimum (by a factor of 102 to 104) in the Tm region when the viscosities of the polymer components are close. 

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