Carbon loaded polymers, applications

Fabrication of conducting plastics, mostly blends in which the conducting polymer is associated with another polymer that has better mechanical properties, is probably the most developed application of conducting polymers. Such polymeric blends appear to be better solutions than carbon black-loaded polymers. This is because, on the one hand, mechanical properties of conducting polymers are better than those of carbon black, and, on the other, the characteristics of polymeric... 

In this study the concept of the triple-continuous structure is apphed to several polymer/polymer blends loaded with carbon nanotubes or graphite particles with an aim to obtain injection moldable carbon-fiUed polymer blends with high electrical conductivities and snfficient mechanical properties for the bipolar plate application of PEM fuel cells. The distribution of CNTs in the polymer blends is examined in terms of their wetting coefficients and minimization of the interfacial energy. The relationships among the microstructure, electrical conductivity, and mechanical properties are studied with an emphasis on achieving simultaneous improvement in both conductivity and tensile strength. 

Carbon-supported platinum (Pt) and platinum-rathenium (Pt-Ru) alloy are one of the most popular electrocatalysts in polymer electrolyte fuel cells (PEFC). Pt supported on electrically conducting carbons, preferably carbon black, is being increasingly used as an electrocatalyst in fuel cell applications (Parker et al., 2004). Carbon-supported Pt could be prepared at loadings as high as 70 wt.% without a noticeable increase of particle size. Unsupported and carbon-supported nanoparticle Pt-Ru, ,t m catalysts prepared using the surface reductive deposition... 

According to the data in Table 25.5 and to Eq. (25.6) the compressive strength of filaments of refractory materials such as carbon and silicon carbide have compressive strengths about 10 times as large as those of organic fibres. This would seem to be a serious restriction to the use of organic polymers such as aramids in their application in composites. For most of the applications this restriction is of minor importance, however, since long before ac max is reached, instability in the construction will occur. The resistance of a column or a panel under pressure is proportional to the product of a load coefficient and a material efficiency criterion ... 

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