naa a22 4500 510803814 CHVBK 20180411083407.0 cr unu---uuuuu 180411e20131001xx s 000 0 eng 10.1007/s11664-013-2689-6 doi (NATIONALLICENCE)springer-10.1007/s11664-013-2689-6 Effects of Compression and Filler Particle Coating on the Electrical Conductivity of Thermoplastic Elastomer Composites [Elektronische Daten] [Willem Albers, Mikko Karttunen, Lisa Wikström, Taisto Vilkman] Elastomeric polymers can be filled with metallic micro- or nanoparticles to obtain electrical conductivity, in which the conductivity is largely determined by the intrinsic conductivity of and contact resistance between the particles. Electrons will flow through the material effectively when the percolation threshold for near-neighbor contacts is exceeded and sufficiently close contacts between the filler particles are realized for electron tunneling to occur. Silver-coated glass microparticles of two types (fibers and spheres) were used as fillers in a thermoplastic elastomer composite based on styrene-ethylene-butylene-styrene copolymer, and the direct-current (DC) resistance and radiofrequency impedance were significantly reduced by coating the filler particles with octadecylmercaptan. Not only was the resistance reduced but also the atypical positive piezoresistivity effect observed in these elastomers was strongly reduced, such that resistivity values below 0.01Ωcm were obtained for compression ratios up to 20%. In the DC measurements, an additional decrease of resistivity was obtained by inclusion of π-extended aromatic compounds, such as diphenylhexatriene. Some qualitative theories are presented to illuminate the possible mechanisms of action of these surface coatings on the piezoresistivity. TMS, 2013 Electron tunneling nationallicence SEBS nationallicence elastomer nationallicence silver filler nationallicence molecular wires nationallicence Albers Willem VTT Technical Research Centre of Finland, Sinitaival 6, P.O. Box 1300, 33101, Tampere, Finland aut Karttunen Mikko VTT Technical Research Centre of Finland, Sinitaival 6, P.O. Box 1300, 33101, Tampere, Finland aut Wikström Lisa VTT Technical Research Centre of Finland, Sinitaival 6, P.O. Box 1300, 33101, Tampere, Finland aut Vilkman Taisto Premix Oy, Muovitie 4, P.O Box 12, 05201, Rajamäki, Finland aut Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/10(2013-10-01), 2983-2989 0361-5235 42:10<2983 2013 42 11664 https://doi.org/10.1007/s11664-013-2689-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11664-013-2689-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Albers Willem VTT Technical Research Centre of Finland, Sinitaival 6, P.O. Box 1300, 33101, Tampere, Finland aut NATIONALLICENCE 700 1- Karttunen Mikko VTT Technical Research Centre of Finland, Sinitaival 6, P.O. Box 1300, 33101, Tampere, Finland aut NATIONALLICENCE 700 1- Wikström Lisa VTT Technical Research Centre of Finland, Sinitaival 6, P.O. Box 1300, 33101, Tampere, Finland aut NATIONALLICENCE 700 1- Vilkman Taisto Premix Oy, Muovitie 4, P.O Box 12, 05201, Rajamäki, Finland aut NATIONALLICENCE 773 0- Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/10(2013-10-01), 2983-2989 0361-5235 42:10<2983 2013 42 11664 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer