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Elastomer/Nanographite Composites for Mechanical and Chemical Sensing

By Māris Knite, Ludmila Matzui, Juris Zavickis, Gita Šakale, Artis Linarts, Kaspars Ozols and Ilze Aulika

Abstract

black composites we can achieve excellent piezoresistivity effect [1] as well as chemoresistivity effect [2] for these composites. In this study we attempt to design polyisoprene matrix composites with promising more sophisticated fillers – thermoexfoliated graphite (TEG) as well as multiwall carbon nanotubes with high (LMWCNT) and low (SMWCNT) aspect ratio for their application in design of new sensitive polymer composites. TEG has been synthesized in Department of Physics of Kyiv National Taras Shevchenko University. Powders of LMWCNT and SMWCNT have been bought from Cheap Tubes Inc. Polyisoprene/TEG and polyisoprene /MWCNT composites were prepared in Institute of Technical Physics of Riga Technical University. Firstly each filler party was dispersed in chloroform in one vessel by ultrasonic homogenizer. Secondly polyisoprene and necessary additives, zinc oxide and sulphur were dissolved in chloroform in another vessel by magnetic stirring. After the definite filler dispersion was added to polyisoprene solution and the mixture was mixed by magnetic stirring for 24 hours. From the obtained raw mixture chloroform was evaporated. Finally the mixture was vulcanized under pressure of 30 atm at 150oC for 15 minutes. The acquired nanocomposite samples were electrically conductive and showed the ability to change the electrical resistance under the influence of mechanical force and volatile compound vapours as well

Topics: nanographite, chemoresistivity, piezoresistivity, pressure sensor, chemical sensor, nanostructured, nanocomposite, elastomer
Publisher: The Institute of Chemical Engineering Sciences
OAI identifier: oai:ortus.rtu.lv:14249
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