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Dynamic- and Thermo-mechanical Analysis of Inorganic Nanotubes/elastomer Composites

By Armin Fuith, Marius Reinecker, Antoni Sanchez-Ferrer, Raffaele Mezzenga, Aleš Mrzel, Māris Knite, Ilze Aulika, Marija Dunce and Wilfried Schranz

Abstract

We present dynamic mechanical analysis (DMA) and thermomechanical analysis (TMA) measurements of a new type of polyurea elastomer nanocomposites based on inorganic MoS2 nanotubes and Mo6S2I8 nanowires. The addition of a small amount of nanoparticles (<1 wt-%) leads to an increase of the glass transition temperature Tg as compared to the pure elastomeric matrix. A second peak observed in tan in the pure and mixed elastomer is attributed to a second glass transition occurring in regions near the hard nanodomains of the microphase separated polyurea system. It is also found that the small amount of nanoparticles leads to an increase in the Young´s modulus of up to 15 % in the whole measured temperature range (from -130 °C to 20 °C). The thermal expansion of doped samples is considerably larger above Tg. Below Tg, this difference vanishes completely. A very similar behaviour was also found in measurements of polyisoprene/multiwall carbon nanotube (MWCNT) composites. Copyright © 2011 IFSA

Topics: Inorganic nanotubes, Polymer nanocomposites, Dynamic mechanical analysis, Thermomechanical analysis, Glass transition, Elastomer, Polyurea
OAI identifier: oai:ortus.rtu.lv:11576
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