Dresden 2014 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 41: Nanoparticles and Composite Materials

CPP 41.9: Vortrag

Donnerstag, 3. April 2014, 11:45–12:00, ZEU 222

Anomaly in thermal and mechanical properties of SBR/alumina nanocomposites — •Rymma Sushko, Jörg Baller, Marlena Filimon, and Roland Sanctuary — Laboratory for the Physics of Advanced Materials, University of Luxembourg, 162a avenue de la Faiencerie, L-1511, Luxembourg

Filling elastomers with nanoparticles generally leads to changes in the relaxation behavior of the matrix molecules. Using dynamic mechanical analysis (DMA) and temperature modulated calorimetry (TMDSC), we investigated the influence of different amounts of untreated, hydrophilic alumina nanoparticles on the properties of a model rubber system (SBR). Beside a reinforcement effect seen in the complex elastic moduli, small amounts of nanoparticles of about 2 wt% interestingly lead to an acceleration of the relaxation modes responsible for the thermal glass transition. This leads to a minimum in the glass transition temperature as a function of nanoparticle content in the vicinity of this critical concentration. The frequency dependent elastic moduli are used to discuss the possible reduction of the entanglement of rubber molecules as one cause for this unexpected behavior.