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Vol. 12, Special Issue, October 2011, pp.66-70

 

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Ultrasonic Characterization of Dynamic Elastic Properties of Polymer Composites with Inorganic Nanotubes

 

1 V. SAMULIONIS, 1 J. BANYS, 2 A. SANCHES-FERRER and 2 R. MEZZENGA

1 Faculty of Physics, Vilnius University, Vilnius, Lithuania

2 Institute of Food Science and Nutrition, ETH Zurich, Switzerland

E-mail: vytautas.samulionis@ff.vu.lt

 

 

Received: 15 June 2011   /Accepted: 18 July 2011   /Published: 31 October 2011

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Abstract: The temperature dependencies of ultrasonic velocity and attenuation were measured in pure polyurea elastomer and doped with inorganic MoS2 nanotubes. Below room temperature the large ultrasonic relaxational attenuation maxima and velocity dispersion were observed. It was found that the attenuation peak in elastomer shifted to lower temperature after doping with nanotubes. The ultrasonic attenuation data were fitted to relaxation equation with temperature dependent relaxation time. The thermal activation energy of relaxation process, which was calculated from ultrasonic data, was found to increase in polyurea elastomer doped with MoS2 nanotubes. The low temperature ultrasonic velocity increases in polymer with nanotubes and it is determined by the increase of elastic modulus.

 

Keywords: Ultrasonic attenuation, Ultrasonic velocity, Elastomer composite with inorganic nanotubes, Thermal activation energy

 

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