Low Frequency Relaxation in Block Copolymers and Nanocomposites

Abstract:

Results of the loss tangent, tan δ, at low frequencies, obtained for a SEBS copolymer and carbon nanotube (CNT)/polyurethane (PUR) nanocomposites, are analysed. The hindering effect of nanostructures (i.e. ordered domains or nanoparticles) on the motion of polymer chains is revealed by the occurrence of a mechanical relaxation at low frequencies. In the case of SEBS copolymer, the effect of domains orientation and extender oil on a characteristic time associated with the relaxation is investigated. For CNT/PUR nanocomposites, the variation of the frequency at which the relaxation takes place, with CNT concentration and temperature, reveals that the interactions between the nanotubes and the polymer chains are improved with temperature

• Periodical: Materials Science Forum (Volume 714)
• Pages: 67-72
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.714.67
• Online since: March 2012
• Authors: Anton Santamaria, Mercedes Fernández, María Eugenia Muñoz
• Keywords: Block-Copolymer, Carbon Nanotube (CN), Loss Tangent, Mechanical Relaxation, Nanocomposite

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DOI: 10.1002/pssb.200879622