Resumo

LEAL, Artur S. C.; SILVA, Suédina M. L.  e  ARAUJO, Carlos J. de. Thermomechanical behavior of active composites prepared with epoxy/organoclay nanocomposites and Ni-Ti shape memory alloy wires. Polímeros [online]. 2012, vol.22, n.2, pp. 134-141.  Epub 10-Abr-2012. ISSN 0104-1428.  http://dx.doi.org/10.1590/S0104-14282012005000020.

In this work, epoxy/organoclay nanocomposites were selected as matrix for presenting high enough glass transition temperature (T_g) and thermal stability values in order to be incorporated in shape memory alloys (SMA). Four volume fractions of SMA wires containing Ni-Ti (1.55, 2.56, 3.57 and 4.54%) were embedded in diglycidyl ether of bisphenol A (DGEBA), cured with the aromatic amine 4,4’-diamino diphenyl sulfone (DDS) and containing 1 phr of purified organobentonite (APOC). The formation of nanocomposite was confirmed by X ray diffraction analysis, while the phase transformation of Ni-Ti wires was determined by dynamic mechanical analysis (DMA). Samples of the active composites prepared from nanocomposite matrix and Ni-Ti wires were mainly characterized by DMA. A recovery of the storage modulus of the active composite was observed during heating in the range of phase transformation of Ni-Ti wires when the volume fraction was maintained at around 3.5%.

Palavras-chave : Epoxy nanocomposite; shape memory alloys; active composites.