Preparation and electrostriction of BaTiO_3/polyurethane nanocomposite elastomers

摘要

BaTiO_3/polyurethane (BaTiO_3/PU) nanocomposite elastomers were prepared from barium titanate nanoparticles, polyester polyol,2,4-toluene diisocyanate, 1,4-butanediol and 1,1, 1-trimethanol propane by the one-step method. The density, hardness and dielectric constant of BaTiO_3/PU nanocomposite elastomers increased with the increase of the content of BaTiO_3 nanoparticles in nanocomposites. The electrostrictive properties of BaTiO_3/PU nanocomposite elastomers were investigated by the digital speckle correlation method (DSCM). It was found that through the on-and-off of the electric field, the electrostrictive strains of BaTiO_3/PU nanocomposite elastomers revealed corresponding shrinkage and recovery. The electrostrictive coefficient of BaTiO_3/PU nanocomposite elastomers was greater than that of the corresponding polyurethane elastomers, and the electrostrictive coefficient of composites decreased with the increase of the content of barium titanate nanoparticles.