Viscoelastic Properties Of Polyurethane Matrix Composites Filled With Amorphous TiO₂ Particles

Polyurethane is a kind of polymer material with the properties of both rubbers and plastics.Since polyurethane materials are provided with the high elastic modulus and the unique viscoelasticity of the polymer materials,they have high application value in vibration and noise reduction,intelligent composite materials and other fields.At present,ordinary polyurethane materials could not meet the requirements of increasingly high demand in engineering applications,thus many researchers modified them with fibers,nano-particles or other fillers.As an important inorganic materials,titanium dioxide?TiO₂?are widely used in medicine,chemical fiber and intelligent materials because of their excellent chemical stability,heat resistance and high dielectric constant.The modification of polyurethane materials with nano-TiO₂ particles has aroused wide attention,and some reports have been published on them in recent years.However,few studies have focused on the polyurethane materials modified with amorphous TiO₂ particles,especially the viscoelasticity of TiO₂ particles filled polyurethane materials.For particles filled polyurethane composites,the viscoelasticity of which is affected by particle content,particle distribution and matrix composition.To explore the influence of these factors,the pre-structure of polyurethane elastomers is designed with the dielectric properties of amorphous TiO₂ particles.Besides,the influence of particle distribution,particle content and hard segment content on the viscoelasticity of the materials properties is discussed in this study.The main conclusions are listed as follows:?1?The storage modulus and loss modulus of the composites both increase with the ascending volume fraction of the particles.?2?As the mass fraction of hard segments ascend,the storage modulus and loss modulus increase,while the creep strain and residual strain decrease.Besides,with the increase of the hard segment mass fraction,the energy dissipation density of the materials decrease first and then increase.?3?The storage modulus and loss modulus of the polyurethane-based composites filled with oriented particles are higher than those of the samples containing non-oriented particles.The creep strain and the residual strain of the polyurethane-based composites with aligned pre-structures are all larger than those of specimens with the non-oriented structures.The present work improves the research system of viscoelastic properties for polyurethane matrix composites,and provides theoretical and experimental basis for further application of polyurethane elastomer in the field of isolation and vibration reduction.