Multi-dynamic bond reinforced polyurethane elastomer with outstanding damping characteristics and mechanical properties

Abstract

Polyurethane elastomer (PUE) has become an ideal material for vibration damping and noise reduction due to its outstanding viscoelastic and molecular structural designability. However, existing materials generally struggle to overcome the effects of temperature changes because of their narrow glass transition range. Here, we innovatively synthesized a novel chain extender (HDF) using 5-hydroxymethylfurfural and 2,2′-diaminodiphenyl disulfide as raw materials, and introduced it together with isophorone diisocyanate into the PUE. The PUE cured with HDF exhibits outstanding damping properties, which are mainly attributed to the reversible exchange of dynamic bonds within its molecular network and the disruption of segment regularity caused by the irregular alicyclic structure of Isophorone diisocyanate. Experimental results demonstrate that PUE-HDF exhibits a broad effective damping temperature range of −19 to 115 °C and a high tan δ of 1.38. Additionally, the tan δ remains above 0.6 over the vibration temperature range of −15 °C to 40 °C. Notably, the tensile strength and elongation at break of the PUE increased to 19.1 MPa and 626%, respectively. This study develops a high-performance PUE damping material, aiming to further advance the development and application of dynamic bonds for reducing vibration and noise.