Structure And Properties Of Rigid Polyurethane Foam Damping Material

Mechanical vibration and noise not only hurt system of human being but also threaten the precise of instrument, and damping technology is one of the most efficient methods to control them. Polyurethanes are particularly attractive for a study of the effect of chemical structure on damping because it is possible to change the ratio of hard and soft segments. Rigid polyurethane foam (RPUF) is widely used in adiabatic material and structure material, but that is litter paper focused on its damping property. In this thesis, molded foaming is employed to prepare rigid polyurethane foam with different types by varying formulations and processing conditions.Mechanical test and dynamic mechanical analysis test are performed to discuss the relation between structure and properties.The effects of chain extender with different proportion and different types on RPUF are studied. The results show that the impactive property and compressive property of RPUF are enhanced with the ethylene glycol dose at 3 to 7, but the mechanical properties would be declined when the ethylene glycol dose at 1 and 10 because of the separation of two segment. The damping properties of RPUF would be reduced with the improving of chain extender. The impactive property of RPUF would be improved with the improving of carbon number or the side group, but the result is right-about if the chain containing soft group.The temperature of glass transition would be moved to low temperature with the improving of the number of carbon, and the damping factor would be increased with the side group or the soft group.The influences of the polyether with different proportion and different types on RPUF are researched. The result show that the damping property in low temperature of the RPUF would be improved with all of the polyalcohol, including polyethylene glycol (PEG400), polytetramethylene ether glycols (PTMG1000), and polyether triol 330.The temperature range of the RPUF glass transition containing PTMG1000 or polyether triol 330 would be wider, but the compressive properties would be fallen. The impactive properties of PRUF containing mixing polyether would be better.The damping factor of RPUF with filler could be improved, but the structure of cell would be destroyed, and the mechanical properties would be reduced. The temperatures of the RPUF glass transition with different average cell diameters are mostly sameness, but the temperature range of the glass transition and the storage module are obvious difference.