Study On Preparation And Performance Of Carbon-based Materials Doped Polyurethane Damping Composite

With the rapid development of industry,the problems of noise and vibration pollution have become seriously,which has adversely affected health and environment.Damping materials are the key to solving this problem.In order to solve these problems,various damping systems have been developed to reduce the damage caused by vibration.The improvement of damping system performance mainly depends on the damping materials.However,traditional damping materials can hardly meet the needs of the development of modern industry.A suitable damping material should have a high damping peak and a wide damping temperature range.In this study,an interpenetrating polymer network(IPN)system was synthesized by two polymers to broaden the damping temperature range.In order to broaden the damping temperature range while not reducing the damping peak,the polymer matrix was introduced with different morphologies carbon-based particles.The purpose is to analyze the influence of different particles on its damping performance.The investigation result is as follows:1.Polyurethane and acrylate resin were used as the polymer matrix for preparation of polyurethane(PU)/ethyl methacrylate(PEMA)interpenetrating network polymer,and then freeze-dried graphene particles were added to the polymer matrix to obtain graphite modified PU/PEMA IPN damping composite material to obtain graphene modified PU/PEMA IPN damping composite material.The microstructure analysis of SAXS and SEM proved the existence of the IPN structure,and the graphene can be uniformly dispersed in the IPN matrix under appropriate ratio conditions.XRD results showed that the interlayer spacing of the matrix increases with the addition of graphene.DMA research has found that graphene has a significant impact on the damping performance of the IPN polymer system,with a peak loss factor of 0.68.At the same time,the damping temperature range has also been broadened and the damping performance has been improved.2.The graphite was used as inorganic particles modifier.In the first step,the graphite was dispersed in polyurethane prepolymer,and polyurethane prepolymer filled with graphite was mixed with acrylate resin.The mixture was cured under the two-component curing agent to form an interpenetrating polymer network.The structure of graphite modified PU/PEMA IPN composite material,and the influence of graphite content on the microphase structure and damping performance of the IPN matrix was studied.Graphite-modified PU/PEMA IPN composites generally show good damping performance.When the addition amount is 0.5wt.%,the loss factor reaches 0.46.At the same time,the addition of graphite makes the peak of the glass transition temperature of the composite move to high temperature.The DSC test results also exhibited the same conclusion,and the XRD test of this change in damping performance is mainly derived from the multi-layer structure of graphite embedded in the polymer,which increases the interlayer spacing of the graphite in the matrix,and the characteristic peak of graphite did not disappear,indicating that a graphite intercalation composite material was formed.3.The porous carbon with a large specific surface area is selected and added to the interpenetrating network polymer matrix composed of polyurethane material and acrylate to synthesis a porous carbon modified PU/PEMA IPN composite material.First,the basic structure and porosity of porous carbon particles were verified.Porous carbon has a large specific surface area and the pore size is uniformly about 2.27 nm.XRD test of porous carbon shows an amorphous carbon structure.DMA research found that the glass transition temperature of the porous carbon-modified PU/PEMA IPN composite material shifted to high temperature,exhibiting good damping performance,widening the damping temperature range.The dielectric performance has also been improved.When the addition amount of porous carbon is 2.0wt.%,the dielectric constant increases to 12,which has good a prospect for applications.4.Through the comparison of the modification results of the PU/PEMA IPN matrix with the above carbon particles,it can be found that all carbon particles have a positive effect on the damping performance.The rigid particle increases the friction loss inside the material,the loss factor has been improved,therefore the damping temperature range has been broadened.The effect of graphene particles on the damping is the most significant.Because of its unique layer structure,the friction between the graphene and the substrate is enhanced,which makes the most obvious contribution to damping performance.Due to the extremely heat resistance of graphite,the thermal stability is the best of the three kinds of particles.The initial decomposition temperature reaches 293.1°C,which is 24°C higher than that of the unadded matrix material.Although the particles have different effects on the performance improvement of the matrix,it cannot be denied that the doping of these three kinds of carbon-based particles has brought improvements in material mechanics and thermodynamic properties.Therefore,the damping material modified by carbon particles has good comprehensive performance and broad application prospects.