Damping analysis of polyurethane/polyacrylate interpenetrating polymer network composites filled with graphite particles

Abstract

The graphite‐filled polyurethane/poly(methyl methacrylate‐butyl methacrylate) (PU/P(MMA‐BMA)) semi‐interpenetrating polymer networks (IPNs) were synthesized by sequential method. The influences of graphite particle content and size on the 60/40 PU/P(MMA‐BMA) IPNs were studied. The damping properties of IPN composites were evaluated by dynamic mechanical thermal analysis (DMA) and cantilever beam resonance methods. The mechanical performances were investigated using tensile and hardness devices. DMA results revealed that the incorporation of graphite particles improved damping properties of IPNs significantly. The 5% graphite‐filled IPN composite exhibited the widest temperature range and the highest loss factor (tan δ) when the test frequency was 1 Hz. As to the damping properties covering a wide frequency range from 1 to 3,000 Hz, the addition of graphite particles broadened the damping frequency range (Δf, where tan δ is above 0.3) and increased the tan δ value of IPNs. Among them, the composite with 7.5% graphite showed the best damping capacity. And the hardness and the tensile strength of IPN composites were also improved significantly. POLYM. COMPOS., 2013 © 2013 Society of Plastics Engineers

Effects of multiwall carbon nanotube and perfluoroalkane additives on the sound absorption properties of flexible polyurethane foams

“…Polyurethane foam (PUF) has been widely studied due to its various thermal insulating applications in building construction, liquefied natural gas storage tank and carrier formers, and refrigeration [1][2][3][4][5][6][7][8][9]. Another important application is as sound absorber in the design of automobiles, using the acoustic damping abilities of PUF [1,2,[10][11][12][13][14][15][16]. There are several different frequency ranges in a vehicle, some of which originate from the rotation of the engine at 5-50 Hz, and some result from the uneven surface of the road and transfer into the vehicle in the frequency range of 500-3,000 Hz [12].…”

Cyclic compression behavior and energy dissipation of aluminum foam–polyurethane interpenetrating phase composites

“…When load is applied to AF-PU composite in Fig.3a, the stress starts to increase linearly with the strain in the linear elastic deformation regime where the stress doesn't exceed the yield stress ߪ ௬ (as critical point marks in figure), because corresponding AF are in the state of elasticity for this region of AF-PU composite [1,2] and corresponding PU with characteristics of hyper-elasticity all the time [22,24]. Afterwards, stress almost remains constant as the strain increased, though stress slightly decreases after 5% strain for the sake of fatigue damage of continuous loading/unloading.…”

“…Therefore, the mechanical parameters affecting the performance of AF and PU, respectively, also affect the mechanical behavior and structural stability of AF-PU composites. Different relative densities and pore size are two main factors influencing mechanical behavior of AF [13][14][15][16][17][18][19] and the usual influence parameters on the absorbed mechanical energy of PU are frequency, temperature and vibration amplitude [20][21][22][23][24]. In order to understand what kind of AF-PU materials are the most suitable for applying hysteretic damping devices in seismic resistant buildings, we will investigate the damping capacity of AF-PU composites with different corresponding porosity and pore size under different cycling frequency, vibration amplitude, temperature aging and cycle numbers.…”

Synthesis and characterization of bio‐based PA/EP interpenetrating network polymer as coating material for controlled release fertilizers

“…Interpenetrating polymer network (IPN) is a unique type of polyblend or polymer alloy, which consists of two or more crosslinked polymers held together by permanent physical entanglement or only occasional covalent chemistry bonds between the chains of the two different polymers in a network form . The IPN presented excellent thermal stability and mechanical properties because of the mutual entanglement, forced compatibility, synergism of the networks and multiphase, continuous microstructure .…”