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P(U-MMA-ANI) interpenetrating polymer network (IPN) damping and absorbing material is successfully synthesized by PANI particles served as an absorbing agent with the microemulsion polymerization and P(U-MMA) foam IPN network structure for substrate materials with foaming way. P(U-MMA-ANI) IPN is characterized by the compression mechanical performance testing, TG-DSC, and DSC. The results verify that the P(U-MMA) IPN foam damping material has a good compressive strength and compaction cycle property, and the optimum content of PMMA was 40% (mass) with which the SEM graphs do not present the phase separation on the macro level between PMMA and PU, while the phase separation was observed on the micro level. The DTG curve indicates that because of the formation of P(U-MMA) IPN, the decomposition temperature of PMMA and the carbamate in PU increases, while that of the polyol segment in PU has almost no change. P(U-MMA-ANI) IPN foam damping and absorbing material is obtained by PANI particles served as absorbing agent in the form of filler, and PMMA in the form of micro area in substrate material. When the content of PANI was up to 2.0% (mass), the dissipation factor of composites increased, and with the increasing of frequency the dissipation factor increased in a straight line.

To strengthen waterborne polyurethane/polyvinyl alcohol nanofibers which is a potential filtering material, in this work, modified graphene oxide (GO) was mixed into the solution of waterborne polyurethane and polyvinyl alcohol. By electrospinning, the modified GO/waterborne polyurethane/polyvinyl alcohol nanofibers were prepared. The composite nanofibers showed good thermal behavior due to the addition of modified GO. The results show that the maximum thermal decomposition temperature of nanofibers film increased by 26 °C when the content of modified GO was 0.4% in the composite nanofiber. At the same time, the tensile property of the composite nanofiber was improved and a better mechanical behavior appeared when using a rotating way to fabricate the nanofibers, which the value of tensile length at break in the radial direction and tensile strength at break in arc direction rose by 68.7% and 38.7% separately. [ABSTRACT FROM AUTHOR]

Simethicone MMT/PU microspheres were prepared with polyurethane (PU) and montmorillonite (MMT) as main materials by interfacial polymerization and simethicone as core material was coated into microspheres. The microspheres morphologies and composite physical states were investigated using scanning electron microscopy (SEM), thermogravimetry analysis (TG), fourier transform infrared (FTIR) spectroscopy and dynamic thermomechanical analysis (DMA). Scanning electron microscopy observations revealed that simethicone MMT/PU microspheres had a good spherical structure. Results from FTIR and TG suggested that the MMT had been successfully introduced to the polyurethane molecular chain and simethicone MMT/PU microspheres had good thermal stability under 225°C. Results from DMA suggested that damping properties of simethicone MMT/PU/EP composites were significantly improved. As simethicone MMT/PU microspheres were introduced into epoxy resin (EP), the maximum loss factor of simethicone/MMT/PU/EP composites increased by 90% than pure EP. [ABSTRACT FROM AUTHOR]