1 April 2015 Effect of particle size on the properties of polyurea-based composites
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Polyurea is a type of elastomer with excellent properties and a myriad of applications. Especially, the application in increasing the survivability of structures and buildings under impact loading is more attractive. Recently, modifying the properties of polyurea by mixing micro and nano particles into polyurea is becoming a new research hotspot. However, systematic study of the effect of particles size on the properties of polyurea-based composites has not been reported. Hence, in our present work, glass beads with diameters in the range from 3μm to 250μm were selected and composites with 20% volume fraction of glass beads were prepared. Microstructure of the composites was investigated by Scanning Electron Microscopy (SEM). Dynamic mechanical analysis was conducted using a TA Instruments DMA 2980 over the temperature range from -80°C to 50°C at various frequencies. The storage and loss moduli master curves for these composites were obtained through application of the time-temperature superposition (TTS). Ultrasonic properties were determined by a personal computer (PC) based ultrasonic system at room temperatures. Velocity and attenuation of longitudinal ultrasonic wave were measured. Consequently, complex longitudinal modulus was computed from these measurements. Evaluation of the effect of particle size on the properties of the composites mentioned above was presented.
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Jing Qiao, Jing Qiao, Alireza V. Amirkhizi, Alireza V. Amirkhizi, Sia Nemat-Nasser, Sia Nemat-Nasser, "Effect of particle size on the properties of polyurea-based composites", Proc. SPIE 9432, Behavior and Mechanics of Multifunctional Materials and Composites 2015, 94320R (1 April 2015); doi: 10.1117/12.2084483; https://doi.org/10.1117/12.2084483

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