Exploring the Morphology and Mechanical Properties of Benzotriazole Derivatives Hybridized Polyurethane Composites
CHANG Jiang1,2
1 College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001 2 College of Light Industry and Textile Engineering, Qiqihar University, Qiqihar 161006
Abstract: This paper presented the study on the micro-morphology and mechanical properties of benzotriazole small molecule UV-329 hybridized polyether polyurethane (TPU) composites. TPU/UV-329 composites with various proportion (10%, 20%, 25%, 30%, 40%, 50%, 60%, mass fraction) of UV-329 were prepared. Scanning electron microscope (SEM) and Fourier transform infrared spectroscope (FTIR) were employed to characterize the micro-morphology and structure of TPU/UV-329 composites, and their mechanical properties of the composites were tested by universal material testing machine. As could be seen from the results, there was no obvious phase separation in the microstructure of composites with low UV-329 contents by micro-morphology observation, while phase separation occurred in the microstructure of composites with high UV-329 contents. Additionally, the reduction of polyurethane proportion induced the gradual migration of a large number of UV-329 molecular monomers to the surface layer of the cross section, which indicated the miscible state of most UV-329 molecular monomers in the matrix, damaging the continuity of the matrix. As regard to the mechanical properties, the tensile test of the composite demonstrated the accordance of the tensile properties to Payne effect, namely, UV-329 was capable of improving the elastic modulus and strength of the composites at low strain, and enhancing the plastic behavior of the composites at high strain.
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2019, Vol. 33 
