X. D. Qian, L. Song, B. B. Wang, Y. Hu and R. K. K. Yuen (2013) Synthesis of organophosphorus modified nanoparticles and their reinforcements on the fire safety and mechanical properties of polyurea. Journal/Materials Chemistry And Physics 139 443-449. [In English]
Web link: http://dx.doi.org/10.1016/j.matchemphys.2013.01.018
Keywords: Composite materials, Mechanical properties, Thermal properties, Sol-gel, growth, THERMAL-PROPERTIES, FLAME RETARDANCY, EPOXY-RESIN, SOL-GEL, PHOSPHORUS, NANOCOMPOSITES, POLYMERS, FLAMMABILITY, COMPOSITES, CHEMISTRY
Abstract: Novel organophosphorus modified nanoparticles (FRs-nanoparticles) were synthesized by the hydrolysis and condensation of both 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide modified vinyl trimethoxy silane (DOPO-VTS) and 3-triethoxysilylpropylamine. FRs-nanoparticles were incorporated into the polyurea matrix in different ratios via in situ polymerization, resulting in the formation of organic/inorganic nanocomposites. The nanocomposites were characterized by thermogravimetric analysis (TGA), real-time fourier transform infrared spectra (RTIR), microscale combustion calorimeter (MCC) and tensile testing machine. The TGA results revealed that FRs-nanoparticles could slightly catalyze the thermal degradation of the nanocomposites in nitrogen atmosphere, but significantly improve the thermal stability of the nanocomposites in air atmosphere. The T-0.5 (50wt.% weight loss) of the nanocomposites was delayed by 32 degrees C in air atmosphere. Moreover, the char yield increased from 23wt.% to 8.9 wt.% at 550 degrees C when the loadings of FRs-nanoparticles was 10wt.%, indicating the catalyzing charring effect of FRs-nanoparticles. The MCC results revealed that all the nanocomposites exhibited much lower flammability compared with virgin polyurea. Furthermore, the tensile test indicated that the FRs-nanoparticles could also improve the mechanical properties of polyurea. (C) 2013 Elsevier B.V. All rights reserved.

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