S. L. Qiu, S. Y. Li, Y. J. Tao, X. M. Feng, B. Yu, X. W. Mu, W. Y. Xing, Y. Hu and G. X. Jie (2015) Preparation of UV-curable functionalized phosphazene-containing nanotube/polyurethane acrylate nanocomposite coatings with enhanced thermal and mechanical properties. Journal/Rsc Advances 5 73775-73782. [In English]
Web link: http://dx.doi.org/10.1039/c5ra12264c
Keywords: PRECIPITATION POLYMERIZATION, POLYPHOSPHAZENE MICROSPHERES, WATERBORNE, POLYURETHANE, PHYSICAL-PROPERTIES, TEMPLATE APPROACH, FACILE SYNTHESIS, METHYLENE-BLUE, HYBRID, STABILITY, NANOTUBES
Abstract: Poly(cyclotriphosphazene-co-4,4'-sulfonyldiphenol) (PZS) nanotubes with active hydroxyl groups were fabricated via an in situ template method under mild conditions, and then modified by acryloyl chloride to obtain the acryloyl-group functionalized PZS (f-PZS) nanotubes. The structure of the PZS nanotubes was characterized by Fourier transform infrared spectroscopy and the morphology was investigated by scanning electron microscopy and transmission electron microscopy. The f-PZS/polyurethane acrylate (f-PZS/PUA) nanocomposite coatings were prepared by UV radiation technology to covalently introduce f-PZS nanotubes into a PUA matrix. Dynamic mechanical analysis and tensile tests were performed to characterize the mechanical properties of the f-PZS/PUA nanocomposite coatings. The optimal reinforcing effect for the PUA matrix was observed when the content of f-PZS nanotubes was 3.0 wt%. The thermal stability of the PUA nanocomposites was studied by thermo gravimetric analysis. It indicates that the onset thermal degradation temperature of the f-PZS/PUA nanocomposites with 1.0 wt% f-PZS nanotubes is increased by 36.3 degrees C. These remarkable property reinforcements are attributed to the covalent functionalization of PZS nanotubes, which can effectively improve the interfacial interaction between the f-PZS nanotubes and the PUA matrix.

 ,