The change of the properties of acrylic-based polyurethane via addition of nano-silica

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Physics and Astronomy


Acrylic-based polyurethane coatings with nano-silica particles embedded were prepared. The compositions at the surfaces and at the interfaces with substrates were investigated by X-ray photoelectron spectrometer (XPS). The mechanical and optical properties of the coatings were studied intensively by using pendulum hardness tester, Nano-Indenter XP, Instron testing machine, dynamic mechanical analyzer (DMA), transmission electron micrograph (TEM), and UV-Vis spectrophotometer. The coatings with fumed silica and micro-silica embedded were also investigated for comparison with the coatings containing nano-silica. The results showed that silica element neither existed at the surfaces nor existed at the interfaces of the coatings with nano-silica or micro-silica embedded, and the silicon atoms intend to reside inside the coatings. The macro-hardness, micro-hardness, abrasion resistance, and scratch resistance were apparently improved via addition of nano-silica. The tensile strength and Young's modulus were also enhanced with the increasing content of nano-silica: However, the elongation at break decreased as nano-silica content increased. The UV absorbance in the wavelength of 290-400nm increased as nano-SiO2 content increased. In contrast, for the polyurethane coatings with fumed silica or micro-silica embedded, only hardness and abrasion resistance showed some increase. (C) 2002 Elsevier Science B.V. All rights reserved.

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