Title
The change of the properties of acrylic-based polyurethane via addition of nano-silica
Document Type
Article
Publication Date
2002
Department/School
Physics and Astronomy
Abstract
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.
Link to Published Version
Recommended Citation
Zhou, S. X., Wu, L. M., Sun, J., & Shen, W. D. (2002). The change of the properties of acrylic-based polyurethane via addition of nano-silica. Progress in Organic Coatings, 45(1), 33–42. doi:10.1016/S0300-9440(02)00085-1