Preparation, characterization, and properties of environmentally friendly waterborne poly(urethane acrylate)/silica hybrids

Abstract

A series of environmentally friendly waterborne poly(urethane acrylate) (WPUA)/silica (SiO 2 ) hybrids were synthesized by a sol-gel process on the basis of isophorone diisocyanate, polyester polyol (GE-210), dimethylpropionic acid, butyl acrylate and methyl methacrylate monomers, tetraethoxysilane (TEOS), and 3-glycidyloxypropyl trimethoxysilane (GLYMO) as a coupling agent. The mechanical properties of the WPUA/SiO 2 hybrids were investigated through tensile and hardness tests. Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, atomic force microscopy, and X-ray diffraction were used to assess the fracture surface morphology and the dispersions of the WPUA/SiO 2 hybrids. The strength and hardness values of the WPUA/SiO 2 hybrids were improved significantly. This was attributed to the synergistic effect of WPUA, GLYMO, and TEOS. The results show that SiO 2 particles of the membranes had a uniform dispersion and formed an excellent interfacial bonding layer on their surfaces. The prepared hybrids showed good thermal stability and mechanical properties in comparison with pure WPUA and showed tunable transparence with the SiO 2 fraction in the film. Through suitable adjustment of the TEOS content, some thin hybrids have potential applications as specialty materials.

Waterborne polyurethane/inorganic hybrid composites: preparation, morphology and properties

“…Such a surface morphology enhanced the water and friction resistances. 23 Thermal properties of WPU and WPU/TiO 2 composites Figure 10 shows the DSC scan curves for the WPU and WPU/TiO 2 hybrid composites. The WPU/TiO 2 hybrid composites had a higher glass transition temperature T g of hard segment than the pure WPU.…”

Preparation and characterization of waterborne polyurethane containing PET waste/PPG as soft segment

“…While a wide variety of properties known from polyurethane chemistry and technology is also achievable from an aqueous medium, WPUs have properties that are very close to solvent‐borne polyurethanes. Furthermore, WPU possesses superior properties such as abrasion resistance, high flexibility at low temperature, excellent adhesion to glass surfaces and film‐forming ability at ambient temperature, which leads to continuously increasing applications in many fields including coating, printing, ink, adhesive and fibre processing…”

Triazole-forming waterborne polyurethane composites fabricated with silane coupling agent functionalized nano-silica

“…However, the hardness of CWPU films was constant from WPUi3 to WPUi5. This may be due to the excessive nano-silica in CWPU that led to nonuniform dispersion, and did no help to the formation of IPN [26].…”

“…This modification was more efficient than conventional methods which by reactions between hydroxyls existing in SiO 2 and isocyanate groups [22][23][24][25][26].…”