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Thursday, 19 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Synthesising waterborne polyurethane-acrylate with core-shell structure

Monday, 9 June 2014

Crosslinking core-shell emulsions of waterborne fluorinated polyurethane-acrylate (WFPUA) were successfully synthesised using a solvent-free method.

Scientists synthesised crosslinking core-shell emulsions of waterborne fluorinated polyurethane-acrylate 
Source: Dmitriy K.L - Fotolia.com

Scientists synthesised crosslinking core-shell emulsions of waterborne fluorinated polyurethane-acrylate
Source: Dmitriy K.L - Fotolia.com

The crosslinkers of diacetone acrylamide and adipic dihydride were introduced into the WFPUA emulsions by Chinese researchers. They characterised physical properties of hybrid emulsions such as the average particle size, stability, and viscosity. The core-shell of crosslinking WFPUA emulsion synthesised was observed by transmission electron microscopy.

Fluorinated monomer had been polymerised

The results of Fourier transform infrared spectroscopy, atomic force microscopy, and X-ray photoelectron spectroscopy indicated that the fluorinated monomer (FA) had been polymerised into the crosslinking waterborne polyurethane-acrylate polymer, and the fluorinated groups have evident enrichment on the film-air surface with the increase of FA content. At the same time, the thermal properties, water repellent/antifouling properties, and mechanical properties were measured. Moreover, the thermal properties and the elongation are raised but tensile stress and shore hardness are decreased with the increase of FA content.

The study is published in: Journal of Applied Polymer Science.

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