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Thursday, 19 September 2019
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Raw materials & technologies, Technologies, UV/EB Coatings

Modifying UV curable acrylic copolymers with a novel macromonomer

Wednesday, 25 November 2015

Chinese researchers have developed a novel macromonomer that is effective to modify the properties of UV-curable coatings.

A mono-methacryloyloxy terminated fluorinated macromonomer was used for the modification of UV curable acrylic copolymers. Source: Uta Herbert/pixelio.de
A mono-methacryloyloxy terminated fluorinated macromonomer was used for the modification of UV curable acrylic copolymers. Source: Uta Herbert/pixe...

They synthesised the macromonomer containing fluorinated units (PHFBMA-GMA) through a two-step procedure: firstly, hexafluoro-butyl methacrylate (HFBMA) was polymerised in the presence of functional chain transfer agent 3-mercaptopropionic acid (MPA) and then the carboxyl acid group terminated polymer was end-capped with glycidyl methacrylate (GMA). Chemical structures of PHFBMA-GMA were characterised by gel permeation chromatography, fourier transform infrared spectroscopy (FTIR), and 1H nuclear magnetic resonance (NMR). Subsequently, PHFBMA-GMA was employed as reactive surface additives added into UV-cured polyacrylate to modify UV-curable coatings.

Enrichment of fluorinate atoms on the surface

It is convenient to control the tail length of the fluorinated segments by adjusting the ratio of initiator and chain transfer agent. The influence of both the concentration and the molecular weight of PHFBMA-GMA on the surface properties of UV-cured films was investigated. With increasing the concentration and the molecular weight of PHFBMA-GMA, the surface energy of the UV-cured films decreased. X-ray photoelectron spectroscopy was employed to characterise and quantify the surface composition and the results confirmed the enrichment of fluorinate atoms on the surface. Moreover, the physical properties of UV-cured films, such as adhesion, chemical resistance, mechanical and thermal properties, were also investigated. The novel macromonomer was economical but effective to modify the properties of the UV-curable coatings.

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

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