Abstract
The elimination of mercury, low energy consumption, and low heat make the ultraviolet light-emitting diode (UV-LED) system emerge as a promising alternative to conventional UV-mercury radiation coating. Hence, a series of hydrophobic coatings based on urethane acrylate oligomer and fluorinated monomer via UV-LED photopolymerisation was designed in this paper. The presence of fluorine component at 1160 cm−1, 1235 cm−1, and 1296 cm−1 was confirmed by Fourier Transform Infra-Red spectroscopy. A considerably high degree C=C conversion (96–98%) and gel fraction (95–93%) verified the application of UV-LED as a new technique in radiation coating. It is well-accepted that fluorinated monomer can change the surface wettability as the water contact angle of the coating evolved from 88.4° to 121.2°, which, in turn, reduced its surface free energy by 70.5%. Hence, the hydrophobicity of the coating was governed by the migration of the fluorine component to the coating surface as validated by scanning electron and atomic force microscopies. However, above 4 phr of fluorinated monomer, the transparency of the cured coating examined by UV-visible spectroscopy experienced approximately a 16% reduction. In summary, the utilisation of UV-LED was a great initiative to develop green aspect in photopolymerisation, particularly in coating technology.
Highlights
Hydrophobicity is one of the surface properties that has been enthusiastically explored by researchers [1,2,3,4,5,6,7,8,9,10]
The fluorinated polyurethane acrylate or FPUA coating was prepared with different content of HDFDMA at ambient temperature (25–27 ◦C)
The poor compatibility of the HDFDMA and the urethane acrylate oligomer was caused by their dissimilar property behaviour
Summary
Hydrophobicity is one of the surface properties that has been enthusiastically explored by researchers [1,2,3,4,5,6,7,8,9,10]. With the water contact angle exceeding 90◦, the hydrophobic surface is water-repelling and delivers captivating uses such as anti-fouling, anti-icing, anti-corrosion, and self-cleaning effects [11,12,13] This appealing feature has been a matter of interest in various sectors, including automotive, textile industry, and optical devices. It has been well-recognized that fluorinated polymer has outstanding and distinctive properties due to the unique nature of fluorine atom Their uniqueness includes high thermal, chemical, and weather resistance, low refractive index, low dielectric constant, and high inertness towards moisture adsorption, as well as interesting water and oil repellence [15,16,17,18,19,20,21]. Due to these reasons, fluorinated materials can be applied in wide range of applications such as chemical resistance coating, non-corrosive materials, anti-fouling coating, and as an interlayer dielectric [15,16,17,19]
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