UV-LED as a new emerging tool for curable polyurethane acrylate hydrophobic coating

Ghazali, Siti Khairunisah and Adrus, Nadia and A. Majid, Rohah and Ali, Fathilah and Jamaluddin, Jamarosliza (2021) UV-LED as a new emerging tool for curable polyurethane acrylate hydrophobic coating. Polymers, 13 (4). p. 487. ISSN 2073-4360

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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

Item Type:	Article (Journal)
Additional Information:	5439/89482
Uncontrolled Keywords:	UV-LED; fluorinated polyurethane acrylate; surface properties
Subjects:	T Technology > TP Chemical technology > TP1080 Polymers, plastics and their manufacture
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering Kulliyyah of Engineering > Department of Biotechnology Engineering
Depositing User:	Dr Fathilah Ali
Date Deposited:	22 Apr 2021 10:08
Last Modified:	07 Jul 2021 15:18
URI:	http://irep.iium.edu.my/id/eprint/89482

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