Curing and properties of urethane acrylates with different functionalities under electron-beam and ultraviolet irradiation

•A series of urethane acrylates with different functionalities were synthesized.•The difference in curing process under energy-equivalent EB or UV irradiation was investigated.•The effect of functionality on curing degree and properties of the cured materials was revealed.•The difference in curing m...

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Bibliographic Details
Published in:Progress in organic coatings 2021-07, Vol.156, p.106252, Article 106252
Main Authors: Liu, Pengfei, Zhu, Junzhe, Cheng, Lin, Liu, Xiaoya, Liu, Ren
Format: Article
Language:English
Subjects:
Acrylates
Curing
Electron beams
Electron-beam (EB) curing
Equivalence
Glass transition temperature
Infrared spectroscopy
Irradiation
Liquid chromatography
Multifunctional acrylate
NMR spectroscopy
Spectrum analysis
Superposition (mathematics)
Ultraviolet (UV) curing
Ultraviolet radiation
Urethane acrylate
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Summary:•A series of urethane acrylates with different functionalities were synthesized.•The difference in curing process under energy-equivalent EB or UV irradiation was investigated.•The effect of functionality on curing degree and properties of the cured materials was revealed.•The difference in curing mechanism between EB and UV was clarified. In this study, four model urethane acrylates with different functionalities were synthesized and their structures were characterized using infrared spectroscopy, nuclear magnetic resonance spectroscopy, and gel permeation chromatography. Pure urethane acrylates were then irradiated with energy-equivalent electron-beam (EB) and ultraviolet (UV), and the acrylate structure and curing degree after irradiation were studied. The results of double bond conversion and gel content revealed that the curing degree of EB-cured samples was higher than that of UV-cured samples under equivalent energy. Furthermore, the energy supply mode was changed from one-time to multiple superimposition, which clarified that the in situ polymerization effect of EB irradiation could produce a high curing degree. Finally, pure urethane acrylates were mixed with commercial oligomer, and the glass transition temperature and pendulum hardness of the cured products were investigated. Moreover, the performance of cured films and coatings was affected by multiple factors, such as functionality, irradiation type and energy supply mode.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2021.106252