Hybrid organic/inorganic coatings produced using a dual-cure mechanism |
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| Authors: | Jie He Bret J. Chisholm Bret A. Mayo Hanzhen Bao Jared Risan David A. Christianson Crystal L. Rafferty |
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| Affiliation: | 1. The Center for Nanoscale Science and Engineering, North Dakota State University, 1735 Research Park Drive, Fargo, ND, 58102, USA
2. Department of Coatings and Polymeric Materials, North Dakota State University, 1735 Research Park Drive, Fargo, ND, 58102, USA
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| Abstract: | A coating precursor containing both acrylate functionality and trimethoxysilane functionality was produced by reacting bisphenol-A glycerolate diacrylate with 3-isocyanatopropyltimethoxysilane. With this precursor, two different crosslinked networks can be produced. A polyacrylate network can be produced using a radiation-cure mechanism while a polysiloxane network can be produced by hydrolysis and condensation reactions involving the trimethoxysilane groups. The objective of the study was to determine the utility of this dual-cure system for generating rapid-cure coatings for corrosion protection. Coating properties were determined as a function of cure conditions. The results of the study showed that the formation of siloxane crosslinks was significantly hindered by the crosslinked network induced by the UV-curing process. Even though the overall conversion of trimethoxysilane groups to siloxane crosslinks was relatively low, coating barrier properties were significantly enhanced and coating free volume reduced. At ambient conditions, additional crosslinking occurring through siloxane bond formation increased within the first 4 days after UV-curing. Beyond this period, siloxane bond formation remained unchanged as did coating properties. |
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