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Preparation of Novel Hydrolyzing Urethane Modified Thiol-Ene Networks
Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive, Hattiesburg, MS 39406, USA
Chemistry Division, Naval Research Laboratory, 4555 Overlook Ave, SW, Washington, DC 20375, USA
J. Paige Buchanan was formerly known as J. Paige Phillips.
* Author to whom correspondence should be addressed.
Received: 11 August 2011; in revised form: 6 October 2011 / Accepted: 21 October 2011 / Published: 25 October 2011
Abstract: Novel tetra-functional hydrolyzing monomers were prepared from the reaction of TEOS and select alkene-containing alcohols, ethylene glycol vinyl ether or 2-allyloxy ethanol, and combined with trimethylolpropane tris(3-mercaptopropionate) (tri-thiol) in a thiol-ene “click” polymerization reaction to produce clear, colorless thiol-ene networks using both radiation and thermal-cure techniques. These networks were characterized for various mechanical characteristics, and found to posses Tg’s (DSC), hardness, tack, and thermal stability (TGA) consistent with their molecular structures. A new ene-modified urethane oligomer was prepared based on the aliphatic polyisocyanate Desmodur® N 3600 and added to the thiol-ene hydrolyzable network series in increasing amounts, creating a phase-segregated material having two Tg’s. An increase in water absorption in the ene-modified urethane formulations leading to a simultaneous increase in the rate of hydrolysis was supported by TGA data, film hardness measurements, and an NMR study of closely related networks. This phenomenon was attributed to the additional hydrogen bonding elements and polar functionality brought to the film with the addition of the urethane segment. SEM was utilized for visual analysis of topographical changes in the film’s surface upon hydrolysis and provides support for surface-driven erosion. Coatings prepared in this study are intended for use as hydrolyzing networks for marine coatings to protect against ship fouling.
Keywords: hydrolysis; thiol-ene; click chemistry; urethane
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MDPI and ACS Style
Mackey, N.M.; Confait, B.S.; Wynne, J.H.; Buchanan, J.P. Preparation of Novel Hydrolyzing Urethane Modified Thiol-Ene Networks. Polymers 2011, 3, 1849-1865.
Mackey NM, Confait BS, Wynne JH, Buchanan JP. Preparation of Novel Hydrolyzing Urethane Modified Thiol-Ene Networks. Polymers. 2011; 3(4):1849-1865.
Mackey, Nicole M.; Confait, Bridget S.; Wynne, James H.; Buchanan, J. Paige. 2011. "Preparation of Novel Hydrolyzing Urethane Modified Thiol-Ene Networks." Polymers 3, no. 4: 1849-1865.