Journal
PROGRESS IN ORGANIC COATINGS
Volume 90, Issue -, Pages 21-27Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2015.09.004
Keywords
Thiol-ene click reaction; UV-curable coating; Thermal degradation; Trithiol; Diene
Funding
- National Natural Science Foundation of China [51373200, 51573210]
- Program for New Century-Talents in Universities [NCET-13-1049]
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Thiol-ene click reaction is an efficient method for the rapid production of films with desirable properties. Compared with common UV-curing techniques, it largely eliminates the problem of oxygen inhibition and is of inherent low internal stress. In this work, two phosphorous-containing diene monomers and one nitrogen-containing trithiol monomer were designed and synthesized. The UV-curing reaction kinetics of the different ene groups (allyl ether, acrylate, and methacrylate) with the thiol group were studied using real-time FTIR. The competition between the thiol-ene free radical polymerization and homopolymerization of the C=C double bond were evaluated and tuned by varying the ratio of the ene and thiol functionalities. Highly cross-linked coating with excellent hardness, adhesion and flexibility are obtained as a result of the high efficiency of thiol-ene click reaction and its inherent low internal stress, as well as the incorporation of hetero-atoms P and N to the polymer back bone. The incorporation of phosphorous and nitrogen to the system also improved the flame retardancy of the film due to a positive phosphorous-nitrogen synergistic action. (C) 2015 Elsevier B.V. All rights reserved.
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