Journal
PROGRESS IN ORGANIC COATINGS
Volume 112, Issue -, Pages 1-8Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2017.06.024
Keywords
Cationic photopolymerization; UV polymerization; Epoxy groups conversion; Iodonium salt; Sulfonium salt; Photoinitiator
Funding
- National Centre for Research and Development (NCBiR, Poland) [LIDER/16/181/L-3/11/NCBR/2012]
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Epoxy binder based on 3,4-epoxycyclohexylmethyl-3',4'-epoxycyclohexanecarboxylate (EEC) and poly-tetrahydrofurane diglycidyl ether (PTHDE) was cured using four types of commercial cationic UV-photoinitiators (two iodonium salts and two sulfonium salts) and a medium-pressure mercury lamp. Influence of a type of photoinitiator on thermal, optical, mechanical and barrier features of the varnish coatings was investigated. Moreover, conversion of cycloaliphatic epoxy (CC) and glycidyl (GC) groups was analyzed. Generally, systems containing iodonium or sulfonium hexafluorophosphates exhibited higher GC, gel content, gloss and water vapor transmission rate as well as lower yellowness and hardness than samples based on SbF6--type salts. Photoinitiator type did not significantly affect CC parameter, however, application of the iodonium salts mixtures influenced on CC as well as GC, thermal features and gloss of epoxy varnishes and coatings.
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