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The study of the polymerization of hybrid systems
Authors: Škola Ondřej | Jašúrek Bohumil | Vališ Jan | Němec Petr
Year: 2014
Type of publication: ostatní - článek ve sborníku
Name of source: Proceedings – The Seventh International Symposium GRID 2014
Publisher name: Univerzitet u Novom Sadu
Place: Novi Sad
Page from-to: 59-63
Titles:
Language Name Abstract Keywords
eng The study of the polymerization of hybrid systems Nowadays, UV curable systems (inks, varnishes) are frequently used in printing industry. These systems can be classified according to the type of polymerization reactions as free radical and cationic. In the majority, UV inks and varnishes are based on free radical polymerization. This type of polymerization is characterized by very fast curing (fraction of seconds). On the other hand, the inhibition by atmospheric oxygen and worse adhesion of cured films to polymeric or metallic foils are the disadvantages of free radical polymerizations. Cationic polymerization is not as fast as free radical polymerization and the final properties of a cured film are obtainable approximately after 24 hours. Cationic systems aren´t inhibited by atmospheric oxygen and cured films have very good adhesion to various substrates. Disadvantage of cationic systems is their inhibition by air humidity and basic substances. Hybrid UV systems are simultaneously cured by free radical and cationic polymerization. Hybrid systems have lower sensitivity to inhibition by atmospheric oxygen and air humidity, thus the final film properties could be much better than those of systems cured by only free radical or cationic polymerization. The aim of this work was to study the polymerization reaction of hybrid systems and to compare them with systems polymerizing by only free radical or cationic polymerization. Hybrid systems were prepared from photoinitiators: Darocure 1173 (free radical photoinitiator) and Irgacure 250 (cationic photoinitiator), and monomers: pentaerythritol triacrylate (free radical polymerization) and Uvacure 1500 (epoxyde monomer, cationic polymerization). The molar ratio of monomers in hybrid systems was 1:1, 1:3 and 3:1. Concentration of photoinitiator was 3 mol% in all cases. The degree of conversion was evaluated based on results obtained from FTIR spectroscopy. radical polymerization, cationic polymerization, hybrid polymerization

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