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Issue 78, 2016

Squaric acid derivative effects on the kinetics of photopolymerization of different monomers

Author affiliations

Abstract

Systems composed of 1,3-bis(phenylamino)squaraine (photosensitizer) and conventional free radical sources, such as tetramethylammonium n-butyltriphenylborate, diphenyliodonium chloride and diphenyliodonium hexafluorophosphate were used for initiation of photopolymerization occurring via a radical or cationic mechanism. The photopolymerization of 1,6-hexanediol diacrylate (HDDA), pentaerythritol triacrylate (PETA), 2-ethyl-2-(hydroxymethyl)-1,3-propanediol triacrylate (TMPTA), cyclohexene oxide (CHO) and 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate (EPOX) were carried out at 300 nm < λ < 500 nm irradiation. The polymerization kinetics was measured using a differential scanning calorimeter equipped with a high-pressure mercury lamp. The effect of co-initiator structure and type of monomer on the kinetics of the photopolymerization process is also presented here. It was found that the photoredox pairs, consisting of 1,3-bis(phenylamino)squaraine and tetramethylammonium n-butyltriphenylborate or diphenyliodonium salts, initiate radical and cationic polymerization in the UV-Vis light region. The photoinitiating ability of these new photoinitiating systems acting in the UV-Vis light region for initiation of polymerization of acrylates and epoxides was compared with a few commercially used photoinitiating systems.

Graphical abstract: Squaric acid derivative effects on the kinetics of photopolymerization of different monomers

Article information


Submitted
08 Jul 2016
Accepted
14 Jul 2016
First published
15 Jul 2016

RSC Adv., 2016,6, 74715-74725
Article type
Paper

Squaric acid derivative effects on the kinetics of photopolymerization of different monomers

J. Kabatc, K. Kostrzewska and K. Jurek, RSC Adv., 2016, 6, 74715 DOI: 10.1039/C6RA17533C

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