Hybrid organic–inorganic macromolecular photoinitiator system for visible-light photopolymerization
•Amino-functionalized macromolecular photoinitiator for visible-light was synthesized.•Hybrid organic–inorganic photoinitiator (OI-AH) was synthesized by sol–gel process.•Hydrolytic condensation of amino-functionalized silane resulted in bulky OI-AH.•The camphorquinone/OI-AH pair is very attractive...
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Published in | Progress in organic coatings Vol. 77; no. 11; pp. 1848 - 1853 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.11.2014
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Subjects | |
Online Access | Get full text |
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Summary: | •Amino-functionalized macromolecular photoinitiator for visible-light was synthesized.•Hybrid organic–inorganic photoinitiator (OI-AH) was synthesized by sol–gel process.•Hydrolytic condensation of amino-functionalized silane resulted in bulky OI-AH.•The camphorquinone/OI-AH pair is very attractive for polymerization of methacrylates.
Hybrid organic–inorganic macrophotoinitiator bearing pendant tertiary amine groups (OI-AH) was prepared by hydrolytic condensation of a silane containing amino groups. The macromolecular amino-functionalized photoinitiator was used in combination with camphorquinone (CQ) for visible-light photo-polymerization. The OI-AH was incorporated into methacrylate resins at loadings between 1 and 10wt.%. The photodecomposition of the CQ/OI-AH in methacrylate monomers under visible light irradiation (λ=470nm) was examined. The photolysis products of CQ/OI-AH were transparent at the irradiating wavelengths; consequently, the consumption of the CQ is accompanied by increased light intensity in the underlying lays. The clean and rapid photobleaching of CQ in combination with OI-AH makes this photoinitiator system very attractive for polymerization of thick sections. The evolution of monomer conversion versus irradiation time showed that the OI-AH is an efficient co-initiator of CQ because a fast reaction and high conversion of methacrylate groups result after 60s irradiation with a LED source of 140mW. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0300-9440 1873-331X |
DOI: | 10.1016/j.porgcoat.2014.06.010 |