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Polymerization of HEMA photoinitiated by the Safranine/diphenylborinate system ☆

Paper ID Volume ID Publish Year Pages File Format Full-Text
26651 43969 2013 7 PDF Available
Title
Polymerization of HEMA photoinitiated by the Safranine/diphenylborinate system ☆
Abstract

The photoinitiator system Safranine/2-ethylaminodiphenylborinate (Sf/2APB) was used to polymerize HEMA and the kinetics of the reaction were followed by isothermal photocalorimetry. The active initiating radical is 2APB−, arising from the reaction of triplet Safranine with 2APB. The formation of a semioxidized form of Sf leads to photobleaching of the dye, which occurs with the same rate as polymerization, indicating that both species are formed simultaneously. When adding diphenyliodonium chloride (DPIC) to the photoinitiating mixture the polymerization rate is accelerated due to the reaction of the 2APB− radical ion with DPIC to form Ph radicals. These radicals are about 7 times more efficient for polymerization than the boron centered radicals. Photobleaching of the dye is also inhibited by the addition of DPIC.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► 2-Ethylaminodiphenylborinate (2APB) was used together with Safranine to induce photopolymerization of HEMA. ► The polymerization is initiated by boron-centered radical anions. ► Addition of diphenyliodide chloride (DPIC) to the initiating system improved polymerization. ► Phenyl radicals formed by the reaction of the boron radical with DPIC are 7 times more efficient as initiators than the former.

Keywords
Free-radical photopolymerization; 2-Ethylaminodiphenyl borinate; Boron centered radicals
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Polymerization of HEMA photoinitiated by the Safranine/diphenylborinate system ☆
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 252, 15 January 2013, Pages 124–130
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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Any Questions? feel free to contact us