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Two-photon photopolymerization using novel asymmetric ketocoumarin derivatives

Paper ID Volume ID Publish Year Pages File Format Full-Text
28139 44061 2007 7 PDF Available
Title
Two-photon photopolymerization using novel asymmetric ketocoumarin derivatives
Abstract

A series of stilbene modified asymmetric ketocoumarin derivatives (compounds 1–4) with varied electron-donating terminal groups used on two-photon photopolymerization were reported. Solvatochromism analysis showed that the compounds with strong electron-donating terminal groups exhibited larger dipole moment change than those with weak electron-donating groups upon excitation. In addition, these compounds with strong electron-donating groups presented excellent two-photon absorption properties. Their two-photon absorption cross-sections are two magnitudes larger than those of common UV–vis sensitive photosensitizers. The results of photobleaching and one-photon polymerization experiments also showed that these compounds had high photoactivity on photosensitized photolysis of o-chloro hexaarylbiimidazoles (o-Cl-HABI) and 4,4′-dimethyldiphenyliodinium hexafluorophosphate (DPI) to generate radicals. As an example, the combination of compound 4 with o-Cl-HABI, an efficient two-photon photopolymerization initiation system, has been preliminarily demonstrated for fabrication of 3D micro-structures.

Keywords
Two-photon absorption; Two-photon photopolymerization; Ketocoumarin
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Two-photon photopolymerization using novel asymmetric ketocoumarin derivatives
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 190, Issue 1, 5 July 2007, Pages 22–28
Authors
, , , , ,
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
100% Money Back Guarantee
Full-text PDF Download
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