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Photosensitized isomerization of olefin with benzophenone-conjugated amphiphilic graft copolymers

Paper ID Volume ID Publish Year Pages File Format Full-Text
27629 44033 2010 7 PDF Available
Title
Photosensitized isomerization of olefin with benzophenone-conjugated amphiphilic graft copolymers
Abstract

Two kinds of amphiphilic graft copolymers, PAA-g-P(MMA-co-BP) and P(AA-co-BP)-g-PMMA, consisting of polar poly(acrylic acid) (PAA), less polar poly(methyl methacrylate) (PMMA), and benzophenone (BP) photosensitizing units, have been synthesized. These polymers, when used as a photosensitizer for isomerization of trans-β-methylstyrene, show a sensitization activity controlled by solvents. In benzene and chloroform, P(AA-co-BP)-g-PMMA forms a micelle structure consisting of aggregated P(AA-co-BP) core with dissolved PMMA units at the outer sphere. This suppresses a triplet energy transfer (TET) from the excited state BP units to olefin and, hence, shows lower sensitization activity than a bulk sensitizer (4-methoxybenzophenone: MBP). In methanol, both polymers form a weak aggregate of less polar PMMA units containing dissolved PAA units. The internal cavity of the aggregate is less polar and stabilizes the excited state BP units. This accelerates a TET from the excited state BP units to olefin and shows higher sensitization activity than MBP.

Graphical abstractAmphiphilic graft copolymers containing a benzophenone photosensitizing unit show a sensitization activity controlled by solvents due to the change in polymer structure in different solvents.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Amphiphilic polymer; Graft copolymer; Photosensitizer; Photoisomerization; Olefin
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Photosensitized isomerization of olefin with benzophenone-conjugated amphiphilic graft copolymers
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 213, Issue 1, 10 June 2010, Pages 80–86
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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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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Any Questions? feel free to contact us