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Photo-Cross-Linking of Polymethacrylates with Stilbene Chromophores in the Side Chains

✍ Scribed by Angelika Jahnke; Bernhard Beile; Herbert Meier

Publisher
John Wiley and Sons
Year
2011
Tongue
German
Weight
255 KB
Volume
94
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

Methacrylates (=2‐methylpropenoates) 5 with (E)‐stilbene (=(E)‐1,2‐diphenylethene) building blocks on tethers of variable length were prepared (Scheme 2) and polymerized (i.e., 5→6; Scheme 3) in the presence of AIBN (=2,2′‐azobis(2‐methylpropanenitrile). 4‐[(E)‐2‐Phenylethenyl]phenyl acetate (7) as model compound established the cyclodimerization as a single irreversible photoreaction. i.e., (7→8–11; Scheme 4) in the absence of oxygen. The solution photolysis of the polymers 6 provided a similar result, whereby [2__π__+2__π__] cycloadditions of stilbene units of neighboring tethers predominated. On the contrary, the desired photo‐cross‐linking of chaines occurred in the irradiation of polymer films.

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