939985-76-9Relevant academic research and scientific papers
Photo-cross-linking of polymethacrylates with stilbene chromophores in the side chains
Jahnke, Angelika,Beile, Bernhard,Meier, Herbert
, p. 2111 - 2124 (2012/01/31)
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 [2π+2π] 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. Copyright
