Photo-Cross-Linking of Polymethacrylates with Stilbene Chromophores in the Side Chains
作者:Angelika Jahnke、Bernhard Beile、Herbert Meier
DOI:10.1002/hlca.201100252
日期:2011.12
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;
甲基丙烯酸酯(= 2- methylpropenoates)5与(ë) -芪(=(Ë)-1,2-二苯基乙烯)基础上制备的可变长度的系绳块(方案2)和聚合(即,5 → 6 ;方案3)在AIBN的存在(= 2,2'-偶氮二(2-甲基丙腈)4 - [(ë)-2-苯基乙烯基]苯基乙酸酯(7)。作为模型化合物确定的环二聚为单不可逆光反应即, (7 → 8 – 11 ;方案4)在没有氧气的情况下。聚合物的溶液的光解6提供了类似的结果,从而[2 π 2 π ]的相邻系绳芪单元环加成占优势。相反,在聚合物膜的辐照中发生了所需的链的光致交联。