Westfälische Wilhelms-Universität Münster, Münster, Germany.
Macromol Rapid Commun. 2013 Jan 11;34(1):94-101. doi: 10.1002/marc.201200595. Epub 2012 Oct 26.
New types of photoactive homo and block copolymers bearing α-hydroxyalkylphenylketone (2-hydroxy-2-methyl-1-phenylpropan-1-one) moieties as backbone substituents are prepared using nitroxide-mediated radical polymerization (NMP). Such polymers can be readily activated via the Norrish-type I photoreaction to give polymeric acyl radicals. Photolysis in the presence of a persistent nitroxide, which serves as a C- radical trapping reagent, leads to chemically modified polymers conjugated with nitroxide moieties. The number-average molecular weight (M(n)) of the prepolymers and the chemically modified polymers was determined by gel permeation chromatography (GPC). Structures were further confirmed by NMR spectroscopy and by attenuated total reflection (ATR) Fourier transform infrared (FTIR) spectroscopy.
新型含α-羟烷基苯基酮（2-羟基-2-甲基-1-苯基-1-丙酮）部分作为主链取代基的光活性均聚物和嵌段共聚物是通过氮氧自由基介导的自由基聚合（NMP）制备的。这些聚合物可以通过 Norrish 型 I 光反应容易地被激活，得到聚合酰基自由基。在持久的氮氧自由基（作为 C-自由基捕获试剂）存在下进行光解，导致与氮氧自由基部分键合的化学修饰聚合物。预聚物和化学改性聚合物的数均分子量（M(n)）通过凝胶渗透色谱（GPC）确定。结构进一步通过 NMR 光谱和衰减全反射（ATR）傅里叶变换红外（FTIR）光谱证实。
