molecule of maleic anhydride (MA) by ATRP, and then reacted with ZnTAPc to form a water-soluble and thermoresponsive photosensitizer. The lower critical solution temperatures for the copolymers can be easily controlled by changing the ratio of MPEG and PNIPAAM. In aqueous solution, the thermosensitive copolymers will self-assemble into micelles and characterized by dynamic light scattering and transmission
通过简单的方法合成了新型的四氨基酞菁锌(II)嵌段共聚物甲氧基聚乙二醇-b-聚(N-异丙基丙烯酰胺)(MPEG - b -PNIPAAM-ZnTAPc)。首先,二嵌段共聚物MPEG- b-PNIPAAM通过原子转移自由基聚合(ATRP)合成,并通过ATRP用一分子的马来酸酐(MA)官能化,然后与ZnTAPc反应形成水溶性和热敏性光敏剂。通过改变MPEG和PNIPAAM的比例,可以轻松控制共聚物的较低临界溶液温度。在水溶液中,热敏共聚物会自组装成胶束,并具有动态光散射和透射电子显微镜的特征,并且胶束的尺寸会随着温度的升高而增加。在胶束中,ZnTAPc将聚集以诱导荧光猝灭。作为光敏剂,MPEG- b -PNIPAAM-MA-ZnTAPc可产生具有良好的量子产率(Φ单线态氧种Δ = 0.23),这被认为是主要的活性氧。基于MTT分析,该共聚物具有较低的暗细胞毒性和较高的光毒性,因此MPEG- b