Institut de Science des Matériaux de Mulhouse IS2M-UMR CNRS 7361-UHA, 15, rue Jean Starcky, F-68057 Mulhouse Cedex, France.
Macromol Rapid Commun. 2013 Jul 12;34(13):1104-9. doi: 10.1002/marc.201300302. Epub 2013 Jun 4.
For polymer synthesis upon visible light, actual photoinitiator operates in a restricted part of the spectrum. As a consequence, several photoinitiators are necessary to harvest all of the emitted visible photons. Herein, 2,7-di-tert-butyldimethyldihydropyrene is used for the first time as a multicolor photoinitiator for the cationic polymerization of epoxides. Upon addition of diphenyliodonium hexafluorophosphate and optionally N-vinylcarbazole, the originality of this approach is to allow efficient monomer conversions under various excitation light sources in the 360-650 nm wavelength range: halogen lamps, and light-emitting and laser diodes. The synthesis of an interpenetrated polymer network from an epoxide/acrylate blend using a red light at 635 nm is also feasible. The formed polymer material exhibits a photochromic character.
对于可见光下的聚合物合成，实际的光引发剂只能在光谱的有限部分起作用。因此，需要几种光引发剂才能收集所有发射的可见光光子。在此，首次将 2,7-二叔丁基二氢苝用作多色光引发剂，用于环氧化物的阳离子聚合。加入二苯基碘𬭩六氟磷酸盐和任选的 N-乙烯基咔唑后，该方法的新颖之处在于能够在 360-650nm 波长范围内的各种激发光源下高效进行单体转化：卤素灯、发光二极管和激光二极管。使用 635nm 的红光还可以从环氧化物/丙烯酸酯共混物合成互穿聚合物网络。形成的聚合物材料表现出光致变色特性。
