荧烷染料/二芳基碘鎓盐同步光生色和光聚合体系

荧烷染料(FR)和二芳基碘盐(On⁺X^-)组成的体系,在光作用下,通过激发态的荧烷染料与碘盐之间发生电子转移反应,生成开环结构的荧烷染料有色体,伴随发生盐的光解反应,生成活性引发自由基碎片。该体系不仅可有效地引发烯类单体的聚合反应,也可同步发生光生色作用,产生较高的色密度。进一步研究了二芳基碘盐的取代基不同碳链长度和不同对离子及浓度诸因素,在光固化体系中对生色反应的影响。同时FR/On⁺X^-体系引发光交联形成的有色薄膜具有良好的色稳定性。

Photoinduced Polymerization with Samultaneous Color Formation of Fluorane Dye with Diaryliodonium Salts

The electron transfer occured between the excited fluorane leuco dye and diaryliodonium salt upon UV irradiation resulted in the formation of ring opening colorant and photolysis of iodonium salt, yielding active radical species. Such a system was found to be not only able to initiate the polymerization of epoxy acrylic acid, but also induce the color formation with high color density. Several diaryl iodonium salts with different chain length have been examined. Effects of chain length and counterions in diaryliodonium salts on color formation have been investigated. The colorant formed from fluorane and iodonium salt in photocrosslinked film possessed good thermal and solvent stability.