【摘要】 合成了一个新的双光子吸收聚合引发剂 ,9 乙基 3 {2 [4 ( 2 吡啶基 4 乙烯基 ) 苯基 ] 乙烯基 } 9氢咔唑 (EPVPVC) ,用1HNMR谱、13 CNMR谱和元素分析进行了表征 .测试了紫外吸收光谱、单光子荧光光谱、单光子荧光寿命、单光子荧光量子产率和双光子荧光光谱 .量化计算结果表明 ,EPVPVC的双光子吸收截面为 5 6 6× 10 -50 cm4·s·photon-1.在 780nm的飞秒脉冲激光激发下 ,EPVPVC发出较强的上转换荧光 ,荧光峰位于 5 3 6nm .用EPVPVC做引发剂 ,加入丙烯酸酯型齐聚物(CN12 0C80 ) ,在脉冲宽度为 2 0 0fs ,重复频率为 76MHz ,中心波长为 780nm飞秒脉冲激光下 ,制作了一个三维周期性微结构 .在理论计算的基础上 ,定性地探讨了其可能的聚合机理更多还原

【Abstract】 A new two-photon free-radical photopolymerization initiator 9-ethyl-3-｛2-[4-(2-pyrid-4-yl)-vinylphenyl]-vinyl｝-carbazole (abbrev. EPVPVC) has been synthesized and structurally characterized by 1H NMR spectra, 13C NMR spectra and elemental analyses. Linear absorption, one-photon induced fluorescence, one-photon fluorescence lifetime, one-photon fluorescence quantum yield and two-photon induced fluorescence were experimentally studied. The calculated two-photon absorption cross-section is as high as 56 6×10 -50 cm 4·s·photon -1. When pumped with 780 nm laser irradiation, EPVPVC exhibits strong two-photon induced fluorescence of 536 nm. A microstructure using EPVPVC as initiator has been fabricated under irradiation of 200 fs, 76 MHz Ti: sapphire femtosecond laser at 780 nm. The possible mechanism of photopolymerization was discussed based on quantum chemistry calculations.更多还原