219987-44-7Relevant articles and documents
Dual roles for promoting monomers to polymers: A conjugated sulfonium salt photoacid generator as photoinitiator and photosensitizer in cationic photopolymerization
Jin, Ming,Wu, Xingyu,Malval, Jean Pierre,Wan, Decheng,Pu, Hongting
, p. 2722 - 2730 (2016)
An efficient strategy for comprehensive utilization of the conjugated sulfonium salt photoacid generator (PAG), namely, 3-{4-[4-(4-N,N′-diphenylamino)-styryl]phenyl}phenyl dimethyl sulfonium hexafluoroantimonate, was developed through photoinitiated cationic photopolymerization (CP) of epoxides and vinyl ether upon exposure to near-UV and visible light-emitting diodes (LEDs; e.g., 365, 385, 405, and 425 nm). Photochemical mechanisms were investigated by UV–vis spectra, molecular orbital calculations, fluorescence, cyclic voltammetry, and electron spin resonance spin-trapping analyses. Compared with commercial PAGs, the prepared conjugated sulfonium salt generated H+, which can be used as photoinitiator. Moreover, the fluorescent byproducts from photodecomposition can be used as photosensitizer of commercial iodonium salt in the photoinitiating systems of CP. These novel D-π-A type sulfonium-based photoinitiating systems are efficient (epoxide conversion = 85–90% and vinyl conversion >90%; LEDs upon exposure to 365–425 nm) even in low-concentration initiators (1%, w/w) and low curing light intensities (10–40 mW cm?2).
Conjugated type sulfonium salt photoinitiator with double functions of photoinitiator and photosensitizer, preparation method and application of conjugated type sulfonium salt photoinitiator
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, (2016/12/01)
The invention relates to a conjugated type sulfonium salt photoinitiator with double functions of a photoinitiator and a photosensitizer, a preparation method and an application of the conjugated type sulfonium salt photoinitiator. The conjugated type sulfonium salt photoinitiator is applicable to excitation from near ultraviolet regions with wavelength of 313 nm, 365 nm, 385 nm, 405 nm and 425 nm to a visible region, so that efficient polymerization of various monomers is initiated; synthesis steps of the photoinitiator are simple, the purification is easy, the yield is high, and in the region of 300 nm-425 nm, the optical absorption property is good and the initiation efficiency is high; a product obtained after decomposition can further be taken as the photosensitizer and combined with commercial photoinitiators such as iodonium salt, sulfonium salt and the like to form an efficient photosensitization-initiated binary polymerization system, and the polymerization efficiency is higher; according to the application of the conjugated type sulfonium salt photoinitiator and photosensitizer to a photopolymerization system, cheap LEDs can be taken as excitation light sources in the near ultraviolet region-visible region, the initiating system has the advantages of low addition quantity, high initiation efficiency and wide light source application range, and resource conservation can be realized.
Linkage effects of linear D-π-A-π-D type diketopyrrolopyrrole- triphenylamine based solution-processable organic small molecule photovoltaic materials
Ji, Changyan,Yin, Lunxiang,Wang, Lihui,Jia, Tao,Meng, Shixiang,Sun, Yingji,Li, Yanqin
, p. 4019 - 4026 (2014/05/20)
Four novel D-π-A-π-D-type small molecules (SMs) were synthesized and their π-linkage effects were investigated. Among them, SM2 with vinylene as the π-linkage exhibited better molecular coplanarity, reaching a relatively higher power conversion efficiency (PCE) of 3.76%. SM3 and SM4 with acetylene and acrylonitrile as π-linkages exhibited relatively higher open-circuit voltages (VOC) of 0.93 V and 0.90 V, respectively, owing to their deep-lying HOMO levels. These results gave an important guide for developing new materials in solution-processed small molecule solar cells.
