可见光响应的荧光增白剂基多功能光引发体系

Visible-light-sensitive Versatile Fluorescent Brightener-based Photoinitiating Systems

将4,4′-双(苯并噁唑-2-基)二苯乙烯(BBS)、7-二乙氨基-4-甲基香豆素(C 1)、双-(三嗪基氨基)-二苯乙烯二磺酸(CBUS 450)、4,4′-双(2-磺酸苯乙烯基钠)联苯(CBS X)和1,4-双(2-苯并噁唑基)萘(OB 7)等5种含有不同荧光发射基团的商用荧光增白剂分别与二苯基碘鎓六氟磷酸盐(IOD)组成二元光引发体系,再与N-乙烯基咔唑(或叔胺)组成三元光引发体系,在可见光发光二极管(LED)光源辐照下,通过自由基聚合反应制备丙烯酸酯树脂,同时通过阳离子/自由基同步聚合反应制备互穿网络聚合物.利用紫外-可见分光计荧光分光计,电子自旋共振波谱仪,傅里叶变换红外光谱仪,扫描电子显微镜和原子力显微镜对荧光增白剂和互穿网络聚合物进行了表征.研究结果表明,荧光增白剂在可见光LED的照射下可作为具有高效能的多功能光引发剂.其中苯并噁唑-萘衍生物(OB 7)、三嗪茋衍生物(CBUS 450)、二苯乙烯-联苯衍生物(CBS X)和香豆素衍生物(C 1)基二元光引发体系和三元光引发体系即使在空气中也表现出了优异的光引发能力.

Five kinds of commercial fluorescent brighteners containing different fluorophores were investiga-ted,i.e.4,4′-bis(2-benzoxazolyl)stilbene(BBS),diethylamino-4-methylcoumarin(C 1),bis-(triazinylamino)-stilbene disulphonic(CBUS 450),4,4′-bis(2-sodium sulphonate styryl)biphenyl(CBS X)and 1,4-bis(2-benzoxazolyl)naphthalene(OB 7),the two-component photoinitiating systems including these fluorescent brighteners and diphenyliodonium hexafluorophosphate(IOD)and the three-component photoinitiating systems including these brighteners,IOD and optionally N-vinyl carbazole or amine were formed,respectively,both of them photoinitiated the free radical photopolymerization for the preparation of polyacrylates and the concomitant cationic/radical photopolymerization for the formation of an interpenetrating polymer network upon visible-light light-emitting diode(LED)exposure.The light absorption abilities of fluorescent brighteners were characterized by UV-visible spectrometer,the photochemical properties of them were analyzed by fluorescence spectrometer and electron spin resonance,the photoinitiation efficiencies of the photoinitiating systems were monitored by real-time Fourier transform infrared spectroscopy,meanwhile,the fracture surface morphology and surface morphology of the products obtained from the concomitant cationic/radical photopolymerization of epoxides/acrylates blends were observed and analyzed by scanning electron microscope and atomic force microscope,respectively.The results showed that fluorescent brighteners could be used as a versatile high-performance photoinitiator under visible-light LED,among them,the two-component and three-component photoinitiating systems based on naphthalene-benzoxazole OB 7,sulfonated triazinylstilbenes CBUS 450,sulfonated stilbene-biphenyl CBS X and coumarin C 1 exhibited quite excellent photoinitiating abilities even under air.