PHOTO-INITIATED CATIONIC POLYMERIZATION OF BUTYL VINYL ETHER (BVE) BY PYRYLIUM SALTS
利用荧光探针技术研究氧鎓盐光引发丁基乙烯基醚的阳离子聚合

A group of pyrylium salts with different substituents has been synthesized in this work. Their fluorescence life time, quantum yield and quenching constant by BVE have also been measured. It was found that a strong interaction was observed between BVE and pyrylium salt which contains an electron-withdrawing group, and contrary, the introduction of electron-repulsive groups to the pyrylium salt will decrease this effect. It indicated that these reactions possess the characteristic of electron transfer. Because,the amount of double bond of BVE decreases in the process of BVE polymerization,therefore,in the same time the quenched flu-orescence of pyrylium salt can be recovered gradually. This phenomenon may be used as a probe for studying the process of photo-induced initiated cationic polymerization of BVE.A preliminary mechanism for the photo-initiated polymerization of BVE by pyrylium salt was also discussed.