Facilely prepared blue-green light sensitive curcuminoids with excellent bleaching properties as high performance photosensitizers in cationic and free radical photopolymerization. Issue 14 (13th March 2018)

• Record Type: Journal Article
• Authors: Han, Weixiang; Fu, Hongyuan; Xue, Tanlong; Liu, Tongzheng; Wang, Yong; Wang, Tao
• Is Part Of: Polymer chemistry. Volume 9:Issue 14(2018)
• Page Start: 1787
• Page End: 1798
• Publication Date: 2018-03-13
• Subjects: Polymers -- Periodicals; Macromolecules -- Periodicals; Polymerization -- Periodicals; 547.705
• DOI: 10.1039/c8py00166a
• Languages: English
• ISSNs: 1759-9954

Abstract

Abstract : Four blue-green light sensitive curcuminoids have been prepared using a facile method. High performances were found as photosensitizers in cationic and free radical photopolymerzation. Abstract : Curcumin is attractive in photopolymerization especially in cationic photopolymerization, because of its broad absorption and nontoxic properties. Curcuminoid (CMD ) is a linear diarylheptanoid and can be considered as a derivative of curcumin. Based on the framework of curcumin, fourCMDs containing carbazole/triphenylamine/dimethylaniline/phenothiazine as electron donors and β-diketone as electron acceptors are prepared using a facile synthesis method. The absorption maxima of the preparedCMDs all showed significant red-shifts compared with that of curcumin. TheCMDs can act as high performance photosensitizers of iodonium salt (ONI) to start the ring-opening cationic photopolymerization of epoxides and the free radical photopolymerization of acrylates upon blue-green light exposure using light-emitting diodes. Excellent polymerization initiating efficiencies are found, and high final function conversions are obtained. The initiating abilities of theCMDs /ONI can be enhanced in the presence of N -vinyl carbazole or triphenylphosphine. More remarkably, theCMDs /ONI exhibit excellent photobleaching properties, and can be used in deep free radical photopolymerization.