Thioxanthone-benzothiophenes as photoinitiator for free radical polymerization

被引：62
作者：
Karaca, Nurcan [1 ]
Ocal, Nuket [1 ]
Arsu, Nergis [1 ]
Jockusch, Steffen [2 ]
机构：
[1] Yildiz Tech Univ, Dept Chem, Davutpasa Campus, TR-34210 Istanbul, Turkey
[2] Columbia Univ, Dept Chem, 3000 Broadway, New York, NY 10027 USA
来源：
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 2016年 / 331卷
关键词：
Thioxanthone; Photoinitiator; Photopolymerization; Laser flash Photolysis; PHOTOREDUCTION;
D O I：
10.1016/j.jphotochem.2016.01.017
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Photoinitiators for free radical polymerization based on the thioxanthone chromophore that contains benzothiophene were synthesized and characterized. Compared to thioxanthone, these compounds show a bathochromic shifted absorption up to similar to 460 nm. High quantum yields for intersystem crossing generate sufficient amounts of triplet states. Initiator radicals are generated by reaction of the triplet states with tertiary amines, such as diethanolamine with high rate constants (2-6 x 10(9)M(-1)s(-1)) as determined by laser flash photolysis. Photoinitiated polymerization experiments of MMA showed efficient polymerization with initiator concentrations as low as 0.1 mM. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：22 / 28
页数：7
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