基于UV-LED茂铁盐体系对脂环族环氧单体的阳离子光聚合动力学研究

本文利用实时傅里叶变换红外光谱(real-time FTIR)研究了脂环族环氧单体(CE)在405 nm UV-LED光源下的光聚合动力学。以η6-异丙苯茂铁六氟磷酸盐(I-261)作为阳离子光引发剂,2-异丙基硫杂蒽酮(ITX)、姜黄素(CC)和1-4-(苯基偶氮)苯基偶氮]-2-萘酚(SudanⅢ)作为光敏剂,探究该茂铁盐体系对CE单体环氧基团转化率及聚合速率的影响。结果表明,尽管所有光敏剂都能有效地引发光聚合,但是ITX和CC体系在405 nm光源的辐照下表现出更高的聚合效率。在8.0%(质量分数)I-261和0.5%ITX条件下,CE的单体转化率从74.4%提高至89%以上,最大聚合速率提高了1.9倍。在8.0%(质量分数)I-261和1.0%CC条件下,CE的单体转化率从74.4%提高至88%以上,最大聚合速率提高了1.7倍。

Cationic Photopolymerization Kinetics of a Cycloaliphatic Diepoxide Using a Ferrocenium System Under UV-LED Exposure

Cationic photopolymerization kinetics of cycloaliphatic diepoxide(CE)has been investigated by real-time Fourier transform infrared spectroscopy(real time FTIR)under UV-LED light(405 nm),using cyclopentadien-Fe-cymene hexafluorophosphate(I-261)as an initiator and using 2-isopropyl-9H-thioxanthen-9-one(ITX),curcumin(CC),and 1-4-(phenylazo)phenyl]azo]-2-naphthaleno(SudanⅢ)as the photosensitizers.The enhancing monomer conversion rate and polymerization rate of CE was achieved by complex initiator with photosensitizers.All photosensitizers were effective in initiating the photopolymerization while ITX and CC exhibited higher efficiency during the photopolymerization.As a result,with 8.0%(mass fraction)I-261 and 0.5%ITX,the monomer conversion of CE has reached to more than 89%from 74.4%,the maximum polymerization rate increased to 1.9 times.Moreover,using 8.0%(mass fraction)I-261 and 1.0%CC,the monomer conversion of CE has reached to more than 88%from 74.4%,the maximum polymerization rate increased to 1.7 times for the epoxy system.