期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 28, 页码 11440-11447出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202004413
关键词
aromatics; electron transfer; photochemistry; polymers; radicals
资金
- European Union
- MWIDE NRW
- Ministerie van Economische Zaken en Klimaat
- county of Nord Rhine-Westphalia [005-1703-0006]
- BMWi [ZF4288703WZ7]
- FEW Chemicals GmbH [ZF4288702WZ7]
Cyanines comprising either a benzo[e]- or benzo[c,d]indolium core facilitate initiation of radical photopolymerization combined with high power NIR-LED prototypes emitting at 805 nm, 860 nm, or 870 nm, while different oxime esters function as radical coinitiators. Radical photopolymerization followed an initiation mechanism based on the participation of excited states, requiring additional thermal energy to overcome an existing intrinsic activation barrier. Heat released by nonradiative deactivation of the sensitizer favored the system, even under conditions where a thermally activated photoinduced electron transfer controls the reaction protocol. The heat generated internally by the NIR sensitizer promotes generation of the initiating reactive radicals. Sensitizers with a barbiturate group at the meso-position preferred to bleach directly, while sensitizers carrying a cyclopentene moiety unexpectedly initiated the photosensitized mechanism.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据