A pyrrole–carbazole photoinitiator for radical and cationic visible light LED photopolymerization
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In: European polymer journal, Vol. 182.2023, No. 3 January, 111700, 03.01.2023.
Research output: Contribution to journal › Article › Research › peer-review
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TY - JOUR
T1 - A pyrrole–carbazole photoinitiator for radical and cationic visible light LED photopolymerization
AU - Li, Yang
AU - Shaukat, Usman
AU - Schlögl, Sandra
AU - Xue, Tanlong
AU - Li, Jingfang
AU - Nie, Jun
AU - Zhu, Xiaoqun
N1 - Publisher Copyright: © 2022 Elsevier Ltd
PY - 2023/1/3
Y1 - 2023/1/3
N2 - Driven by the growing demand towards low cost and environmentally friendly curing processes, the synthesis of visible light absorbing photoinitiators has been a significant research direction in the field of photopolymerization in the past couple of years. Herein, a novel synthesis route is introduced to obtain a bifunctional pyrrole-carbazole-based photoinitiator (ECMO) via one-step reaction. On account of its excellent absorption at 405 nm and the ability for hydrogen donation, ECMO can initiate free radical polymerization upon visible light exposure and forms colorless photopolymers. Notably, ECMO is further able to act as sensitizer for triarysulfonium salts and significantly extends the absorption window of the onium salts into the visible light spectral region. ECMO sensitized triarysulfonium salts show superior curing performance in cationic polymerization (e.g. higher final monomer conversion) compared to conventional isopropylthioxanthone/triarysulfonium hexafluorophosphate systems. In addition, thermogravimetric analysis shows that ECMO possesses exceptional thermal stability, which facilitates its practical application in photopolymerization processes.
AB - Driven by the growing demand towards low cost and environmentally friendly curing processes, the synthesis of visible light absorbing photoinitiators has been a significant research direction in the field of photopolymerization in the past couple of years. Herein, a novel synthesis route is introduced to obtain a bifunctional pyrrole-carbazole-based photoinitiator (ECMO) via one-step reaction. On account of its excellent absorption at 405 nm and the ability for hydrogen donation, ECMO can initiate free radical polymerization upon visible light exposure and forms colorless photopolymers. Notably, ECMO is further able to act as sensitizer for triarysulfonium salts and significantly extends the absorption window of the onium salts into the visible light spectral region. ECMO sensitized triarysulfonium salts show superior curing performance in cationic polymerization (e.g. higher final monomer conversion) compared to conventional isopropylthioxanthone/triarysulfonium hexafluorophosphate systems. In addition, thermogravimetric analysis shows that ECMO possesses exceptional thermal stability, which facilitates its practical application in photopolymerization processes.
KW - LED, cationic polymerization
KW - Photoinitiator
KW - Triarylsulfonium salts
KW - Visible light
UR - http://www.scopus.com/inward/record.url?scp=85142672570&partnerID=8YFLogxK
U2 - 10.1016/j.eurpolymj.2022.111700
DO - 10.1016/j.eurpolymj.2022.111700
M3 - Article
AN - SCOPUS:85142672570
VL - 182.2023
JO - European polymer journal
JF - European polymer journal
SN - 0014-3057
IS - 3 January
M1 - 111700
ER -
