Transient absorption spectroscopy of photochemical reactions in different photoinitiators

Marius Navickas; Mikas Vengris

doi:10.1117/12.2665498

8 June 2023 Transient absorption spectroscopy of photochemical reactions in different photoinitiators

Marius Navickas, Mikas Vengris

Proceedings Volume PC12584, Smart Materials for Opto-Electronic Applications; PC125840J (2023) https://doi.org/10.1117/12.2665498
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

Multi-photon photopolymerization finds a broad area of applications spanning from microelectronics to medicine. Polymerization process requires the use of photoinitiator molecules that produce free radicals triggering the cross-linking reactions in pre-polymer. In this work, we explore the differences in photoinitiation behaviour of commercial Irgacure369, Irgacure651, TPO and thioxanthone photoinitiators. The TA spectra of Irgacure369, Irgacure651 and TPO feature two broad induced absorption (IA) bands with different relaxation characteristics. IA of Irgacure369 reveals more complex structural dynamics than Irgacure651. Nano-microsecond transient absorption (Flash photolysis) measurements allow us to identify the spectral features of resulting photoactive species to facilitate their further dynamics and roles in polymerization process.

Conference Presentation

Citation Download Citation

Marius Navickas and Mikas Vengris "Transient absorption spectroscopy of photochemical reactions in different photoinitiators", Proc. SPIE PC12584, Smart Materials for Opto-Electronic Applications, PC125840J (8 June 2023); https://doi.org/10.1117/12.2665498

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