Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Efficacy Analysis and Kinetics of 3-Component Photopolymerization by Visible-LED/Coumarin and Enhanced by Additives of Iodonium Salt and Amine

Version 1 : Received: 10 July 2021 / Approved: 12 July 2021 / Online: 12 July 2021 (22:22:54 CEST)

How to cite: Lin, J.; Lalevee, J.; Cheng, D. Efficacy Analysis and Kinetics of 3-Component Photopolymerization by Visible-LED/Coumarin and Enhanced by Additives of Iodonium Salt and Amine. Preprints 2021, 2021070274 (doi: 10.20944/preprints202107.0274.v1). Lin, J.; Lalevee, J.; Cheng, D. Efficacy Analysis and Kinetics of 3-Component Photopolymerization by Visible-LED/Coumarin and Enhanced by Additives of Iodonium Salt and Amine. Preprints 2021, 2021070274 (doi: 10.20944/preprints202107.0274.v1).

Abstract

This article presents, for the first time, the kinetics and the general conversion features of free radical polymerization (FRP) in a 3-component system (A/B/N), with [A] being the initiator, and [B] and [N] are additives, based on the proposed mechanism of Rahal et al. Higher FRP can be achieved by additives [B] and [N], via the dual function of (i) regeneration [A], and (ii) generation of extra radicals (R) via the radicals (S' and S) produced by N.The initiator (coumarin) shows a dual photo-oxidation and photo-reduction character for high efficacy. The FRP conversion efficacy (CE) depends not only on the property of the initiator [A], the additives [B] and [N}, but also the types of monomers. For example, when [A]=CoumC, [A]/NPG is more efficient than [A]/Iod, but revserse trend occurs in some monomers. However, 2-component systems (with CE=0% to 80%) are always less efficient than that of 3-component systems (with CE=70% to 86%, in TMPTA). Specific systems with [A]=coumarins, [B]=Iodonium salt, and N=NPG are analyzed. Analytical formulas for the role of each component concentration, light intensity and coupling rates on the conversion efficacy are derived.

Subject Areas

polymerization kinetics; photoinitiator; free radical polymerization; photo-oxidation; 3D printing.

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