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Proceedings Paper

High-dynamic-range cationic two-photon photopolymerization
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Paper Abstract

Cationic-induced two-photon photopolymerization is demonstrated at 710 nm, using an isopropylthioxanthone/diarylidonium salt initiating system for the cationic polymerization of an epoxide. The polymerization threshold J2th is found to be approximately 1 GW/cm2, with a dynamic range of > 100, i.e. the material can be fully polymerized at intensities > 100 times the threshold level without damage. The polymerization rate R is found to be proportional to the m equals 1.7 power of the intensity, or R equals [C (J-J2th)]m equals [C (J-J2th)]1.7, which implies a significantly stronger localization of the photochemical response than that of free radical photoinitiators. R and J2th significantly improve when the concentration z of the initiator (onium salt) increases.

Paper Details

Date Published: 15 June 2001
PDF: 9 pages
Proc. SPIE 4279, Organic Photonic Materials and Devices III, (15 June 2001); doi: 10.1117/12.429388
Show Author Affiliations
Yuri B. Boiko, Univ. of California/San Diego (United States)
Joannes M. Costa, Call/Recall, Inc. (United States)
Mark M. Wang, Univ. of California/San Diego and Call/Recall, Inc. (United States)
Sadik C. Esener, Univ. of California/San Diego (United States)

Published in SPIE Proceedings Vol. 4279:
Organic Photonic Materials and Devices III
Bernard Kippelen; Donal D. C. Bradley, Editor(s)

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