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15 June 2001 High-dynamic-range cationic two-photon photopolymerization
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Proceedings Volume 4279, Organic Photonic Materials and Devices III; (2001)
Event: Symposium on Integrated Optics, 2001, San Jose, CA, United States
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.
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Yuri B. Boiko, Joannes M. Costa, Mark M. Wang, and Sadik C. Esener "High-dynamic-range cationic two-photon photopolymerization", Proc. SPIE 4279, Organic Photonic Materials and Devices III, (15 June 2001);

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