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Polymers 2014, 6(5), 1489-1501;

Modeling the Kinetics of Enhanced Photo-Polymerization under a Collimated and a Reflecting Focused UV Laser

New Vision Inc., 5F, No. 27, Lane 10, Jiuquan St., Taipei 103, Taiwan
Department of Life Science, Fu Jen Catholic University, New Taipei City 24205, Taiwan
Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung 404, Taiwan
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Received: 27 March 2014 / Revised: 1 May 2014 / Accepted: 12 May 2014 / Published: 20 May 2014
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This study explored the kinetics of ultraviolet (UV) laser photoinitiated polymerization in thick polymer systems to achieve improved polymerization efficiency and uniformity. The modeling system comprised an incident UV laser and its reflecting beam, which was focused by a concave mirror to compensate for the exponential decay in the absorbing medium. The polymerization kinetic equation was numerically solved for the initiator concentration. The crossover time was calculated and compared among single beam, two collimated beam and collimated plus reflecting focused-beam systems. For the single beam case, analytic formulas for the time dependent incident beam is derived and demonstrated by measured data. A theoretical crossover time is defined to analyze the measured data based on the dynamic moduli. Lastly, the polymerization boundary dynamics are illustrated, showing the advantage of the combined two beam system. The numerical results provide useful guidance and a novel means for accelerated uniform photo-polymerization, which cannot be achieved by other means. View Full-Text
Keywords: modeling; polymerization; photoinitiation; UV laser; crossover time modeling; polymerization; photoinitiation; UV laser; crossover time

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Lin, J.-T.; Liu, H.-W.; Cheng, D.-C. Modeling the Kinetics of Enhanced Photo-Polymerization under a Collimated and a Reflecting Focused UV Laser. Polymers 2014, 6, 1489-1501.

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