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Polymers 2014, 6(2), 552-564; doi:10.3390/polym6020552

Optimal Focusing and Scaling Law for Uniform Photo-Polymerization in a Thick Medium Using a Focused UV Laser

1 New Vision Inc., 5F, No. 27, Lane 10, Jiuquan St., Taipei 103, Taiwan 2 Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung 404, Taiwan
* Author to whom correspondence should be addressed.
Received: 5 December 2013 / Revised: 13 February 2014 / Accepted: 14 February 2014 / Published: 21 February 2014
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We present a modeling study of photoinitiated polymerization in a thick polymer-absorbing medium using a focused UV laser. Transient profiles of the initiator concentration at various focusing conditions are analyzed to define the polymerization boundary. Furthermore, we demonstrate the optimal focusing conditions that yield more uniform polymerization over a larger volume than the collimated or non-optimal cases. Too much focusing with the focal length f < f* (an optimal focal length) yields a fast process; however, it provides a smaller polymerization volume at a given time than in the optimal focusing case. Finally, a scaling law is derived and shows that f* is inverse proportional to the product of the extinction coefficient and the initiator initial concentration. The scaling law provides useful guidance for the prediction of optimal conditions for photoinitiated polymerization under a focused UV laser irradiation. The focusing technique also provides a novel and unique means for obtaining uniform photo-polymerization within a limited irradiation time.
Keywords: photo-polymerization; focused UV laser; scaling law photo-polymerization; focused UV laser; scaling law
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Lin, J.-T.; Cheng, D.-C. Optimal Focusing and Scaling Law for Uniform Photo-Polymerization in a Thick Medium Using a Focused UV Laser. Polymers 2014, 6, 552-564.

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