Chao-Ching Chang1,2, Chih-Shing Wang1, Yu-Chen Chen1 and Liao-Ping Cheng This email address is being protected from spambots. You need JavaScript enabled to view it.1,2

1Department of Chemical and Materials Engineering, Tamkang University, Tamsui, Taiwan 251, R.O.C.
2Energy and Opto-Electronic Materials Research Center, Tamkang University, Tamsui, Taiwan 251, R.O.C.


Received: January 13, 2014
Accepted: May 5, 2014
Publication Date: June 1, 2014

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Optical coatings exhibiting photochromic effects were prepared by UV-curing of a coating formulation that incorporates a hexa-functional monomer, DPHA, and an organic dye, spironaphthooxazine. Spectroscopic studies of the coatings indicated efficient photochromic activities in response to UV irradiation. The depth of color and the rate of bleaching at 610 nm were found to depend on the UV dosage and the dye content; specifically, the transmittance returned from 42 to 82% and from 38 to 67% in 60 s. for the coating containing 3.7 wt% dye that received 0.45 and 3.6 of J/cm2 of UV exposure, respectively. Furthermore, the coatings were very hard (7H, pencil hardness) and adhered perfectly (100%, peel test) on poly (methyl methacrylate) substrates.

Keywords: Photochromic, Coatings, Spirooxazine, Polyacrylate


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