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Title of article :
Laser-evoked coloration in polymers
Author/Authors :
H.Y. Zheng، نويسنده , , David Rosseinsky، نويسنده , , G.C. Lim، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2005
Pages :
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Abstract :
Laser-evoked coloration in polymers has long been a major aim of polymer technology for potential applications in product surface decoration, marking personalised images and logos. However, the coloration results reported so far were mostly attributed to laser-induced thermal–chemical reactions. The laser-irradiated areas are characterized with grooves due to material removal. Furthermore, only single color was laser-induced in any given polymer matrix. To induce multiple colors in a given polymer matrix with no apparent surface material removal is most desirable and challenging and may be achieved through laserinduced photo-chemical reactions. However, little public information is available at present. We report that two colors of red and green have been produced on an initially transparent CPV/PVA samples through UV laser-induced photo-chemical reactions. This is believed the first observation of laser-induced multiple-colors in the given polymer matrix. It is believed that the colorants underwent photo-effected electron transfer with suitable electron donors from the polymers to change from colorless bipyridilium Bipm2+ to the colored Bipm+ species. The discovery may lead to new approaches to the development of laser-evoked multiple coloration in polymers.
Keywords :
polymer , Color , Laser-evoked
Journal title :
Applied Surface Science
Journal title :
Applied Surface Science
Serial Year :
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