Effect of Colloidal Silica on the Photochromic Properties of Hard Coating Films Prepared by Sol-Gel Method | Zendy

Yong Tak Shin | Zendy; Min Ji Lee | Zendy; Kyung Sook Cho | Zendy; Ki Chang Song | Zendy

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Effect of Colloidal Silica on the Photochromic Properties of Hard Coating Films Prepared by Sol-Gel Method

Author(s) -

Yong Tak Shin,

Min Ji Lee,

Kyung Sook Cho,

Ki Chang Song

Publication year - 2011

Publication title -

korean chemical engineering research

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.168

H-Index - 9

eISSN - 2233-9558

pISSN - 0304-128X

DOI - 10.9713/kcer.2011.49.5.535

Subject(s) - photochromism , coating , materials science , sol gel , colloid , colloidal silica , chemical engineering , nanotechnology , engineering

Organic-inorganic hybrid coating solutions were prepared starting from colloidal silica, lanthanum nitrate and γ-glycidoxypropyl trimethoxysilane by the sol-gel method. Also, spiropyran-doped hard coating solutions were pre- pared by mixing the spiropyran solution, obtained after dissolving spiropyran dye into tetrahydrofuran solvent, with the organic-inorgnic hybrid coating solutions. The spiropyran-doped hard coating solutions were applied as a thin layer to polycarbonate sheets, and their photochromic properties were investigated. The effect of amount of colloidal silica added into the coating solutions was investigated on the photochromic properties of coating films. Both decoloration rate and pencil hardness of the coating films were increased with increasing the amounts of colloidal silica.

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