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Light-control birefringence of oriented poly(vinyl cinnamate) by UV irradiation

Authors

  • Xiaoming Dong,

    1. College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
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  • Jinbao Guo,

    1. College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
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  • Yang Jiao,

    1. College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
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  • Jie Wei

    Corresponding author
    1. College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
    • College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
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Abstract

The research focused on realizing the birefringence of light-control polymer films. The photoelastic birefringence exhibits when Poly (vinyl cinnamate) (PVCi) films are stretched below their glass transition temperature (Tg). The birefringence of PVCi decreases when the UV irradiation happens because the side chains of the PVCi photo-react when the oriented films are exposed to UV light. A method to quantify the birefringence ability of the polymer films is created and verified. Using this method, the decrease of the birefringence through the UV irradiation is quantified. The result shows the birefringence of PVCi can be controlled by altering the UV irradiation time. In addition, oriented PVCi films of different esterification degrees were prepared and irradiated at different time, and the birefringence of them was studied to clarify the birefringence mechanism of light-control polymer films. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

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