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Kinetic analysis of solid-state photodimerization reaction of photosensitive monomers and a polymer with cinnamoyl moieties

Authors

  • Yang Jiao,

    1. Department of Polymer Science and Engineering, 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. Department of Polymer Science and Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
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  • Xiaoming Dong,

    1. Department of Polymer Science and Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
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  • Rui Li,

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

This work focused on the different kinetic behaviors in photodimerization between a low-molecular-weight molecule and a macromolecule, and the relationship between photodimerization and photo free radical polymerization. We have synthesized two monomers, one (M1) containing a cinnamoyl moiety and another (M2) containing both a cinnamoyl moiety and an acrylate moiety. Their chemical structures were confirmed by FTIR and 1H-NMR spectral analysis. Polymer (P2) was obtained by free radical polymerization of acrylate moieties of M2. Real-time FTIR (RT-FTIR) was used to analyze the kinetic effects of photoreaction. The results strongly suggest that cinnamoyl moieties did not undergo free radical polymerization under exposure of ultraviolet (UV) light. Additionally, the photodimerization of M1 and P2 has been confirmed by RT-FTIR spectra, UV absorption, and transmittance spectra; and photodimerization of M1 was also confirmed by solid-state NMR spectra. The results show that this photoreaction of M1 is much faster than that of M2 and P2. Wide angle X-ray diffraction patterns have demonstrated their different molecular arrangements, which may be responsible for the difference in photodimerization reaction. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

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