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Kinetic analysis of solid‐state photodimerization reaction of photosensitive monomers and a polymer with cinnamoyl moieties
Author(s) -
Jiao Yang,
Guo Jinbao,
Dong Xiaoming,
Li Rui,
Wei Jie
Publication year - 2010
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.31890
Subject(s) - moiety , monomer , radical polymerization , photochemistry , chemistry , acrylate , polymerization , polymer chemistry , photopolymer , fourier transform infrared spectroscopy , polymer , acrylate polymer , molecule , organic chemistry , chemical engineering , engineering
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 (M 1 ) containing a cinnamoyl moiety and another (M 2 ) containing both a cinnamoyl moiety and an acrylate moiety. Their chemical structures were confirmed by FTIR and 1 H‐NMR spectral analysis. Polymer (P 2 ) was obtained by free radical polymerization of acrylate moieties of M 2 . 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 M 1 and P 2 has been confirmed by RT‐FTIR spectra, UV absorption, and transmittance spectra; and photodimerization of M 1 was also confirmed by solid‐state NMR spectra. The results show that this photoreaction of M 1 is much faster than that of M 2 and P 2 . 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