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Preparation, photoisomerization, and microfabrication with two‐photon polymerization of crosslinked azo‐polymers
Author(s) -
Wang Hui,
Jin Feng,
Chen Shu,
Dong XianZi,
Zhang YongLiang,
Chen WeiQiang,
Zhao ZhenSheng,
Duan XuanMing
Publication year - 2013
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.39507
Subject(s) - photoisomerization , microfabrication , polymerization , materials science , polymer , polymer chemistry , photochemistry , azobenzene , two photon excitation microscopy , polymer science , chemical engineering , chemistry , optics , isomerization , organic chemistry , composite material , physics , catalysis , fluorescence , fabrication , medicine , alternative medicine , pathology , engineering
ABSTRACT We report the preparation, photoisomerization properties, and three‐dimensional (3D) microstructure fabrication with two‐photon polymerization of crosslinked azo‐polymers. A series of bi‐acrylate‐substituted azobenzene derivatives were designed and synthesized as the monomers and/or crosslinkers of the crosslinked azo‐polymers. The doping concentration of the derivatives in pre‐polymer resins was significantly increased due to the introduction of bulky tert ‐butyl and flexible alkyl chains. The double‐exponential dynamics of trans ‐to‐ cis photoisomerization of the azo‐polymers indicated the coexistence of different processes for the azobenzene moieties in the polymeric crosslinked networks. The crosslinked azo‐polymers exhibited ideal “on–off” switching performance in the highly reversible trans – cis – trans isomerization cycles. Furthermore, we prepared a photoresist containing the azobenzene derivative for 3D microstructure fabrication based on two‐photon polymerization. A woodpile photonic crystal with a photonic bandgap at telecommunication wavelength region was successfully fabricated with the azobenzene‐containing photoresist, which would open the way for the design and manufacturing of miniature optical communication devices. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 2947–2956, 2013