168094-56-2Relevant academic research and scientific papers
Responsive behavior of 4-(N-maleimido)azobenzene in polymers with aromatic main chain and side chain linked units
Airinei, Anton,Rusu, Elena,Barboiu, Virgil
, p. 489 - 495 (2010)
Polymer matrices with aromatic main chain and side chain linked units (polystyrene, polysulfone) were employed to construct thin films containing maleimidoazobenzene molecules in order to develop new materials with responsive properties. The photochromic behavior of the active compound was studied both in the solid and solution state for comparison. The thermal cis-trans isomerization of azobenzene chromophores in polymer films follows two different kinetic pathways. A double-exponential relaxation process (fast and slow) took place in polystyrene matrix under 70 °C while the thermal isomerization at 70 °C and higher follows a first-order kinetics. The cis isomer content corresponding to the photostationary state was found to be lower in polymer films than in solution.
Synthesis and photoresponsive behavior of the high-Tg azobenzene polymers via RAFT polymerization
Xue, Xiaoqiang,Zhu, Jian,Zhang, Zhengbiao,Zhou, Nianchen,Zhu, Xiulin
experimental part, p. 456 - 462 (2011/12/16)
Well-defined photo-responsive alternating copolymers, poly(4-(N-maleimido) azobenzene-alt-styrene)s (PMSts), were successfully synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization. A divinyl monomer was used in this polymerization to prepare high molecular weight azobenzene polymers. These polymers had good solubility in most organic solvents, formed films well, and had high glass transition temperatures (Tg = 174-250 °C) and were heat resistant (Td > 320 °C). The photo-induced trans-cis isomerization of the copolymers was examined in chloroform solution. Surface-relief-gratings (SRGs) formed on the polymer films were also investigated using illumination from a linearly polarized Kr + laser beam.
