研究目的
Investigating the effect of ultrasound on the switching of cis azobenzene isomers to their trans counterparts in solid films of methyl methacrylate and methacryloyloxyazobenzene copolymers [P(MMA/MOAB)].
研究成果
Ultrasound can trigger the cis-to-trans isomerization of azobenzene chromophores in solid polymer films, with approximately equal contributions from ultrasonic agitation and thermal effects. The activation energy for the isomerization in solid films is comparable to that in solution, indicating that the polymeric matrix affects the kinetics but not the barriers to conformational change.
研究不足
The study was limited to solid polymer films and did not explore the effects of ultrasound frequency and strength variations. The thermal effects during sonication were not fully isolated, potentially affecting the accuracy of the isomerization measurements.
1：Experimental Design and Method Selection:
The study involved the synthesis of AB polymers, preparation of thin films, and their exposure to ultrasound, heat, and visible light to study the isomerization of azobenzene chromophores.
2：Sample Selection and Data Sources:
Thin films of P(MMA/MOAB) with varying AB loadings were prepared and characterized.
3：List of Experimental Equipment and Materials:
Instruments included an ultrasonic bath, UV?vis spectrometer, and 1H NMR spectrometer. Materials included methyl methacrylate, methacryloyloxyazobenzene, and azobisisobutyronitrile.
4：Experimental Procedures and Operational Workflow:
Films were exposed to ultrasound, heat, and visible light, and the isomerization was monitored using UV?vis and 1H NMR spectroscopy.
5：Data Analysis Methods:
The kinetics of isomerization were analyzed using first-order kinetics and Arrhenius plots to determine activation energy.
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