| With the development of science and technology,electromagnetic wave has been widely used in many fields,such as radio,radar,mobile communication,electronic heating,magnetic therapy and so on.It also inevitably brings all kinds of electromagnetic waves to people.Therefore,it is necessary to study the simple and easy detection method of electromagnetic waves.Environmental responsive polymers are a class of polymers which can respond to the changes in the external environment and produce corresponding physical and chemical properties and even mutations.The liquid crystal elastomer can change the shape of the shape by changing the arrangement of the liquid crystal primitives under the stimulation.In this study,the liquid crystal elastomer is combined with graphene and iron oxide to prepare the visible and microwave responsive liquid crystal elastomer films,which can be used to detect electromagnetic waves.The main research of this paper include:?1?This paper firstly synthesized mesogenic 4-methoxy phenyl-4-?1-butene phenoxy?benzoic acid ester?MBB?,crosslinking agent 1,4 nonyl phenyl alkene?11UB?and 4-methoxy phenoxy phenol-1-butene?MOCH3?.After polymerization with the main chain of polysiloxane?PMHS?,the thermal responsive liquid crystal elastomer?LCE film?is used as the base material.The effect of low temperature group?MOCH3?on the phase transition temperature(TNI)of thermal responsive LCE films was investigated by doping low temperature group?MOCH3?.The undoped MOCH3thermal response response compared to the LCE films LCE films and doped MOCH3two thin film heat,thermal contraction rate is about 32.5%,but the LCE with MOCH3film at 40°C to 70°C in the complete deformation deformation,while the LCE films with MOCH3 at 60°C to complete the maximum contraction deformation at 95°C.?2?Visible light as one of the electromagnetic waves,graphene can effectively absorb and convert light energy into heat energy,so doped graphene can get light responsive liquid crystalline elastomers?G-LCE thin films?.The effect of TNII was studied by adding MOCH3.The results showed that the G-LCE with MOCH3 films began to shrink and 4×105 lux of light under the maximum contraction in 1.25×105 lux of light,while the G-LCE film at 2×105 lux light began to shrink and 5.5×105 lux of light under maximum contraction.?3?The microwave responsive liquid crystal elastomer?Fe3O4/LCE film?and Fe3O4/LCE film doped with MOCH3 were obtained by doping Fe3O4 nanoparticles in the thermal response LCE film by using the method of vesicle.The results show that the contraction amplitude of Fe3O4/LCE film is more obvious with the increase of the concentration of Fe3O4 nanoparticles under the condition of a certain microwave intensity,and the Fe3O4/LCE film doped with MOCH3 can complete the maximum contraction at lower microwave intensity.According to the above conclusions,the prepared G-LCE films and Fe3O4/LCE films can be applied to detect visible light and microwave in the environment.This method opens up the potential of environmental responsive polymers for environmental detection. |
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