Preparation and performance of PET composite membrane with fluorescence indication function in high humidity environment
In order to prepare a film that can continuously emit light in a high humidity and fogging environment,a new rare earth luminescent complex with excellent hydrophobic function and PMMA was uniformly dispersed to make a coating solution based on PET film,and PET-PMMA luminescent composite film was prepared by coating wiping film technology,which was tested and characterized.The results of fluorescence spectrophotometer and confocal microscopy test show that the PET light-emitting film prepared when the luminescent material accounts for 1.50％of the mass fraction of polymer PMMA has good surface uniformity and the best fluorescence performance,and the fluorescence intensity can reach 9 979 a.u.PET-PMMA luminescent composite films can show the character-istic fluorescence emission peaks of Eu3+in the starting light material at different excitation wavelengths.At the same time,the optimal ultraviolet excitation wavelength of the luminescent composite film was 350 nm,and the luminescent composite film has good color purity at the optimal excitation wavelength.By comparing the fluores-cence intensity values of the luminescent composite film immersed in aqueous solution for one week,it was found that the fluorescence intensity loss of the sample was only 5％under the premise that the fluorescence loss of the material was only 1.50％.This shows that the disadvantages of the prepared luminescent composite film being easily quenched when exposed to water have been greatly improved,which provides an important basis for the long-term stable fluorescence indication function of PET agricultural film in humid and foggy environment.
PET composite filmorganic rare earth luminescent materialsfluorescence indicationhigh humidity
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