Design,synthesis And Characterization Of Fluorescent Self-repairing Polymer

In recent years,with the advancement of science and technology,polymer materials have gradually replaced the era dominated by iron and porcelain and entered the polymer era.However,the use of polymer materials will inevitably produce mechanical damage,aging and silver streaks,which make the materials damaged and discarded,resulting in the waste of resources and environmental pollution.By synthesizing a heat-resistant polymer material with both room temperature self-healing performance and luminous performance,it not only solves the waste of resources and environmental pollution,but also,the introduction of fluorescent groups simultaneously enhances the tolerance of materials and the diversification of colors used,thereby obtaining a green environmentally friendly polymer material that can be recycled and has rich colors.In this project,two polymers with room temperature self-healing properties were prepared by free-radical random copolymerization in water solvent(acrylic acid(AA),acryloxyethyl trimethyl ammonium chloride(DAC)and methacryloxy ethyl trimethyl ammonium chloride(DMC)were used as monomers).Through optimizing the preparation conditions,the best preparation conditions were obtained: the ratio of AA:DAC is 1:1,the initiator is 0.26%(molar ratio),the polymerization time is 24 h,and the monomer concentration is 0.5mol/L.Under these conditions,polymers with a molecular weight exceeding 1 w,a heat-resistant temperature above130 °C,and a self-healing rate of 100% in 30 minutes at room temperature and reproducible self-healing were synthesized;Subsequently,AA,DAC,and DMC were used for free-radical random copolymerization in DMF solution.After polymerization,two polymer substrates were obtained.The best preparation conditions were as follows: the ratio of AA:DAC is 1:1,the initiator is 0.27%(molar ratio),the polymerization time is 12 h,and the monomer concentration is 0.5 mol/L.Under these conditions,the self-healing polymers with low molecular weight(less than 1 w)and a repair rate of 100% in 1 minute were synthesized.Based on the above experiments,the fluorescent monomers(ferric chloride porphyrin and vinyl carbazole)were introduced in a chemically doped manner,and three linear polymers that can emit light and self-repair at room temperature were prepared.Using infrared spectroscopy,NMR,fluorescence spectroscopy,DSC,thermogravimetry and other methods to analyze the structures of the fluorescent self-repairing polymer,the results proved that the fluorescent monomers were all successfully introduced into the polymer substrate.At the same time,it is speculated that the polymer will have self-repairing performance and improve the mechanical performance after cross-linking.Thus,fluorescent hydrogels were prepared in water system and DMF system respectively,and the water absorption performance of fluorescent hydrogels,the influence of crosslinking agent,as well as the luminescence test were carried out,the results showed that the prepared hydrogel can repeatedly absorb and release water,and the water absorption performance is between 14-30 times.In this paper,the room temperature fluorescent self-repairing polymers were prepared by cheap and easily available raw materials using simple and universal preparation methods.It has the characteristics of rapid and repeatable healing,macroscopically visible healing process,recycling of non-renewable resources,and luminescence.Using above characteristics of polymers to construct a room-temperature self-healing and light-emitting functional material(applied to organic light-emitting diodes,solar cells,field effect transistors,storage devices,artificial skin,targeted drug delivery,etc.),it will have important theoretical significance and practical value.