Study On The Preparation And Polarization Properties Of Organic/inorganic Composite Photofunctional Fiber Film

Generally speaking,optical films are thin film products with optical properties,which are mainly divided into polarizers and optical film products used in backlight module.The main application areas are TFT-LCD and OLED panel(accounting for about 10?11%of the total cost).At present,these materials are mainly controlled by Japanese and Korean companies,and the core technology is strictly restricted to ensure their long-term monopoly in the market.In terms of polarizing film,Kuarary of Japan has mastered the raw material synthesis and film manufacturing technology of polyvinyl alcohol(PVA)polarizing film,monopolized the global raw material market of PVA polarizing film,and at the same time occupied 70%of the market share of PVA base film used for polarizing film.Therefore,the demand for the localization of optical film materials and the exploration of new technology is very prominent.At present,the mainstream PVA iodine polarizers in the market have the problem that their polarization performance is easily reduced in a high-temperature and high-humidity environment due to its poor resistance of heat and humidity.Therefore,exploring the use of other polymer materials and new processes to prepare new polarizing films and other optical film materials will be very beneficial to the display industry.To this end,this article explores the feasibility of preparing two-dimensional polarizing film materials based on the anisotropy of one-dimensional fibers,which provides a new method and technical reference for the preparation and processing of polarizing film materials.In this paper,firstly,the oriented organic/inorganic composite fiber film is prepared by electrospinning,and then the one-dimensional fiber nanomaterials which have been pre oriented are oriented by uniaxial stretching.Finally,the organic/inorganic composite fiber film was shaped into a film by a solvent annealing process.At last,we obtained an anisotropic organic/inorganic composite fiber film.In addition,the optical anisotropy and polarization properties of the composite fiber membrane were studied,and the structure-activity relationship of the composite fiber membranes was investigated.The specific research is as follows:(1)Preparation and optical anisotropy of poly(methyl methacrylate)fiber filmPoly(methyl methacrylate)(PMMA)fibers were prepared by electrospinning.Highly oriented and optically anisotropic PMMA fibers were successfully prepared by uniaxial tension and secondary orientation.When chloroform was used as solvent and the rotation speed of roller was 1500 r/min,the diameter of PMMA fibers was smaller and the degree of orientation was better.In the process of uniaxial tension,the optimum temperature is 125?,and the optical anisotropy increases with the increase of tensile amplitude.It is found that solvent vapor annealing can increase the transparency of PMMA optical functional films,but annealing can destroy the morphology of PMMA optical functional films and weaken the optical anisotropy.(2)Preparation and polarization properties of PMMA/carbon nanotube composite optical functional fiber filmIn order to solve the problem that the optical anisotropy of pure PMMA oriented fibers is weakened after annealing,an organic/inorganic composite strategy is proposed to improve the optical anisotropy.Carbon nanotubes(CNTs)are dispersed in PMMA/trichloromethane(TCM)spinning solution,and then the PMMA/CNTs composite fibers are prepared by electrospinning,The results show that PMMA/CNTs composite fibers maintain good optical anisotropy after annealing.(3)Preparation and polarized fluorescence of PMMA/up-conversion nanorod composite fiber filmsIn order to reduce the light energy loss of polarizer due to light absorption,up-conversion nanorods(UCNRs)with polarizable fluorescence were introduced.NaYF₄:Yb³⁺,Tm³⁺and NaYF4:Yb³⁺,Er³⁺up-conversion nanorods were synthesized by hydrothermal method.Oriented PMMA/UCNRs composite fiber films were prepared by electrospinning.With the increase of UCNRs content,the fluorescence intensity increased,and the aligned PMMA/UCNRs composite films had polarized light properties.With the increase of stretching amplitude,the degree of polarization increases,and the directional arrangement of UCNRs in the composites is successfully realized,which provides a new idea and method for the preparation of wavelength adjustable polarized fluorescent films.