| Because of its good hydrophilicity,biodegradability,non-toxicity and harmlessness,cellulose film is applied to dialysis bags,packaging bags,masks,greenhouses and etc.At present,cellulose film has fewer functions.In order to increase its application range,functionalization of cellulose membrane is very necessary.This article intends to use zinc acetate dihydrate and diethyl zinc as the zinc source to perform in-situ reaction and atomic layer deposition on the surface of cellulose film respectively,and deposit zinc oxide on the surface of cellulose film,so that it has the function of UV-blocking,IR-blocking,antibacterial,and et al.Three different methods were used to modify the surface of cellulose film in this paper.First in-situ reaction method was adopted,the cellulose film was etched by corona and high concentration of sodium hydroxide solution firstly,and then the etched cellulose film was put into different concentrations of sodium hydroxide and zinc acetate solution to make the surface of the cellulose film attach zinc oxide.The effects of different concentrations of sodium hydroxide and zinc acetate solution on the physical properties of cellulose films were studied.The test results showed that the infrared barrier rate of cellulose film treated by in-situ reaction method reached 23.7%,the transmittance rate in the ultraviolet band decreased from 64.9% to 3.1%,and the bacteriostatic rate against S.aureus up to 99.9%.The scanning electron microscope and energy spectrometer were used to observe and analyze the surface of cellulose film,It was found that the zinc oxide layer was attached to the surface of the cellulose film,and thermogravimetric analysis showed that the initial decomposition temperature and decomposition rate of treated cellulose films decreased,but the residual rate increased.Subsequently,atomic layer deposition(ALD)was used to make zinc diethyl react with deionized water and the hydroxyl groups on the surface of cellulose film to form zinc oxide by controlling the cavity temperature and cycle times.The physical properties of the film were tested.The results showed that the infrared barrier rate of cellulose film treated was 22.4%,the ultraviolet transmittance rate decreased from 74.5% to 1.5%,and the antibacterial rate can reach 99.9% by ALD.Scanning electron microscope and energy spectrometer tests showed that the uniform thickness of zinc oxide layer was attached to the surface of the cellulose film treated with ALD,and the thermogravimetric test showed that the thermal residual rate of the treated cellulose film increase.Finally,the in-situ reaction and atomic layer deposition method was used to change the concentration of sodium hydroxide and zinc acetate solutions and cycle times to deposit zinc oxide on the surface of the cellulose film.The treated cellulose films were tested their physical properties,and were analyzed by scanning electron microscopy and etc.The results showed that the surface of the treated cellulose film was covered with the zinc oxide layer,and the thermal residual rate was increased.The infrared blocking rate was 39.0%,the ultraviolet transmittance rate decreased from 64.0% to 1.5% and the bacteriostatic rate up to 99.9%By comparing the physical properties of cellulose films treated with three methods,the results showed that the above three methods can make cellulose films have excellent antibacterial properties;in-situ reaction and atomic layer deposition method required high concentration and large circulation,high temperature treatment to make cellulose film have good IR-blocking;the cellulose films obtained by atomic layer deposition with small circulation had excellent UV-blocking effect,and the in-situ reaction method required a higher concentration to make cellulose film have good UV-blocking ability.However,under the conditions of low circulation and low concentration,the cellulose film treated by in-situ reaction-atomic layer deposition method can have excellent IR-blocking and UV-blocking properties. |
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