Preparation Of Antibacterial Cellulose Non-woven Fabric By Graft Modification

As the most abundant and widely distributed natural macromolecule materials in nature,cellulose has been widely used in various forms of products.However,the surfaces of cellulose products are vulnerable to microbial contamination.Therefore,cellulose with antimicrobial function has been widely investigated.The cationic antibacterial agent-quaternary ammonium salts(QAS)kill bacteria by electrostatic action,and the QAS modified antibacterial cellulose materials are considered to be a safe and effective antibacterial materials.The benzophenone(BP)derivatives kill bacteria by generating active oxygen species(ROS)such as hydrogen peroxide under illumination,and BP modified photo-active antibacterial cellulose have the potential of self-cleaning and degrading bacterial residues while action.At the same time,QAS and BPs can be introduced into the surface of cellulose by graft modification,which ensures the antibacterial cellulose materials have stable structure and excellent bactericidal performance.Further,in order to make up for the defects that the QAS antibacterial surfaces are easy to adsorb bacterial residues and that the photo-active antibacterial surfaces are easily contaminated by bacteria in the dark,the QAS and BP are simultaneously grafted onto the cellulose to prepare multiple antibacterial cellulose.In this paper,the surface of cellulose non-woven fibers(CNWF)was modified by graft modification to obtain single CNWF-QAS antibacterial surface and single CNWF-BP photo-active antibacterial surface.In order to made up for the defects of the two antibacterial surfaces,the preparation and properties of the multi-bacterial cellulose surface were studied.The specific work and main results of this work include:1.Polymerization grafting initiated by cerium ammonium nitrate(CAN),three different alkyl chain length QASs were introduced on the CNWF: Methacryloyloxyethyldimethylhexadecyl ammonium bromide(MHDAB),Methacryloyloxyethyldimethylbenzyl ammonium chloride(MBDAC),and Methacryloyloxyethyltrimethyl ammonium chloride(DMC).The modified surface of long alkyl chain(CNWF-PMHDAB)had the best antibacterial ability,and the grafting of the saturated carbon chain imparted excellent waterwashing resistance and long-lasting effect.The results of process optimization showed that the antimicrobial ability of CNWF-PMHDAB could be increased by adding an initiator before grafting monomer,increasing the reaction temperature,increasing the reaction monomer,and adding the copolymerization component.2.The photo-active antibacterial CNWF was prepared by grafting polymerization of4-methylacrylamide benzophenone(MABP)with saturated carbon chain instead of ester bond,which was obtained by introducing 3,3'4,4'-benzophenonetetracarboxylic dianhydride(BPTCD)by esterification reaction.The hydrogen peroxide production of CNWF-PMABP was more than twice that of CNWF-BPTCD,which led to higher sterilization speed,antibacterial rate,and better photocatalytic ability to degrade the methylene blue(MB).Further,based on the saturated carbon-linked branch,CNWF-PMABP showed more stable performance in use,while CNWF-BPTCD showed hydrolysis and shedding of BPTCD in the experiment.3.By copolymerization grafting initiated by CAN,BP(MABP)and QAS(MHDAB)were simultaneously introduced on the surface of the CNWF to obtain a multi-antibacterial CNWF-p(MABP-co-MHDAB).The hydrogen peroxide yield of the multiple antibacterial surface was similar to that of the single photosensitive antibacterial surface CNWF-PMABP,and the hydrogen peroxide production was 49.40 ?mol/g at 3 h.The synergistic bactericidal effect was achieved by the adsorption capacity and bactericidal ability of QAS and the active oxygen produced by BP,and CNWF-p(MABP-co-MHDAB)showed superior antibacterial ability to CNWF-PMABP and CNWF-PMHDAB with the antibacterial rate against E.coli more than 99.99% after irradiation for 1 h.At the same time,CNWF-p(MABP-co-MHDAB)showed the bactericidal ability under dark condition with the antibacterial rate against E.coli at 99.11% within 0.5 h,which can effectively prevent bacterial contamination under dark conditions and provide long-term bactericidal ability.