Preparation And Study Of The Antibacterial And Antistatic Droperties Of Silver/reduced Graphene Oxide@polypropylen Meltblown Nonwoven

Polypropylene(PP)meltblown nonwoven has good mechanical properties,acid,alkali and organic solvents resistance,and comparatively low-cost.Thus,it is usually used as disposable or limited-use protective clothing,surgical gowns,masks and other medical and health products.However,PP meltblown nonwoven can’t provide sufficient safety protection for users and as health care products,and is prone to static charge accumulation during partical application.These passive effects have limited its further application on medical devices and operations.Reduced graphene oxide(rGO)and silver(Ag)nanoparticles have antibacterial and antistatic properties The combination of rGO and Ag nanoparticles can prevent the agglomeration of Ag nanoparticles and forms a good conductive network,which contributes to the enhancement of the conductivity and antibacterial properties.At present,there are few reports on the antibacterial and antistatic function modification of Ag/rGO loaded on the surface of PP meltblown nonwoven.Therefore,this research not only can provide new ideas for the multifunctional modification of medical PP meltblown nonwoven materials but also added its application value on the medical and health industry.PP is a non-polar polymer material,and its surface doesn’t have any functional groups,so its surface is inert and very difficult to be loaded or modified.Prior to the experiment,the surface of PP meltblown material was firstly modified by polydopamine(PDA)and PDA-polyethyleneimine(PEI),respectively,and marked by M-PP and P-PP in this paper.Then,the morphology and composition of M-PP and P-PP were characterized by scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR)and X-ray photoelectron spectroscopy(XPS).The results showed that the P-PP material has a shorter reaction cycle.The P-PP surface became smoother which is more conducive to the uniform distribution of rGO and Ag nanoparticles on the modified surface of PP.The mechanical properties analysis showed that the tensile strength of both P-PP and M-PP decreased.The longitudinal and transverse tensile strength of P-PP slightly dropped by 6.08%and 8.04%,respectively.On the other hand,the tensile strength of M-PP has a larger decrease,and its longitudinal and transverse tensile strength decreased by 18.24%and 13.39%,respectively.Subsequently,graphene oxide(GO)was prepared by the modified Hummers method and characterized by SEM,transmission electron microscopy(TEM),FTIR,X-ray diffraction(XRD)and thermogravimetric analysis(TG).The results showed that GO was successfully prepared,and exhibited a typical wrinkle sheet shape.Its surface was rich in oxygen-containing groups.Then,GO with different concentrations were loaded onto the P-PP surface by the microwave assisted method,and then rGO@P-PP was obtained by ascorbic acid reduction and characterized by SEM,XPS,XRD and TG.It was found that rGO was successfully uniformly loaded on the P-PP surface.The results of antibacterial and antistatic performance analysis showed that when the concentration of GO was lmg/mL,the antibacterial rate of rGO@P-PP against Escherichia coli and Staphylococcus aureus was 98.14%and 98.29%,respectively,its surface specific resistance was 4.86KΩ and its half-life is 0.11 s.The results from mechanical properties showed that the longitudinal and transverse tensile strength of rGO@P-PP decreased by 6.08%and 20.53%,respectively.Furthermore,the Ag/rGO@P-PP composite meltblown nonwoven materials with different concentrations of Ag and rGO were obtained by microwave assisted method.For comparison,Ag/rGO@PP and Ag@P-PP were prepared by the same process.The morphology,antibacterial and antistatic properties of these three samples were analyzed and contrasted.The results showed that Ag/rGO was successfully loaded onto the surface of P-PP meltblown nonwoven material.When the concentration ratio of GO and Ag is 1:4,the antibacterial rate of Ag/rGO@P-PP against both Escherichia coli and Staphylococcus aureus was>99.99%,the surface resistivity of Ag/rGO@P-PP was 1.77 KΩ and its half-life period reached 0.01 s.Compared with Ag@P-PP and Ag/rGO@PP,nano-Ag were uniformly loaded on the P-PP surface as a result of the decreased agglomeration.Moreover;the antibacterial and antistatic properties of Ag/rGO-P-PP were also optimal.The mechanical properties analysis results showed that the longitudinal and transverse tensile strength of Ag/rGO@P-PP decreased by 11.49%and 28.57%,respectively,which does not affect its normal usage.