基于DEHMA的熔喷材料抗菌改性及性能研究OA

Melt-blown air filtration materials can capture harmful microorganisms but risk releasing them as secondary pollutants.To address this problem,polypropylene(PP)melt-blown material was used as a substrate,onto which the quaternary ammonium salt antibacterial agent 2-(dimethylamino)ethyl methacrylate hexadecyl bromide(DEHMA),acrylic acid(AA),and silver(Ag)ions were sequentially grafted via chemical grafting,yielding two antibacterial ma-terials:PP-DEHMA-AA and PP-DEHMA-AA-Ag.Successful grafting was confirmed by scanning electron mi-croscopy(SEM),energy dispersive spectroscopy(EDS),Fourier transform infrared spectroscopy(FTIR),and X-ray photoelectron spectroscopy(XPS).After modification,distinct particles appeared on the material surface,and Br and Ag elements were detected by EDS.The modification did not significantly alter the crystalline structure of the PP substrate,as its characteristic diffraction peaks remained at 14.1°,17.9°,and 22.0°.Antibacterial tests showed that both modified materials exhibited excellent efficacy against Escherichia coli(E.coli)and Staphylococcus aureus(S.aureus).PP-DEHMA-AA achieved antibacterial rates of 98.95％and 99.15％against the two bacteria,respec-tively.PP-DEHMA-AA-Ag further improved these rates to 99.43％and 99.69％,and showed a faster bactericidal rate against S.aureus.This enhancement is attributed to a synergistic effect:DEHMA disrupts bacterial cell membranes via electrostatic interactions,while silver ions penetrate cells and impair enzyme activity.This study offers a viable ap-proach to developing high-efficiency antibacterial air filtration materials.