Abstract: A cinnamic aldehyde/βcyclodextrin complex was prepared by saturated aqueous solution method, then the complex was added to a PLA aqueous solution. The obtained solution was electrospun to a PLA/cinnamic aldehyde composite membrane. The effects of weight ratio of acetone to N,NDimethyl formamide (DMF)，PLA concentration, applied voltage, distance of needle to collector on the diameter of the nanofiber and morphology of membrane were investigated by scanning electron microscope (SEM). The functional groups of the composite membrane were analyzed via fourier transform infrared spectrum (FTIR). The thermodynamic, mechanical, and antibacterial properties of the composite membrane were studied. The result showed that the average diameter of nanofiber in the composite membrane was 175 nm, thermal decomposition temperature was 265.52 ℃, the tensile strength was 245 MPa. FTIR showed that the interaction between cinnamic aldehyde and PLA was physical in nature. The composite membrane possessed an antibacterial ability to Escherichia coli, Staphylococcus aureus and Bacillus subtilis.

Key words: cinnamic aldehyde, composite nanofiber membrane, polylactic acid, electrostatic spinning