The Preparation And Characterization Of Antibacterial And Antistatic EVA/starch Composite Foaming Materials

With the wide use of EVA foaming materials, it’s necessary to develop antibacterial and antistatic materials. In our paper, antibacterial and antistatic EVA/starch composite foaming materials were prepared and characterized. EVA/starch composite foaming materials containing silver-loaded antibacterial powder and EVA/starch composite foaming materials filled with carbon black-carbon fiber were prepared through melt blending and compression molding. EVA/starch composite foaming materials supported nano-silver was prepared by in-situ reduction.The foaming composites were characterized by means of FT-IR, the activation index studies, melt flow rate (MFR) tests, thermogravimetric analysis (TGA), mechanical property measurements, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy analysis (XPS), energy dispersive X-ray analysis (EDS), antibacterial ratio tests and resistivity test.For EVA/starch composite foaming materials containing silver-loaded antibacterial powder, the effect of modified powder was analyzed by FT-IR. Activation index tests showed the modifying effects was improved along with coupling agent, the effect of titanate coupling agent is the most obvious. The physical and mechanical properties of the composite foaming materials were improved when antibacterial powders were added. The SEM showed the powders were well dispersed in the matrix. The cell size was smaller when powders were added. Antibacterial ratio of the materials could be up to 99%.For EVA/starch composite foaming materials supported nano-silver, elemental silver was confirmed by XPS. SEM photo showed the well dispersion of nano-silver particles and the surface content of silver was 8.49% according to EDS. The materials also have antibacterial properties.For EVA/starch composite foaming materials filled with carbon black-carbon fiber, the antistatic effect of the materials filled with carbon black-carbon fiber was better than the materials filled with carbon black. The physical and mechanical properties of the materials were decreased when the conductive fillers were added. When the conductive fillers attained certain content, the surface resistivity of the materials was lower than 107Ω. It had achieved the antistatic performance requirements.