Preparation And Properties Of LLDPE/Nano-ZnO Antibacterial Composite Films And Composites

The research on high performance and multi founctionali/.ation of linear low-density polyethylene (LLDPE) widely used has attracted great interest in recent year. Nano-ZnO possesses higher antibacterial property and lower cost, as well outstanding effect of enhancing strength, toughness. Thus LLDPE/nano-ZnO antibacterial composite films and LLDPE/nano-ZnO composites will show a good development prospects. In this paper, nano-ZnO was surface-modified using KH550and KH560under different situations of modification. Then. LLDPE/nano-ZnO antibacterial films were prepared by LLDPE and nano-ZnO modified through melt blending and blowing, while LLDPE/nano-ZnO composites were prepared by LLDPE and nano-ZnO modified through melt blending, extruding and jet-molding. SEM and DSC of the materials were analyzed. The effct of amount of nano-ZnO, kinds and amount of silane and amount of ethanol on mechanical, antibacterial, transparent, rheological and thermal properties of the films and the composites was studied.For the antibacterial composite films, the results show that the effect of nano-ZnO’s modification can be enhanced, adding properly amount of silane. Compared with LLDPE, the tensile strength and elongation at break of the composite films are enhanced by43.21%,39.42%at KH550’s content of5wt%[mKH550/(mZnO+mKH550)]. With a few amounts-of nano-ZnO, outstanding antibacterial properties are granted to composite films. The antibacterial rate of the composite films against colibacillus reaches91.69%and against staphylococcus reaches95.62%at modified nano-ZnO content of0.8wt%.For the LLDPE/nano-ZnO composites, the results indicated that nano-ZnO particles well disperse in the LLDPE matrix at KH550-modified nano-ZnO content of0.3wt%. The compositive mechanical properties of LLDPE can be improved effectively with an appropriate amount of modified nano-ZnO. Especially, the compositive properties of composites are enhanced most remarkably at KH550’s content of5wt%[mKH550/(mZnO+mKH550)]. Besides Vicat softening temperature of LLDPE is slightly enhanced.