摘要
本文利用氯化锂/N,N-二甲基乙酰胺(LiCl/DMAc)溶解纤维素,并与改性、未改性的纳米TiO_2进行共混,采用溶胶-凝胶法制备可降解纤维素包装膜。通过红外光谱对改性前后纳米材料的结构进行表征,测试纤维素包装膜的拉伸强度及断裂伸长率,并进行热失重分析;使用扫描电镜和原子力显微镜观察其表面结构。结果表明:改性纳米TiO_2比未改性纳米材料在纤维素膜中的分散更均匀,当改性纳米TiO_2与纤维素混合比例为0.5:100时,纤维素包装膜的拉伸强度和断裂伸长率分别为25.6MPa和125%,较加入未改性纳米TiO_2的纤维素膜拉伸强度提高了1.45倍,断裂伸长率是原来的1.35倍。
Regenerated cellulose packaging films filled with nano titanium dioxide(TiO_2) were prepared by LiCl/DMAc solvent system and sol-gel method.The molecule structure of modified TiO_2,the morphology,thermal and physical properties of the films were investigated by Fourier transform infrared spectroscopy(FTTR),scanning electron microscope(SEM),Atomic Force Microscopy(AFM),thermogravi-metric analysis(TGA) and universal tensile test machine.FTIR rusults indicated that the nano TiO_2 is successfully modified by KH - 550.AFM and SEM showed the modified nano TiO_2/cellulose films have dense structures and nano materials dispersed in films homogenously.The tensile strength and elongation at break of cellulose films could be up to 25.6MPa and 125%when the mixing ratio of modified nano TiO_2 and cellulse is 0.5:100. And the composite films have better thermal stability than the pure cellulose.
出处
《中国印刷与包装研究》
CAS
2012年第2期67-72,共6页
China Printing Materials Market
基金
国家"十一五"科技支撑计划项目--农产品物流包装与标准化技术研究(No.2006BAD30B02)
