偶联剂对EVOH/纳米SiO_2复合材料结构与性能的影响  

The effects of coupling agents on the structure and properties of the EVOH/nano-SiO_2 composites

作　　者：刘跃军[1] 刘亦武[1] 魏珊珊[1] 

机构地区：[1]湖南工业大学包装新材料与技术重点实验室,湖南株洲412008

出　　处：《功能材料》2010年第7期1176-1180,1185,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(10672197;10972076);湖南省杰出青年基金资助项目(07JJ1001);湖南省科技计划资助项目(2009GK3127);湖南工业大学研究生创新基金资助项目(CX0903)

摘　　要：采用不同的偶联剂KH550、KH560、KH570和KH8431对纳米SiO2进行表面改性,采用熔融共混法将未改性和改性纳米SiO2(5%(质量分数)SiO2)与EVOH共混制成复合材料,并吹塑成薄膜。利用FT-IR、TEM、SEM对不同偶联剂处理的纳米SiO2和复合材料的结构进行表征,并对复合材料的流变性能、阻隔性能、力学性能、耐热性能和透明性进行了表征。结果表明,纳米SiO2与4种偶联剂均形成化学键合,改性纳米SiO2比未改性纳米SiO2在EVOH中分散性好,加工时熔体的流动性更好。用KH550处理的纳米SiO2在EVOH中分散性最好,与EVOH能形成较大界面相互作用力,与EVOH/未改性纳米SiO2复合材料相比,EVOH/改性纳米SiO2复合材料的拉伸强度和储能模量分别提高17.2%和136%,透湿、透氧系数分别下降11.2%和9.5%,透光率达到74.9%,雾度为14.9%。The unmodified nano-SiO2 and organic modified nano-SiO2 （5wt% SiO2） which was treated with KH550,KH560,KH570 and KH8431 were used to prepare EVOH /SiO2 nano-composites,and the composites were blown to film later.Nano-SiO2 treated by different silane coupling agents were characterized and analyzed by FT-IR and TEM,and the structure of the composites was analyzed by SEM.The rheological behaviors,mechanical properties,barrier properties,thermal properties and transparency of the composites were characterized too.The results show that：chemical bonds were formed between nano-SiO2 and the four silane coupling agents,and the organic modified nano-SiO2 had a better dispersion and processability than unmodified nano-SiO2 in the EVOH.In contrast,nano-SiO2 treated with KH550 had the best dispersion and interaction force with EVOH.Compared to the composites prepared by unmodified nano-SiO2,the tensile strength and storage modulus of the composites prepared by organic modified nano-SiO2 increased by 17.2% and 136%,and the moisture permeance factor and oxygen permeability coefficient decreased by 11.2% and 9.5% respectively,and the light transmission rate was 74.9%,fog degree was 14.89%.

关 键 词：EVOH 纳米SiO_2 偶联剂 阻隔性能 纳米复合材料 

分 类 号：TQ33[化学工程—橡胶工业]