吹膜工艺对EVOH/纳米SiO_2复合材料结构及性能的影响  

The Effect of Film-Blowing Process on the Structure and Properties of the EVOH/Nano-SiO_2 Composite

作　　者：刘亦武[1] 刘跃军[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412007

出　　处：《高分子材料科学与工程》2011年第7期107-110,共4页Polymer Materials Science & Engineering

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(07JJ1001);湖南省科技计划项目(2009GK3127);湖南工业大学研究生创新基金(CX0903)

摘　　要：采用熔融共混法制备了乙烯-乙烯醇共聚物(EVOH)/纳米SiO2复合材料,用不同的吹膜工艺对复合材料进行吹膜。通过偏光显微镜(POM)、差示扫描量热分析仪(DSC)、X射线衍射仪(XRD)测试对比了不同吹膜工艺制备的复合材料的结晶行为,并对复合材料的力学性能、阻隔性能和透明性进行了表征。研究发现,不同吹膜工艺改变了EVOH/纳米SiO2复合材料薄膜结构的有序程度(取向度、结晶度、高分子链的排列)、结晶形态等,使薄膜的力学性能、阻隔性能及光学性能得到明显的改善,当SiO2的质量比m(SiO2)/m(EVOH)=5/100时最为突出,透湿、透气系数最大可下降54.2%、64.4%;拉伸强度最大可提高67.3%。Ethylene-vinyl alcohol copolymer（EVOH）/ SiO2 nano-composites were prepared by melt blending and blown to film with different film-blowing processes.The crystallization behavior of the nanocomposites prepared by different film-blowing processes was analyzed through polarizing microscope（POM）,differential scanning calorimetry（DSC） and X-ray diffraction（XRD）.The mechanical properties,barrier properties,and transparency of the EVOH/SiO2 composites were characterized.Test results show that： different film-blowing processes can change the ordered structure（orientation,crystallinity） and crystalline form of the EVOH/SiO2 nano-composites film,so that the mechanical properties,barrier properties and optical properties of the films are significantly improved.When m（SiO2）/m（EVOH）=5/100,the moisture permeability coefficient of EVOH/SiO2 composite film decreases 54.2%,the oxygen permeability coefficient of EVOH/SiO2 composite film decreases 64.4%;and the tensile strength increases 67.3%.

关 键 词：乙烯-乙烯醇共聚物 纳米SIO2 吹膜工艺 阻隔性能 

分 类 号：TB383[一般工业技术—材料科学与工程]