聚丙烯/聚丙烯-石墨烯交替多层复合材料的结构及气体阻隔性能

Structure and Gas Barrier Properties of Polypropylene/Polypropylene-Graphene Alternating Multilayered Composites

利用多层共挤出技术制备了具有规整的交替层状结构的聚丙烯/聚丙烯-石墨烯(PP/PP-GR)交替多层复合材料,通过光学显微镜、扫描电子显微镜、气体渗透实验、力学性能测试研究了PP/PP-GR交替多层复合材料的结构与性能的关系。结果表明,分层叠加单元对复合材料施加的使熔体变宽变薄的"类双向拉伸"作用促进了石墨烯在PP中的分散、剥离和取向,从而使PP/PP-GR交替多层复合材料在低GR含量(体积分数0.082%)下同时具有高气体阻隔性(氧气渗透系数为1.01×10^-15 cm^3·cm/(cm^2·s·Pa))和高断裂伸长率(1080.1%)。

Polypropylene/polypropylene-graphene(PP/PP-GR)alternating multilayer composites with regular alternating layer structure were prepared by multi-layer coextrusion technology.The relationship between the structure and properties of PP/PP-GR alternating multilayer composites was studied by optical microscope,scanning electron microscope,gas permeation experiment and mechanical property test.The results show that the"biaxial stretching like"effect of laminating-multiplying elements on the composite materials makes the melt wider and thinner,and promotes the dispersion,exfoliation and orientation of GR in PP,which makes the PP/PP-GR alternating multilayer composites show both high gas barrier properties(oxygen permeability coefficient of 1.01×10^-15 cm^3·cm/(cm^2·s·Pa))and a high elongation at break(1080.1%)even with the low content of GR(volume fraction of 0.082%).