高强高韧超支化聚酰胺胺/氧化石墨烯仿贝壳复合膜

Strong and tough nacre-like composite film from hyperbranched poly(amido amine)and graphene oxide

文章采用超支化聚合物聚酰胺胺(HPAMAM)和氧化石墨烯(graghene oxide,GO),通过真空抽滤自组装的方法制备了仿贝壳复合材料,并对其用京尼平进行了适当的交联。采用透射电子显微镜(transmission electron microscope,TEM)对GO进行了表征,采用红外光谱(infrared spectroscopy,IR)、扫描电子显微镜(scanning electron microscope,SEM)、X-射线衍射仪(X-ray diffraction,XRD)和电子万能试验机对HPAMAM/GO复合膜的结构和力学性能进行了表征。结果表明:HPAMAM/GO复合膜呈现出类似于贝壳的"砖"和"泥浆"排列的层状结构;随HPAMAM在复合膜中质量分数的提高,复合膜的延展性不断提高;在交联后,G-HPAMAM/GO复合膜的力学性能显著提高,拉伸强度约为150 MPa;复合膜保持了很高的韧性,其断裂伸长率高达10%以上。因此HPAMAM在构筑高强高韧仿贝壳复合材料方面具有非常高的研究价值。

In this paper, nacre-like composite films were fabricated from hyperbranched poly（amido amine） （HPAMAM） and graphene oxide（GO） through vacuum-aid filtration. And these films were cross-linked by genipin. The structure of GO was characterized by transmission electron microscope（TEM）. The structural and mechanical properties of HPAMAM/GO composite films were characterized by attenuated total reflec- tance-Fourier transform infrared spectroscopy（ATR-FTIR）, scanning electron microscope（SEM）, X-ray diffraction（XRD） and electronic universal testing machine. The results showed that the HPAMAM/GO com- posite films were of well-defined layered structure of ＂brick＂ and ＂mortar＂ hierarchical structure. With the in- crease of HPAMAM in the composite film, the extensibility of the film increased. After cross-linking, the mechanical properties of G-HPAMAM/GO film were dramatically enhance＆ The tensile strength of genipin cross-linked HPAMAM/GO film was about 150 MPa. Moreover, the composite film remained high tough- ness. The elongation at break was more than 10%. HPAMAM was of great value in fabricating high strength and high toughness nacre-like composites.