尼龙11/热膨胀石墨纳米复合材料的制备与表征(英文)

Preparation and Characterization of Nylon 11/Thermally Expanded Graphite Nanocomposites

采用直接熔融共混的方法制备了尼龙11/热膨胀石墨纳米复合材料,用X射线衍射(XRD)、热重分析(TGA)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、拉伸和电导率测试等手段研究了尼龙11/热膨胀石墨(PA11/TEG)纳米复合材料的微观结构和性能。结果表明,石墨的高温热处理能有效剥离石墨片层,单独的石墨片层厚度达到100 nm左右。在熔融共混中,石墨片层以平均20 nm的厚度均匀分散于PA11基体中。TGA测试表明,TEG的加入改善了PA11的耐热性能。力学性能测试结果表明,当加入2%(重量比)的TEG,尼龙11/热膨胀石墨纳米复合材料的弹性模量和屈服强度与纯PA11相比分别提高了149%和34.5%。电导率测试表明,复合材料的渗逾阀值为1.0%。TEG在PA11基体中的良好分散在改善材料性能中起到重要左右。

Nanocomposites based on nylon 11（PA11） and thermally expanded graphite（TEG） were prepared by direct melt compounding.Scanning electron microscope（SEM）,transmission electron microscope（TEM） and X-ray diffraction（XRD） characterization showed that graphite nanosheets were dispersed in nanoscale in the PA11 matrix,and the resulted PA11/TEG nanocomposites exhibited a completely intercalated nanostructure.Thermogravimetric analysis（TGA） showed that the incorporation of TEG could improve the thermal stability of the nanocomposites.Mechanical testing showed that compared with neat PA11,the elastic modulus and the yield strength of the composite were greatly improved by about 149% and 34.5% respectively,with incorporating only 2% wt.TEG.Electrical conductivity of PA11 was notably enhanced by introduction of TEG.Nanocomposites with extremely low（1.0 wt.% TEG） percolation threshold were successfully obtained.In general,the degree of dispersion of TEG within polymer matrix played a vital role in property improvement.