功能化石墨烯-碳纳米管协同强韧化HDPE纳米复合材料的制备和性能

发布时间：2019-08-05 13:31

【摘要】：使用L-天门冬氨酸连接氧化石墨烯和酸化多壁碳纳米管(WMCNT-COOH)合成杂化材料LGC,然后用纳米填料LGC填充马来酸酐接枝高密度聚乙烯(HDPE-g-MAH),用熔融共混法制备了LGC/HDPE-g-MAH纳米复合材料。对LGC杂化填料和LGC/HDPE-g-MAH纳米复合材料进行了红外分析(FTIR)、拉曼光谱分析(Raman)、X射线衍射分析(XRD)、扫描电子显微镜分析(SEM)、示差扫描量热仪分析(DSC)、热失重分析(TGA)、动态热机械分析(DMA)和力学性能测试,研究了LGC含量对LGC/HDPE-g-MAH纳米复合材料性能的影响。结果表明:L-天门冬氨连接了GO和WMCNT-COOH,三者通过酰胺键连接在一起形成LGC杂化材料。LGC杂化材料内部官能团(氨基或羧基等)与聚合物基体中的羧基发生相互作用,改善了基体与填料之间的界面。根据DMA分析,损耗因子的变化证实了LGC与基体分子链之间强烈的相互作用。热学分析结果表明:纳米复合材料的结晶温度、熔融温度和热稳定性能都提高了。力学分析表明:随着LGC含量的增加,复合材料的拉伸强度和冲击强度呈现出先增大后降低的趋势;当LGC含量为0.5%和0.75%(质量分数)时,复合材料的冲击强度和拉伸强度分别比HDPE-g-MAH提高了95.9%和62.4%。
[Abstract]:L-aspartic acid was used to connect the graphene and the acidified multi-wall carbon nanotubes (WMCNT-COOH) to synthesize the hybrid material LGC, then the maleic acid and the high-density polyethylene (HDPE-g-MAH) was filled with the nano-filler LGC, and the LGC/ HDPE-g-MAH nanocomposite was prepared by the melt blending method. The infrared analysis (FTIR), Raman spectroscopy (Raman), X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were carried out on the LGC hybrid filler and the LGC/ HDPE-g-MAH nanocomposite. The effect of LGC content on the properties of LGC/ HDPE-g-MAH nanocomposite was studied by dynamic thermal mechanical analysis (DMA) and mechanical property test. The results show that L-aspartic acid is linked to GO and WMCNT-COOH, and the three are linked together through the amine bond to form the LGC hybrid material. The internal functional group (amino group or base group, etc.) of the LGC hybrid material interacts with the base in the polymer matrix to improve the interface between the matrix and the filler. According to the DMA analysis, the change of the loss factor confirms the strong interaction between the LGC and the matrix molecular chain. The results of thermal analysis show that the crystallization temperature, melting temperature and thermal stability of the nanocomposite are improved. The mechanical analysis shows that with the increase of the content of LGC, the tensile strength and impact strength of the composites show a tendency to decrease. When the content of LGC is 0.5% and 0.75% (mass fraction), the impact strength and tensile strength of the composite are 95.9% and 62.4% higher than that of HDPE-g-MAH, respectively.
【作者单位】：西华大学材料科学与工程学院;四川大学高分子科学与工程学院;
【分类号】：TQ325.1+4

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