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首页> 外文期刊>Journal of the Brazilian Chemical Society >Use of Amphiphilic Composites based on Clay/Carbon Nanofibers as Fillers in UHMWPE
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Use of Amphiphilic Composites based on Clay/Carbon Nanofibers as Fillers in UHMWPE

机译：基于粘土/碳纳米纤维的两亲性复合材料在UHMWPE中用作填料

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In this work, it is proposed a new strategy to improve the dispersion of inorganic fillers in polymeric matrices by producing surface carbon nanostructures. Clay/carbon nanofibers particles were prepared and used as fillers to improve the mechanical and thermal properties of ultra-high molecular weight polyethylene (UHMWPE). Thermogravimetry (TG), differential scanning calorimetry (DSC), elemental analyses, Raman, X-ray diffraction (XRD) and scanning electron microscopy (SEM) showed that chemical vapor deposition (CVD) with ethanol at different temperatures, i.e. 700, 800 and 900 ?°C with and without Fe catalyst, can be used to produce carbon (0.5-3.6 wt.%), mainly as nanofibers, on the clay surface. The use of these clay/carbon particles as fillers in UHMWPE at 1 and 3 wt.% produced an increase in the yield stress from 16 to ca. 20 MPa and Young modulus from 314 MPa for pure UHMWPE to values near 395-408 MPa. Moreover, the presence of the carbon/clay composites led to a strong improvement of the thermal properties of the UHMWPE increasing the decomposition Tonset (degradation start temperature) from 445 up to 472 ?°C. It was also observed by the crystallization enthalpies that the UHMWPE increased the crystallinity from 55 to 80-85% in the presence of the carbon composites. These results are discussed in terms of the strong interactions of the hydrophobic carbon nanostructures on the clay surface with the polymer hydrophobic chains.
机译：在这项工作中，提出了一种通过产生表面碳纳米结构来改善无机填料在聚合物基体中的分散性的新策略。制备了粘土/碳纳米纤维颗粒，并将其用作填料，以改善超高分子量聚乙烯（UHMWPE）的机械和热性能。热重法（TG），差示扫描量热法（DSC），元素分析，拉曼光谱，X射线衍射（XRD）和扫描电子显微镜（SEM）表明，乙醇在不同温度（即700、800和在有或没有铁催化剂的情况下，可在900°C下用于在粘土表面上生产碳（0.5-3.6 wt。％），主要作为纳米纤维。在UHMWPE中以1和3 wt。％的比例使用这些粘土/碳颗粒作为填料时，屈服应力从16增加到了大约1。对于纯UHMWPE，从314 MPa到20 MPa和杨氏模量，直到395-408 MPa附近。此外，碳/粘土复合材料的存在导致UHMWPE的热性能大大提高，从而使分解Tonset（降解起始温度）从445提高到472°C。通过结晶焓还观察到，在碳复合物的存在下，UHMWPE将结晶度从55增加到80-85％。根据粘土表面上的疏水碳纳米结构与聚合物疏水链的强相互作用来讨论这些结果。

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