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Poly[ethylene-co-(acrylic acid)]-Based Nanocomposites: Thermal and Mechanical Properties and their Structural Characteristics Studied by Raman Spectroscopy

机译：聚[乙烯-共-（丙烯酸）]基纳米复合材料的热力学性能及其结构特征的拉曼光谱研究

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摘要

Nanocomposites containing carbon nanotubes (CNTs) as nanofillers and poly[ethylene-co-(acrylic acid)] (PEAA) or a polymer miscible mixture of PEAA and poly(2-ethyl-2-oxazoline) (PEOx) as a matrix were prepared by the solution-evaporation method with minimal damage to nanotubes. CNTs were prepared by chemical vapor deposition (CVD) with ethanol as the source of carbon. Raman spectroscopy confirmed the presence of single walled carbon nanotubes (SWNTs). High resolution transmission electron microscopy (HRTEM) showed the formation of multi walled carbon nanotubes (MWNTs). Thermal and mechanical properties of the nanocomposites were studied by analyzing samples containing different amounts of CNTs. The degree of crystallinity (X_c) of the PEAA-based nanocomposite containing a smaller amount of CNTs was larger (X_c = 17.0%) than both the one of pure PEAA (X_c = 14.6 %) and PEAA-based nanocomposite containing higher amounts of CNTs (X_c = 15.0%). The Young's modulus, ultimate stress, deformation at break, and toughness obtained from unidirectional tensile tests of the CNTs (1 wt%)-PEAA nanocomposite were higher than both the one of pure PEAA and CNTs (5 wt%)-PEAA nanocomposite. When a polymer mixture of PEAA/PEOx (containing 80 wt% of PEAA) was used as a matrix, a better mechanical response was also detected for nanocomposite containing 1 wt% CNTs. The nanocomposites containing small amounts of CNTs prepared here have potential to be used as coatings of metal or glass surfaces expecting a better mechanical performance than the one of pure matrix.
机译：制备了包含碳纳米管（CNT）作为纳米填料和聚[乙烯-共-（丙烯酸）]（PEAA）或PEAA与聚（2-乙基-2-恶唑啉）（PEOx）的聚合物混溶混合物的纳米复合材料通过溶液蒸发法对纳米管的损害最小。通过以乙醇为碳源的化学气相沉积（CVD）制备CNT。拉曼光谱法证实了单壁碳纳米管（SWNTs）的存在。高分辨率透射电子显微镜（HRTEM）显示了多壁碳纳米管（MWNT）的形成。通过分析包含不同数量的CNT的样品，研究了纳米复合材料的热和机械性能。包含少量CNT的PEAA基纳米复合材料的结晶度（X_c）大于纯PEAA（X_c = 14.6％）和包含更多CNTs的PEAA基纳米复合材料两者的结晶度（X_c = 17.0％） （X_c = 15.0％）。通过单向拉伸试验获得的CNTs（1 wt％）-PEAA纳米复合材料的杨氏模量，极限应力，断裂变形和韧性均高于纯PEAA和CNTs（5 wt％）-PEAA纳米复合材料中的一种。当使用PEAA / PEOx的聚合物混合物（包含80 wt％的PEAA）作为基质时，对于包含1 wt％CNT的纳米复合材料，还检测到更好的机械响应。此处制备的含有少量CNT的纳米复合材料具有用作金属或玻璃表面涂层的潜力，有望获得比纯基质更好的机械性能。

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