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首页> 外文期刊>Journal of Materials Science >Effects of POSS functionalization of carbon nanotubes on microstructure and thermomechanical behavior of carbon nanotube/polymer nanocomposites
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Effects of POSS functionalization of carbon nanotubes on microstructure and thermomechanical behavior of carbon nanotube/polymer nanocomposites

机译：碳纳米管对碳纳米管微观结构和热机械性能的影响碳纳米管/聚合物纳米复合材料的影响

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摘要

Surface modification of carbon nanotubes (CNTs) is a promising method to control the properties of a CNT/polymer system. Recent research has been directed toward chemical attachment of polyhedral oligomeric silsesquioxane (POSS) moieties to the CNT surface. POSS modification of CNTs can affect both the quality of CNT dispersion in the matrix and the interactions between polymer chains and nanotubes at the interphase region. The goal of the current study is to investigate these effects. Accordingly, nanocomposites containing POSS-modified CNTs, unmodified CNTs, and POSS were fabricated by infusion of 0.25, 0.5, and 1.0 wt% particles into a vinyl ester (VE) resin. Mechanical and thermal properties of experimental materials were evaluated using three-point bending, differential scanning calorimetry, and thermogravimetric analysis methods. The state of particle distribution/dispersion in VE matrix was also observed. Optical microscopic studies showed that both POSS/VE and CNT/VE nanocomposites possess local agglomeration. This was more extensive in CNT/VE system. However, CNT-POSS/VE systems showed a fine-textured microstructure with homogeneous distribution of CNT-POSS hybrids into VE resin. This indicates that the dispersibility of CNTs improved due to POSS functionalization. Scanning electron microscopy (SEM) of fracture surfaces revealed apparent de-bonding of agglomerates from the matrix in both POSS/VE and CNT/VE system, which is in agreement with the observed drop in their fracture strain. On the other hand, SEM studies of nanocomposites containing POSS-modified nanotubes revealed formation of a 3D network of well-dispersed CNT-POSS hybrids. SEM analysis further indicated the occurrence of a fracture mechanism with enhanced interactions between individual CNTs and VE matrix. This stiff and flexible network of individual CNTs is responsible for enhancement in elastic modulus, glass transition, and thermal decomposition temperatures of CNT-POSS/VE nanocomposites.
机译：碳纳米管（CNT）的表面改性是控制CNT /聚合物体系的性质的有希望的方法。最近的研究旨在向CNT表面上的多面体低聚体蛋白酶（POSS）部分的化学附着。 CNT的POSS改性可以影响基质中CNT分散体的质量和聚合物链和纳米管之间的相互作用在邻间区域。目前研究的目标是调查这些效果。因此，纳米复合材料含有可改性的CNT，未改性的CNT，并通过输注0.25,0.5和1.0wt％颗粒在乙烯基酯（Ve）树脂中制造。使用三点弯曲，差示扫描量热法和热重分析方法评估实验材料的机械和热性能。还观察到颗粒分布/分散的状态。光学微观研究表明，POSS / VE和CNT / VE纳米复合材料两者都具有局部附聚。这在CNT / VE系统中更广泛。然而，CNT-POSS / VE系统显示出细微纹理的微观结构，具有CNT-POSS杂交物的均匀分布进入VE树脂。这表明CNT的分散性由于足够的功能化而改善。扫描电子显微镜（SEM）的裂缝表面揭示了来自POSS / VE和CNT / VE系统中的基质中的附聚物的明显脱键，这与其断裂菌株的观察到下降一致。另一方面，含有足够修饰的纳米管的纳米复合材料的SEM研究揭示了形成良好分散的CNT-POTS杂种的3D网络的形成。 SEM分析进一步表明了具有各个CNT和VE基质之间具有增强的相互作用的断裂机制的发生。这种刚性和灵活的单独CNT网络负责CNT-POSS / VE纳米复合材料的弹性模量，玻璃转变和热分解温度的增强。

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