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首页> 外文期刊>Journal of Applied Polymer Science >Shear flow-induced orientation and structural recovery of multiwalled carbon nanotube in poly(ethylene oxide) matrix
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Shear flow-induced orientation and structural recovery of multiwalled carbon nanotube in poly(ethylene oxide) matrix

机译：剪切流诱导的聚环氧乙烷基体中多壁碳纳米管的取向和结构恢复

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摘要

In the present work we studied the flow induced multiwalled carbon nanotube (MWCNT) orientation and the mechanisms governing the kinetics of nanotube reorientation and three-dimensional network restructuring in poly(ethylene oxide) (PEO)/MWCNT nanocomposites. For this purpose, the linear and nonlinear viscoelastic experiments including frequency sweep, time sweep and transient tests were performed on PEO/MWCNT samples varying in MWCNT content. The extent as well as kinetics of network restructuring was found to be strongly dependent upon the amount of preshearing (shear rate and shearing time) and MWCNT concentration. The results also showed two mechanisms for structural recovery; a fast restructuring at the beginning due to rejoining of clusters and unoriented adjacent nanotube and much slower recovery in the longer annealing times due to Brownian motion. The latter mechanism was found to be uncompleted over 3600 s annealing. This was supported by a(ij) (orientation tensors) calculated based on transmission electron micrograph. (C) 2015 Wiley Periodicals, Inc.
机译：在目前的工作中，我们研究了流动诱导的多壁碳纳米管（MWCNT）取向以及控制聚环氧乙烷（PEO）/ MWCNT纳米复合材料中纳米管重新取向和三维网络重构动力学的机理。为此，对MWCNT含量变化的PEO / MWCNT样品进行了线性和非线性粘弹性实验，包括频率扫描，时间扫描和瞬态测试。发现网络重组的程度和动力学很大程度上取决于预剪切的量（剪切速率和剪切时间）和MWCNT浓度。结果还显示出两种结构恢复机制;由于团簇和未取向的相邻纳米管的重新结合，开始时快速重组，而由于布朗运动，在较长的退火时间内恢复速度要慢得多。发现后一机制在3600 s的退火过程中仍未完成。这由基于透射电子显微图计算的a（ij）（取向张量）支持。 （C）2015年Wiley Periodicals，Inc.

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