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首页> 外文期刊>Nanotechnology >Estimation of degree of polymerization of poly-acrylonitrile-grafted carbon nanotubes using Guinier plot of small angle x-ray scattering
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Estimation of degree of polymerization of poly-acrylonitrile-grafted carbon nanotubes using Guinier plot of small angle x-ray scattering

机译：使用小角度X射线散射的Guinier曲线估计聚丙烯腈 - 接枝碳纳米管的聚合程度

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摘要

Small angle x-ray scattering (SAXS) was used to estimate the degree of polymerization of polymer-grafted carbon nanotubes (CNTs) synthesized using a 'grafting from' method. This analysis characterizes the grafted polymer chains without cleaving them from CNTs, and provides reliable data that can complement conventional methods such as thermogravimetric analysis or transmittance electron microscopy. Acrylonitrile was polymerized from the surface of the CNTs by using redox initiation to produce poly-acrylonitrile-grafted CNTs (PAN-CNTs). Polymerization time and the initiation rate were varied to control the degree of polymerization. Radius of gyration (R-g) of PAN-CNTs was determined using the Guinier plot obtained from SAXS solution analysis. The results showed consistent values according to the polymerization condition, up to a maximum R-g = 125.70 A whereas that of pristine CNTs was 99.23 A. The dispersibility of PAN-CNTs in N,N-dimethylformamide was tested using ultraviolet-visible-near infrared spectroscopy and was confirmed to increase as the degree of polymerization increased. This analysis will be helpful to estimate the degree of polymerization of any polymer-grafted CNTs synthesized using the 'grafting from' method and to fabricate polymer/CNT composite materials.
机译：使用小角度X射线散射（SAX）来估计使用“从”方法合成的聚合物接枝碳纳米管（CNT）的聚合度。该分析表征了移植的聚合物链，而不从CNT切割它们，并提供可靠的数据，可以补充常规方法，例如热重分析或透射电子显微镜。通过使用氧化还原引发将丙烯腈从CNT的表面聚合以产生聚丙烯腈接枝的CNT（PAN-CNT）。聚合时间和起始速率变化以控制聚合度。使用从SAXS溶液分析中获得的豚鼠曲线测定PAN-CNT的旋转半径（R-G）。结果根据聚合条件显示一致的值，直到最大RG = 125.70甲而其原始CNT的是99.23 A.在N- PAN-CNT的分散性，N-二甲基甲酰胺，用紫外 - 可见光 - 近红外光谱测试随着聚合程度的增加，被证实增加。该分析将有助于估计使用“从”方法的“接枝”和制造聚合物/ CNT复合材料合成的任何聚合物接枝CNT的聚合程度。

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