Orientation of cellulose nanocrystals in electrospun polymer fibres
Orientation of cellulose nanocrystals in electrospun polymer fibres
复制标题
电纺聚合物纤维中纤维素纳米晶体的取向
DOI：
10.1007/s10853-015-9409-y
复制
发表时间：
2015
影响因子：
4.5
通讯作者：
Wanasekara N
中科院分区：
文献类型：
--
作者：
Wanasekara N
采用静电纺丝法成功制备了含有纤维素纳米晶的聚苯乙烯和聚乙烯醇纳米纤维。了解静电纺丝纤维中纳米碳纤维的局部取向对于理解和利用其力学性能至关重要。利用透射电子显微镜（TEM）和拉曼光谱研究了这些静电纺丝纤维中的CNCs的取向。位于~1095 cm-1处的拉曼谱带与纤维素主链的C-O环拉伸相关，用于定量纤维内CNC的取向。使用理论模型拟合拉曼光谱以表征取向程度。从这些数据中可以观察到，CNC沿着平行于纤维轴的方向几乎没有沿着取向。从纳米纤维的TEM图像中的纤维中的CNCs的定向和非定向区域的证据。这些结果与之前在该领域发表的工作相矛盾，微观力学建模计算表明电纺聚合物纤维中的CNCs具有均匀的取向。它表明，这解释了为什么静电纺丝纤维垫含有CNC的机械性能并不总是相同的，将被预期为一个完全定向的系统。
Polystyrene and poly(vinyl alcohol) nanofibres containing cellulose nanocrystals (CNCs) were successfully produced by electrospinning. Knowledge of the local orientation of CNCs in electrospun fibres is critical to understand and exploit their mechanical properties. The orientation of CNCs in these electrospun fibres was investigated using transmission electron microscopy (TEM) and Raman spectroscopy. A Raman band located at ~1095 cm−1, associated with the C–O ring stretching of the cellulose backbone, was used to quantify the orientation of the CNCs within the fibres. Raman spectra were fitted using a theoretical model to characterize the extent of orientation. From these data, it is observed that the CNCs have little orientation along the direction parallel to the axis of the fibres. Evidences for both oriented and non-oriented regions of CNCs in the fibres are presented from TEM images of nanofibres. These results contradict previously published work in this area and micromechanical modelling calculations suggest a uniform orientation of CNCs in electrospun polymer fibres. It is demonstrated that this explains why the mechanical properties of electrospun fibre mats containing CNCs are not always the same as that would be expected for a fully oriented system.
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