Stretchable and strong cellulose nanopaper structures based on polymer-coated nanofiber networks: an alternative to nonwoven porous membranes from electrospinning.
Stretchable and strong cellulose nanopaper structures based on polymer-coated nanofiber networks: an alternative to nonwoven porous membranes from electrospinning.
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DOI：
10.1021/bm301105s
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发表时间：
2012-10
影响因子：
6.2
通讯作者：
H. Sehaqui;S. Morimune;T. Nishino;L. Berglund
中科院分区：
文献类型：
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作者：
H. Sehaqui;S. Morimune;T. Nishino;L. Berglund
基于电纺纤维的非织造膜在生物医学、过滤和防护服等应用中引起了极大的兴趣。机械性能差是一个限制，一些静电纺丝溶剂也是如此。为了解决这些问题，制备了基于经羟乙基纤维素（HEC）聚合物涂层改性的纳米原纤化纤维素（NFC）的多孔非织造膜。 NFC/HEC 水悬浮液以造纸方式进行简单的真空过滤，然后进行超临界 CO(2) 干燥。通过氮气吸附和 FE-SEM 分析，这些非织造纳米复合膜是真正的纳米结构，并表现出具有高比表面积的纳米多孔网络结构。通过拉伸测试评估的机械性能显示出高强度以及高达 55% 的极高失效应变。 XRD 分析表明，拉伸拉伸过程中原纤维发生了显着的重新排列。无序毡经过后拉伸后，模量和强度显着增加。目前的制备路线使用来自可再生资源的成分，对环境友好，并产生具有优异机械性能的渗透膜。
Nonwoven membranes based on electrospun fibers are of great interest in applications such as biomedical, filtering, and protective clothing. The poor mechanical performance is a limitation, as is some of the electrospinning solvents. To address these problems, porous nonwoven membranes based on nanofibrillated cellulose (NFC) modified by a hydroxyethyl cellulose (HEC) polymer coating are prepared. NFC/HEC aqueous suspensions are subjected to simple vacuum filtration in a paper-making fashion, followed by supercritical CO(2) drying. These nonwoven nanocomposite membranes are truly nanostructured and exhibit a nanoporous network structure with high specific surface area, as analyzed by nitrogen adsorption and FE-SEM. Mechanical properties evaluated by tensile tests show high strength combined with remarkably high strain to failure of up to 55%. XRD analysis revealed significant fibril realignment during tensile stretching. After postdrawing of the random mats, the modulus and strength are strongly increased. The present preparation route uses components from renewable resources, is environmentally friendly, and results in permeable membranes of exceptional mechanical performance.