Porous microfibers by the electrospinning of amphiphilic graft copolymer solutions with multi-walled carbon nanotubes
Porous microfibers by the electrospinning of amphiphilic graft copolymer solutions with multi-walled carbon nanotubes
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DOI：
10.1016/j.polymer.2012.08.058
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发表时间：
2012-11-09
期刊：
影响因子：
4.6
通讯作者：
Mallon, Peter E.
中科院分区：
文献类型：
--
作者：
Bayley, Gareth M.;Mallon, Peter E.
合成了聚丙烯腈-接枝-聚（二甲基硅氧烷）（PAN-g-PDMS）的接枝共聚物，并研究了这些材料从二甲基甲酰胺（DMF）溶液静电纺丝的情况。接枝共聚物的两亲性质诱导静电纺丝溶液中分子的相分离和自组装，形成网状结构。研究表明自组装对影响最终纤维形态的静电纺丝参数有直接影响。分子的两亲性质导致多孔微纤维的形成。多孔纤维通常是通过选择性去除聚合物共混物的共电纺溶液中的聚合物组分来获得的，然而，这项工作提出了一种获得高度多孔电纺纤维的新颖且直接的途径。多壁碳纳米管（MWCNT）也成功地在两亲性接枝共聚物溶液中进行静电纺丝。包含多壁碳纳米管可产生直径小得多的纤维，但纤维的多孔结构得以保留。纳米管沿着静电纺丝纤维轴获得了优异的分散和排列。展示了如何将多孔静电纺丝纤维用作生产多孔碳纤维的前体材料。 (C) 2012 Elsevier Ltd. 保留所有权利。
Graft copolymers of polyacrylonitrile-graft-poly(dimethyl siloxane) (PAN-g-PDMS) were synthesized and the solution electrospinning of these materials from dimethylformamide (DMF) was investigated. The amphiphilic nature of the graft copolymers induced phase segregation and self-assembly of the molecules in the electrospinning solution to form a network-like structure. The self-assembly was shown to have a direct effect on the electrospinning parameters affecting the final fiber morphology. The amphiphilic nature of the molecules led to the formation of porous microfibers. Porous fibers are usually obtained via the selective removal of a polymer component in a co-electrospun solution of polymer blends, however, this works presents a novel and direct route for obtaining highly porous electrospun fibers. Multi-walled carbon nanotubes (MWCNT) were also successfully electrospun in the amphiphilic graft copolymer solutions. The inclusion of MWCNT's produces fibers with much smaller diameters, but the porous structure of the fibers is maintained. Excellent dispersion and alignment of the nanotubes along the electrospun fiber axis were obtained. It is shown how the porous electrospun fibers can be used as precursor materials for the production of porous carbon fibers. (C) 2012 Elsevier Ltd. All rights reserved.