Self-assembled, optically responsive nematic liquid crystal/polymer core-shell fibers: Formation and characterization

被引：60
作者：
Buyuktanir, Ebru A. [1 ]
Frey, Margaret W. [2 ]
West, John L. [1 ]
机构：
[1] Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA
[2] Cornell Univ, Ithaca, NY 14853 USA
来源：
POLYMER | 2010年 / 51卷 / 21期
关键词：
Electrospinning; Liquid crystal/polymer composites; Optoelectronic fibers; POLY(LACTIC ACID); CRYSTAL; CRYSTALLIZATION; NANOFIBERS; BEHAVIOR; FILMS;
D O I：
10.1016/j.polymer.2010.08.011
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
We report here the formation and structural characterization of optically responsive, highly birefringent electrospun nematic liquid crystal (LC) microfibers. The LC microfibers are electrospun from a solution of polylactic acid (PLA) and low molecular weight 4-pentyl-4-cyanobiphenyl (5CB) in chloroform/acetone solvent. In the electrospinning process, the low molecular weight 5CB phase-separates and self-assembles to form a planarly aligned nematic core within a PLA shell. The solubility limit of 5CB in PLA and the degree of phase separation of LC in the 5CB/PLA core/sheath fibers is determined using the phase transition enthalpies associated with LC and polymer components. Structural analysis revealed that the LC core and dissolved LC in the fibers promote the formation of the alpha-form of PLA crystals and increase the degree of crystallinity of the PLA shell in 5CB/PLA fibers from 6.6% to 52%. Competition between 5CB droplet formation and PLA fiber formation is observed as a function of spinning solution composition and applied electrospinning voltage. Alignment of the 5CB within the PLA core is confirmed by polarizing optical microscopy. (C) 2010 Elsevier Ltd. All rights reserved.
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收藏
页码：4823 / 4830
页数：8
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