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Microfluidic Wet Spinning of Core-Sheath Elastomer-Liquid Crystal Fibers
Honaker, Lawrence William; Vats, Shameek; Anyfantakis, Emmanouil et al.
201946th German Liquid Crystal Conference
 

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Keywords :
liquid crystal; polymer; fiber; spinning; textile
Abstract :
[en] Liquid crystals encapsulated in fibers have a wide variety of applications in sensing. In order to produce these, several methods have been explored. Electrospinning is among the better-known techniques with considerable successes. Only a limited range of polymers, though, has been used for electrospinning with liquid crystal cores, and the process of electrospinning has many obstacles to its utility at an industrial scale. On the other hand, wet-spinning techniques are better suited for industrial applications and are widely used in textile manufacturing, but are not commonly used for coaxial fiber production, especially with the large experimental scales that are difficult to replicate in a standard liquid crystal research laboratory. We therefore propose a method for wet-spinning coaxial core-sheath liquid crystal-filled elastomer fibers using a microfluidic set-up. Based on the flow-focusing method used for the production of liquid crystal shells and emulsions, this technique generates coaxial filaments by pumping a core-sheath flow of a liquid crystal surrounded by a rubbery polymer solution into a co-flowing coagulation bath. The coagulation bath is tuned to quickly extract the elastic polymer solution solvent, leaving behind a dry, continuous fiber. We have employed this method to produce fibers of polybutadiene and polyisoprene containing a core of a liquid crystal, such as 4-cyano-4'-pentylbiphenyl (5CB). Investigations into the choice of polymer solution, i.e. both the polymer and solvents used, will be presented in addition to discussion on parameters affecting the contiguity of the core.
Disciplines :
Physics
Author, co-author :
Honaker, Lawrence William ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Vats, Shameek ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Anyfantakis, Emmanouil ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Lagerwall, Jan  ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
External co-authors :
no
Language :
English
Title :
Microfluidic Wet Spinning of Core-Sheath Elastomer-Liquid Crystal Fibers
Publication date :
29 March 2019
Event name :
46th German Liquid Crystal Conference
Event organizer :
University of Paderborn
Event place :
Paderborn, Germany
Event date :
27-03-2019 to 29-03-2019
Audience :
International
Name of the research project :
INTERACT
Funders :
FNR - Fonds National de la Recherche [LU]
Available on ORBilu :
since 19 June 2019

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