High Performance Liquid Crystalline Polymers

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Physics and Theory".

Deadline for manuscript submissions: closed (31 October 2019) | Viewed by 5778

Special Issue Editors


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Guest Editor
New Jersey Institute of Technology, New Jersey Innovation Institute, Newark, NJ 07103, USA
Interests: biomaterials and high-performance polymers; polyester; liquid crystalline polymers (LCP)

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Guest Editor
Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH 44106, USA
Interests: polymeric biomaterials for drug delivery and regenerative medicine; nano- and micro-fiber fabrication; bio-mimicking approaches for polymer flammability mitigation; polymer packaging systems design; polyelectrolyte gels and elastomers; physiologically-mimicking macromolecular constructs with attention to primitive motile and irritable systems

Special Issue Information

Dear Colleagues,

The proposed Special Issue of Polymers is focused on liquid crystallinity, more generally mesophase formation in polymers. Liquid crystalline polymers, LCPs, were an intensive area of polymer research in the latter half of the 20th century, leading to the commercialization of high-performance fibers (Kevlar, Twaron, Vectran) and the novel high-performance plastic, Vectra. It was shown that all known low molar mass liquid crystalline textures were accessible to macromolecules, that liquid crystallinity was often noted in biological polymers, and a broad range of chemistries including mainchain and sidechain compositions forming LC phases in the melt, in solution or both were investigated. With the commercial applications of LCPs limited to specialty high-performance products, research interest waned and the intensity of LCP research declined over the past few decades. It is the purpose of this Special Issue to rekindle interest in this area of polymer science by reviewing the research accomplishments of the past, while providing a forum for new research currently in progress.

Prof. Michael Jaffe
Prof. Gary E. Wnek
Guest Editors

Manuscript Submission Information

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Keywords

  • Liquid crystalline polymer (LCP)
  • Mesophase
  • Mainchain LCP
  • Sidechain LCP
  • Thermotropic
  • Lyotropic
  • High performance

Published Papers (2 papers)

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Research

16 pages, 8866 KiB  
Article
Phase Structure Recording in a Nematic Side-Chain Liquid-Crystalline Polymer
by Ivan Budagovsky, Aleksey Kuznetsov, Sergey Shvetsov, Mikhail Smayev, Alexander Zolot’ko, Alexey Bobrovsky, Natalia Boiko and Valery Shibaev
Polymers 2020, 12(2), 356; https://0-doi-org.brum.beds.ac.uk/10.3390/polym12020356 - 6 Feb 2020
Cited by 4 | Viewed by 2100
Abstract
Dye-doped nematic side-chain liquid-crystalline polymers possess extraordinary large optical nonlinearity and ability to store the induced orientational deformations in a glassy state, which makes them a very promising material for photonic applications. In this study, the phase structures were generated and recorded in [...] Read more.
Dye-doped nematic side-chain liquid-crystalline polymers possess extraordinary large optical nonlinearity and ability to store the induced orientational deformations in a glassy state, which makes them a very promising material for photonic applications. In this study, the phase structures were generated and recorded in the bulk of a 50-μm layer of a nematic liquid-crystalline side-chain polymer, containing polyacrylate backbone, spacer having five methylene groups, and phenyl benzoate mesogenic fragment. The polymer was doped with KD-1 azodye. The director field deformations induced by the light beam close to the TEM01 mode were studied for different geometries of light–polymer interaction. The phase modulation depth of 2π was obtained for the 18-μm spacing between intensity peaks. The experimental data were analyzed based on the elastic continuum theory of nematics. The possibility to induce and record positive and negative microlenses in the polymer bulk was shown experimentally. Full article
(This article belongs to the Special Issue High Performance Liquid Crystalline Polymers)
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15 pages, 2836 KiB  
Article
Thermotropic Liquid Crystalline Polymers with Various Alkoxy Side Groups: Thermal Properties and Molecular Dynamics
by Gi Tae Park, Jin-Hae Chang and Ae Ran Lim
Polymers 2019, 11(6), 992; https://0-doi-org.brum.beds.ac.uk/10.3390/polym11060992 - 4 Jun 2019
Cited by 10 | Viewed by 3389
Abstract
Two series of thermotropic liquid-crystalline polymers (TLCPs) were synthesized by reacting various dialkoxy terephthalate units with hydroquinone (HQ) and 2,6-naphthalene diol (Naph). The dialkoxy terephthalate moieties used in this study include 2,5-diethoxyterephthalate, 2,5-dibutoxyterephthalate, and 2,5-dihexyloxy-terephthalate. All the TLCPs synthesized in this study formed [...] Read more.
Two series of thermotropic liquid-crystalline polymers (TLCPs) were synthesized by reacting various dialkoxy terephthalate units with hydroquinone (HQ) and 2,6-naphthalene diol (Naph). The dialkoxy terephthalate moieties used in this study include 2,5-diethoxyterephthalate, 2,5-dibutoxyterephthalate, and 2,5-dihexyloxy-terephthalate. All the TLCPs synthesized in this study formed nematic phases. The molecular motions according to the length of the dialkoxy side groups in the TLCPs were evaluated by 13C cross-polarization/magic angle spinning nuclear magnetic resonance spectroscopy. The thermal properties and molecular dynamics of the TLCPs are found to be affected by the length of the dialkoxy side group and the aromatic diol unit in the main chain. Further, the thermal behaviors, liquid crystalline mesophases, and degree of crystallinity of the two series of TLCPs, i.e., HQ- and Naph-TLCPs, are compared. Full article
(This article belongs to the Special Issue High Performance Liquid Crystalline Polymers)
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