Thermally recordable cholesteric liquid crystalline copolymers containing pendant menthyl and cholesteryl groups

Po Chih Yang, Jui-Hsiang Liu

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In order to investigate the effect of spacer length and linkages between the rigid mesogenic core and the terminal group on the molecular interaction and physical properties of polymers, a series of novel side chain liquid crystalline polymers were synthesized. These were composed of liquid crystalline monomers with six or eleven methylene segments as spacers, and chiral monomers end capped with menthyl or cholesteryl groups. Liquid crystalline phases of the polymers were investigated using differential scanning calorimetry and polarized optical microscopy, and confirmed with X-ray diffractometry. Color image recording of the synthesized polymer films was achieved using a thermal treatment, and then fixed by quenching. This investigation demonstrates that the introduction of carbonate linking groups between the rigid mesogenic core and terminal group decreases both the lateral molecular interaction and thermal stability of the liquid crystalline polymers. The RGB reflection colors of the cholesteric composite film could be tuned by varying the film temperature and applying an external field. The results of this investigation present significant scientific and practical contributions with respect to the development of unique cholesteric polymer materials.

Original languageEnglish
Article number4670080
Pages (from-to)369-376
Number of pages8
JournalIEEE/OSA Journal of Display Technology
Volume4
Issue number4
DOIs
Publication statusPublished - 2008 Dec 1

Fingerprint

copolymers
Polymers
Molecular interactions
Copolymers
Liquid crystal polymers
Crystalline materials
polymers
Liquids
liquids
Monomers
Image recording
Color
Carbonates
Composite films
molecular interactions
Polymer films
spacers
X ray diffraction analysis
Optical microscopy
Differential scanning calorimetry

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

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abstract = "In order to investigate the effect of spacer length and linkages between the rigid mesogenic core and the terminal group on the molecular interaction and physical properties of polymers, a series of novel side chain liquid crystalline polymers were synthesized. These were composed of liquid crystalline monomers with six or eleven methylene segments as spacers, and chiral monomers end capped with menthyl or cholesteryl groups. Liquid crystalline phases of the polymers were investigated using differential scanning calorimetry and polarized optical microscopy, and confirmed with X-ray diffractometry. Color image recording of the synthesized polymer films was achieved using a thermal treatment, and then fixed by quenching. This investigation demonstrates that the introduction of carbonate linking groups between the rigid mesogenic core and terminal group decreases both the lateral molecular interaction and thermal stability of the liquid crystalline polymers. The RGB reflection colors of the cholesteric composite film could be tuned by varying the film temperature and applying an external field. The results of this investigation present significant scientific and practical contributions with respect to the development of unique cholesteric polymer materials.",
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Thermally recordable cholesteric liquid crystalline copolymers containing pendant menthyl and cholesteryl groups. / Yang, Po Chih; Liu, Jui-Hsiang.

In: IEEE/OSA Journal of Display Technology, Vol. 4, No. 4, 4670080, 01.12.2008, p. 369-376.

Research output: Contribution to journalArticle

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AB - In order to investigate the effect of spacer length and linkages between the rigid mesogenic core and the terminal group on the molecular interaction and physical properties of polymers, a series of novel side chain liquid crystalline polymers were synthesized. These were composed of liquid crystalline monomers with six or eleven methylene segments as spacers, and chiral monomers end capped with menthyl or cholesteryl groups. Liquid crystalline phases of the polymers were investigated using differential scanning calorimetry and polarized optical microscopy, and confirmed with X-ray diffractometry. Color image recording of the synthesized polymer films was achieved using a thermal treatment, and then fixed by quenching. This investigation demonstrates that the introduction of carbonate linking groups between the rigid mesogenic core and terminal group decreases both the lateral molecular interaction and thermal stability of the liquid crystalline polymers. The RGB reflection colors of the cholesteric composite film could be tuned by varying the film temperature and applying an external field. The results of this investigation present significant scientific and practical contributions with respect to the development of unique cholesteric polymer materials.

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