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.

© 2008 IEEE

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  1. K. Ichimura, "Photoalignment of liquid-crystal systems," Chem. Rev. 100, 1847-1874 (2000).
  2. A. Y. Bobrovsky, N. I. Boiko, V. P. Shibaev, J. Springer, "New chiral nematic materials with photovariable helical supramolecular structure for reversible optical data recording," Adv. Mater. 12, 1180-1183 (2000).
  3. A. Natansohn, P. Rochon, X. Meng, C. Barret, T. Buffeteau, S. Bonenfant, "Molecular addressing? Selective photoinduced cooperative motion of polar ester groups in copolymers containing azobenzene groups," Macromolecules 31, 1155-1161 (1998).
  4. K. Suzuki, H. Saito, M. Tokita, J. Watanabe, "Development of co-continuous structure in liquid crystalline polyester," Polymer 46, 8313-8320 (2005).
  5. A. W. De Jeu, G. Verteugen, Thermotropic Liquid Crystals. Fundamental (Springer-Verlag, 1977).
  6. C. Ruslim, K. Ichimura, "Conformational effect on macroscopic chirality modification of cholesteric mesophases by photochromic azobenzene dopants," J. Phys. Chem. B 104, 6529-6535 (2000).
  7. D. Demus, J. Goodby, G. W. Gray, H. W. Spiess, V. Vill, Handbook of Liquid Crystals (Wiley-VCH, 1998).
  8. E. B. Barmatov, A. Y. Bobrovsky, D. A. Pebalk, M. V. Barmatova, V. P. Shibaev, "Cholesteric mesophase of the hydrogen-bonded blends of liquid crystalline ionogenic copolymers with a low molecular weight chiral dopant," J. Polym. Sci. Part A: Polym. Chem. 37, 3215-3225 (1999).
  9. P. Van de witte, J. C. Galan, J. Lub, "Modification of the pitch of chiral nematic liquid crystals by means of photoisomerization of chiral dopants," Liq. Cryst. 24, 819-827 (1998).
  10. V. P. Shibaev, V. I. Kopp, A. Z. Genack, "Photonic materials based on mixtures of cholesteric liquid crystals with polymers," J. Phys. Chem. B 107, 6961-6964 (2003).
  11. N. Hoshino, Y. Matsuoka, K. Okamoto, A. Yamagishi, "$\Delta-[{\hbox{Ru}}({\rm acac})_{2}{\rm L}]$$({\rm L}={\rm a}\ {\rm mesogenic}\ {\rm derivative}\ {\rm of}\ {\rm bpy})$ as a novel chiral dopant for nematic liquid crystals with large helical twisting power," J. Amer. Chem. Soc. 125, 1718-1719 (2003).
  12. J. H. Liu, C. D. Hsieh, H. Y. Wang, "Preparation and characterization of chiral polyacrylates end-capped with bornyl groups in the side chains," J. Polym. Sci. Part A: Polym. Chem. 42, 1075-1092 (2004).
  13. J. H. Liu, P. C. Yang, "Synthesis and characterization of novel monomers and polymers containing chiral (-)-menthyl groups," Polymer 47, 4925-4935 (2006).
  14. P. C. Yang, J. H. Liu, "Synthesis and characterization of novel photoisomerizable liquid crystalline polymers containing cinnamoyl groups," J. Polym. Sci. Part A: Polym. Chem. 46, 1289-1303 (2008).
  15. J. H. Liu, P. C. Yang, Y. H. Chiu, Y. Suda, "Synthesis and characterization of novel liquid-crystalline copolymers containing thermally stable photochromic groups," J. Polym. Sci. Part A: Polym. Chem. 45, 2026-2037 (2007).
  16. T. H. Lin, Y. J. Chen, C. H. Wu, Y. G. Fuh, J. H. Liu, P. C. Yang, "Cholesteric liquid crystal laser with wide tuning capability," Appl. Phys. Lett. 86, 161120-161123 (2005).
  17. J. H. Liu, P. C. Yang, Y. K. Wang, C. C. Wang, "Optical behavior of cholesteric liquid crystal cells with novel photoisomerizable chiral dopants," Liq. Cryst. 33, 237-248 (2006).
  18. I. Dierking, Textures of Liquid Crystals (Wiley-VCH, 2003).
  19. M. Brehmer, J. Lub, P. Van de witte, "Light-induced color change of cholesteric copolymers," Adv. Mater. 10, 1438-1441 (1998).
  20. D. Demus, J. Goodby, G. Grey, H. Spiess, V. Vill, Handbook of Liquid Crystals (Wiley, 1998).
  21. V. Shibaev, A. Bobrovsky, N. Boiko, "Photoactive liquid crystalline polymer systems with light-controllable structure and optical properties," Prog. Polym. Sci. 28, 729-836 (2003).
  22. V. A. Mallia, N. Tamaoki, "Photoresponsive vitrifiable chiral dimesogens: Photo-thermal modulation of microscopic disordering in helical superstructure and glass-forming properties," J. Mater. Chem. 13, 219 (2003).
  23. A. E. Blatch, I. D. Fletcher, G. R. Luckhurst, "Symmetric and non-symmetric liquid crystal dimers with branched terminal alkyl chains: Racemic and chiral," J. Mater. Chem. 7, 9 (1997).
  24. R. A. M. Hikmet, H. Kemperman, Nature 392, 476-479 (1998).

2008 (1)

P. C. Yang, J. H. Liu, "Synthesis and characterization of novel photoisomerizable liquid crystalline polymers containing cinnamoyl groups," J. Polym. Sci. Part A: Polym. Chem. 46, 1289-1303 (2008).

2007 (1)

J. H. Liu, P. C. Yang, Y. H. Chiu, Y. Suda, "Synthesis and characterization of novel liquid-crystalline copolymers containing thermally stable photochromic groups," J. Polym. Sci. Part A: Polym. Chem. 45, 2026-2037 (2007).

2006 (2)

J. H. Liu, P. C. Yang, "Synthesis and characterization of novel monomers and polymers containing chiral (-)-menthyl groups," Polymer 47, 4925-4935 (2006).

J. H. Liu, P. C. Yang, Y. K. Wang, C. C. Wang, "Optical behavior of cholesteric liquid crystal cells with novel photoisomerizable chiral dopants," Liq. Cryst. 33, 237-248 (2006).

2005 (2)

T. H. Lin, Y. J. Chen, C. H. Wu, Y. G. Fuh, J. H. Liu, P. C. Yang, "Cholesteric liquid crystal laser with wide tuning capability," Appl. Phys. Lett. 86, 161120-161123 (2005).

K. Suzuki, H. Saito, M. Tokita, J. Watanabe, "Development of co-continuous structure in liquid crystalline polyester," Polymer 46, 8313-8320 (2005).

2004 (1)

J. H. Liu, C. D. Hsieh, H. Y. Wang, "Preparation and characterization of chiral polyacrylates end-capped with bornyl groups in the side chains," J. Polym. Sci. Part A: Polym. Chem. 42, 1075-1092 (2004).

2003 (4)

V. Shibaev, A. Bobrovsky, N. Boiko, "Photoactive liquid crystalline polymer systems with light-controllable structure and optical properties," Prog. Polym. Sci. 28, 729-836 (2003).

V. A. Mallia, N. Tamaoki, "Photoresponsive vitrifiable chiral dimesogens: Photo-thermal modulation of microscopic disordering in helical superstructure and glass-forming properties," J. Mater. Chem. 13, 219 (2003).

V. P. Shibaev, V. I. Kopp, A. Z. Genack, "Photonic materials based on mixtures of cholesteric liquid crystals with polymers," J. Phys. Chem. B 107, 6961-6964 (2003).

N. Hoshino, Y. Matsuoka, K. Okamoto, A. Yamagishi, "$\Delta-[{\hbox{Ru}}({\rm acac})_{2}{\rm L}]$$({\rm L}={\rm a}\ {\rm mesogenic}\ {\rm derivative}\ {\rm of}\ {\rm bpy})$ as a novel chiral dopant for nematic liquid crystals with large helical twisting power," J. Amer. Chem. Soc. 125, 1718-1719 (2003).

2000 (3)

K. Ichimura, "Photoalignment of liquid-crystal systems," Chem. Rev. 100, 1847-1874 (2000).

A. Y. Bobrovsky, N. I. Boiko, V. P. Shibaev, J. Springer, "New chiral nematic materials with photovariable helical supramolecular structure for reversible optical data recording," Adv. Mater. 12, 1180-1183 (2000).

C. Ruslim, K. Ichimura, "Conformational effect on macroscopic chirality modification of cholesteric mesophases by photochromic azobenzene dopants," J. Phys. Chem. B 104, 6529-6535 (2000).

1999 (1)

E. B. Barmatov, A. Y. Bobrovsky, D. A. Pebalk, M. V. Barmatova, V. P. Shibaev, "Cholesteric mesophase of the hydrogen-bonded blends of liquid crystalline ionogenic copolymers with a low molecular weight chiral dopant," J. Polym. Sci. Part A: Polym. Chem. 37, 3215-3225 (1999).

1998 (4)

P. Van de witte, J. C. Galan, J. Lub, "Modification of the pitch of chiral nematic liquid crystals by means of photoisomerization of chiral dopants," Liq. Cryst. 24, 819-827 (1998).

A. Natansohn, P. Rochon, X. Meng, C. Barret, T. Buffeteau, S. Bonenfant, "Molecular addressing? Selective photoinduced cooperative motion of polar ester groups in copolymers containing azobenzene groups," Macromolecules 31, 1155-1161 (1998).

M. Brehmer, J. Lub, P. Van de witte, "Light-induced color change of cholesteric copolymers," Adv. Mater. 10, 1438-1441 (1998).

R. A. M. Hikmet, H. Kemperman, Nature 392, 476-479 (1998).

1997 (1)

A. E. Blatch, I. D. Fletcher, G. R. Luckhurst, "Symmetric and non-symmetric liquid crystal dimers with branched terminal alkyl chains: Racemic and chiral," J. Mater. Chem. 7, 9 (1997).

Adv. Mater. (2)

A. Y. Bobrovsky, N. I. Boiko, V. P. Shibaev, J. Springer, "New chiral nematic materials with photovariable helical supramolecular structure for reversible optical data recording," Adv. Mater. 12, 1180-1183 (2000).

M. Brehmer, J. Lub, P. Van de witte, "Light-induced color change of cholesteric copolymers," Adv. Mater. 10, 1438-1441 (1998).

Appl. Phys. Lett. (1)

T. H. Lin, Y. J. Chen, C. H. Wu, Y. G. Fuh, J. H. Liu, P. C. Yang, "Cholesteric liquid crystal laser with wide tuning capability," Appl. Phys. Lett. 86, 161120-161123 (2005).

Chem. Rev. (1)

K. Ichimura, "Photoalignment of liquid-crystal systems," Chem. Rev. 100, 1847-1874 (2000).

J. Amer. Chem. Soc. (1)

N. Hoshino, Y. Matsuoka, K. Okamoto, A. Yamagishi, "$\Delta-[{\hbox{Ru}}({\rm acac})_{2}{\rm L}]$$({\rm L}={\rm a}\ {\rm mesogenic}\ {\rm derivative}\ {\rm of}\ {\rm bpy})$ as a novel chiral dopant for nematic liquid crystals with large helical twisting power," J. Amer. Chem. Soc. 125, 1718-1719 (2003).

J. Mater. Chem. (2)

V. A. Mallia, N. Tamaoki, "Photoresponsive vitrifiable chiral dimesogens: Photo-thermal modulation of microscopic disordering in helical superstructure and glass-forming properties," J. Mater. Chem. 13, 219 (2003).

A. E. Blatch, I. D. Fletcher, G. R. Luckhurst, "Symmetric and non-symmetric liquid crystal dimers with branched terminal alkyl chains: Racemic and chiral," J. Mater. Chem. 7, 9 (1997).

J. Phys. Chem. B (2)

V. P. Shibaev, V. I. Kopp, A. Z. Genack, "Photonic materials based on mixtures of cholesteric liquid crystals with polymers," J. Phys. Chem. B 107, 6961-6964 (2003).

C. Ruslim, K. Ichimura, "Conformational effect on macroscopic chirality modification of cholesteric mesophases by photochromic azobenzene dopants," J. Phys. Chem. B 104, 6529-6535 (2000).

J. Polym. Sci. Part A: Polym. Chem. (4)

E. B. Barmatov, A. Y. Bobrovsky, D. A. Pebalk, M. V. Barmatova, V. P. Shibaev, "Cholesteric mesophase of the hydrogen-bonded blends of liquid crystalline ionogenic copolymers with a low molecular weight chiral dopant," J. Polym. Sci. Part A: Polym. Chem. 37, 3215-3225 (1999).

J. H. Liu, C. D. Hsieh, H. Y. Wang, "Preparation and characterization of chiral polyacrylates end-capped with bornyl groups in the side chains," J. Polym. Sci. Part A: Polym. Chem. 42, 1075-1092 (2004).

P. C. Yang, J. H. Liu, "Synthesis and characterization of novel photoisomerizable liquid crystalline polymers containing cinnamoyl groups," J. Polym. Sci. Part A: Polym. Chem. 46, 1289-1303 (2008).

J. H. Liu, P. C. Yang, Y. H. Chiu, Y. Suda, "Synthesis and characterization of novel liquid-crystalline copolymers containing thermally stable photochromic groups," J. Polym. Sci. Part A: Polym. Chem. 45, 2026-2037 (2007).

Liq. Cryst. (2)

J. H. Liu, P. C. Yang, Y. K. Wang, C. C. Wang, "Optical behavior of cholesteric liquid crystal cells with novel photoisomerizable chiral dopants," Liq. Cryst. 33, 237-248 (2006).

P. Van de witte, J. C. Galan, J. Lub, "Modification of the pitch of chiral nematic liquid crystals by means of photoisomerization of chiral dopants," Liq. Cryst. 24, 819-827 (1998).

Macromolecules (1)

A. Natansohn, P. Rochon, X. Meng, C. Barret, T. Buffeteau, S. Bonenfant, "Molecular addressing? Selective photoinduced cooperative motion of polar ester groups in copolymers containing azobenzene groups," Macromolecules 31, 1155-1161 (1998).

Nature (1)

R. A. M. Hikmet, H. Kemperman, Nature 392, 476-479 (1998).

Polymer (2)

K. Suzuki, H. Saito, M. Tokita, J. Watanabe, "Development of co-continuous structure in liquid crystalline polyester," Polymer 46, 8313-8320 (2005).

J. H. Liu, P. C. Yang, "Synthesis and characterization of novel monomers and polymers containing chiral (-)-menthyl groups," Polymer 47, 4925-4935 (2006).

Prog. Polym. Sci. (1)

V. Shibaev, A. Bobrovsky, N. Boiko, "Photoactive liquid crystalline polymer systems with light-controllable structure and optical properties," Prog. Polym. Sci. 28, 729-836 (2003).

Other (4)

D. Demus, J. Goodby, G. Grey, H. Spiess, V. Vill, Handbook of Liquid Crystals (Wiley, 1998).

I. Dierking, Textures of Liquid Crystals (Wiley-VCH, 2003).

A. W. De Jeu, G. Verteugen, Thermotropic Liquid Crystals. Fundamental (Springer-Verlag, 1977).

D. Demus, J. Goodby, G. W. Gray, H. W. Spiess, V. Vill, Handbook of Liquid Crystals (Wiley-VCH, 1998).

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