Lyotropic liquid crystallinity of amylose tris(alkylcarbamates): Cholesteric and smectic phase formation in different solvents

• Oyamada, Keiko

• Terao, Ken

• Suwa, Masayori

• Kitamura, Shinichi

• Sato, Takahiro

Abstract

Oyamada K., Terao K., Suwa M., et al. Lyotropic liquid crystallinity of amylose tris(alkylcarbamates): Cholesteric and smectic phase formation in different solvents. Macromolecules, 46(11), 4589-4595, May 20, 2013. Copyright © 2013, American Chemical Society. https://doi.org/10.1021/ma400787c.

Lyotropic liquid crystallinity was investigated for amylose tris(n-butylcarbamate) (ATBC), amylose tris(ethylcarabamate) (ATEC), and amylose tris(n-hexylcarbamate) (ATHC) in tetrahydrofuran (THF) and ethyl lactates (ELs) by using phase separation experiments, polarized microscopic observation, small-angle X-ray diffraction, and circular dichroism measurements. Concentrated THF solution of ATBC has selective reflection at visible light wavelength, indicating the formation of cholesteric phase. A current theory well explains the phase diagram of ATBC, ATEC, and ATHC in THF. On the other hand, ELs solution forms smectic phase and it has significantly different phase diagram, that is, the biphasic range is much wider than that in THF. In other words, highly concentrated smectic phase can be obtained from semidilute and rather low viscosity ELs solution. This is likely because amylose alkylcarbamate chains may have significant anisotropic intermolecular attractive interaction in between polymer chains in ELs or intermolecular interactions between the chain ends are much more different from those in THF. © 2013 American Chemical Society.

Journal

• Macromolecules

  Macromolecules 46 (11), 4589-4595, 2013-05-20

  American Chemical Society

Keywords

• Materials Chemistry
• Inorganic Chemistry
• Polymers and Plastics
• Organic Chemistry

Details

• CRID: 1050018218947491200
• NII Article ID: 120007089688
• NII Book ID: AA0071963X
• DOI: 10.1021/ma400787c
• ISSN: 15205835
• ISSN: 00249297
• HANDLE: 11094/81836
• Web Site: https://pubs.acs.org/doi/pdf/10.1021/ma400787c
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN