Rigid helical conformation of Curdlan tris(phenylcarbamate) in solution

• Ochiai, Takaaki

• Nakamura, Yasuko

• Yoshikawa, Chiaki

• Sato, Takahiro

• Terao, Ken

Abstract

Light and small-angle X-ray scattering and viscosity measurements were made for four curdlan tris(phenylcarbamate) (CdTPC) samples having quite narrow dispersity indices (DI) and ranging in the molecular weight between 6×10^4 and 2×10^6, to determine weight-average molecular weights Mw, radii of gyration <S^2>, particle scattering functions P(q), and intrinsic viscosities [η] in tetrahydrofuran (THF) and 4-methyl-2-pentanone (MIBK). Size exclusion chromatography equipped with light scattering and/or viscosity detectors was performed for some broad DI samples in THF also to determine <S^2> and [η] as a function of M_w. The solution data were analyzed in terms of the wormlike-chain model to estimate the Kuhn segment length of 57 nm in THF and 17 nm in MIBK and the helix pitch per residue h of 0.39 nm in THF and 0.51 nm in MIBK. Since the former h value is almost equivalent to that for single helical curdlan and its acetate derivative in crystal, it is reasonably suggested that the local conformation of CdTPC in THF is close to the tightly wound helix stabilized by the intramolecular hydrogen bonding, which was detected from the solution IR spectra.

Journal

• Polymer

  Polymer 53 (18), 3649-3950, 2012-08-17

  Elsevier BV

Keywords

• Polysaccharide derivative
• hydrogen bond
• chain stiffness

Details

• CRID: 1050299693928041728
• NII Article ID: 120005316305
• NII Book ID: AA11537383
• DOI: 10.1016/j.polymer.2012.07.004
• HANDLE: 11094/25934
• ISSN: 00323861
• Web Site: https://api.elsevier.com/content/article/PII:S003238611200571X?httpAccept=text/xml
• Web Site: https://api.elsevier.com/content/article/PII:S003238611200571X?httpAccept=text/plain
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN