Orientation of the alkyl side chains and glucopyranose rings in Langmuir-Blodgett films of a regioselectively substituted cellulose ether

Wakako Kasai, Keisuke Tsutsumi, Mitsuhiro Morita, Tetsuo Kondo

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

An arrangement for the long alkyl side chains in a Langmuir-Blodgett (LB) film from regioselectively alkylated 2,3-di-O-octadecylcellulose on an Au-coated substrate was investigated using Fourier transform infrared reflection absorbance spectroscopy. The IR results indicated that the hydrophobic long alkyl side chains were forced to be repellent to the surface of water, resulting in deposition on the substrate, with it being tilted in the vertical direction, and further formed both hexagonal and orthorhombic crystalline structures up to 10 layers in the LB film. In addition, molecular modeling with CAChe software indicated that the optimized assembly of the side chains was supposed to own a vertical arrangement against the substrate surface after compression of the monolayer. This means that the conformation of 21 screw of the cellulose molecular chain may be altered by the compression to have an unusual conformation by a different φ-ψ dihedral angle such as onefold axis without a symmetry element.

Original languageEnglish
Pages (from-to)707-712
Number of pages6
JournalColloid and Polymer Science
Volume286
Issue number6-7
DOIs
Publication statusPublished - Jun 2008

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

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