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Published on: March 12, 2010

High-temperature behavior of cellulose I.

James F Matthews1, Malin Bergenstråhle, Gregg T Beckham

  • 1Biosciences Center, National Renewable Energy Laboratory, Golden, Colorado, USA. James.Matthews@nrel.gov

The Journal of Physical Chemistry. B
|February 23, 2011
PubMed
Summary

High-temperature heating of cellulose Iβ microfibrils reveals a shift from 2D to 3D hydrogen bonding. This structural change, driven by hydroxymethyl group conformation, eliminates microfibril twist and explains experimental observations.

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Area of Science:

  • Biomolecular Science
  • Materials Science
  • Computational Chemistry

Background:

  • Cellulose Iβ is a crystalline polysaccharide with a characteristic 2D hydrogen-bonded network.
  • Understanding cellulose's structural behavior at elevated temperatures is crucial for its applications.

Purpose of the Study:

  • To investigate the high-temperature structural behavior of hydrated cellulose Iβ microfibrils using molecular simulations.
  • To elucidate the role of hydrogen bonding and hydroxymethyl group conformation in high-temperature cellulose structures.

Main Methods:

  • Molecular dynamics simulations were performed on small hydrated cellulose Iβ microfibrils.
  • Two carbohydrate force fields were employed to model the system.
  • Analysis focused on hydrogen bond networks and hydroxymethyl group conformations.

Main Results:

  • At 227 °C (500 K), a 3D hydrogen bond network forms, replacing the 2D network.
  • Hydroxymethyl groups change conformation (TG to GG or GT), enabling the 3D network.
  • The 3D network eliminates microfibril twist, unlike the 2D network.

Conclusions:

  • The high-temperature phase of cellulose Iβ exhibits a 3D hydrogen bond network.
  • This structural transition provides a molecular basis for experimental observations like H/D exchange and diffraction patterns.
  • The findings offer insights into cellulose's behavior under thermal stress.