Article

Spectroscopic analysis and kinetics of intermolecular hydrogen bond formation in poly-pyridobisimidazole (M5) fiber

  1. A. Andres Leal1,2,
  2. Joseph M. Deitzel1,
  3. Steven H. McKnight3,
  4. John W. Gillespie Jr.1,2,4,*

Article first published online: 3 AUG 2009

DOI: 10.1002/polb.21767

Issue

Journal of Polymer Science Part B: Polymer Physics

Journal of Polymer Science Part B: Polymer Physics

Volume 47, Issue 18, pages 1809–1824, 15 September 2009

Additional Information

How to Cite

Leal, A. A., Deitzel, J. M., McKnight, S. H. and Gillespie, J. W. (2009), Spectroscopic analysis and kinetics of intermolecular hydrogen bond formation in poly-pyridobisimidazole (M5) fiber. J. Polym. Sci. B Polym. Phys., 47: 1809–1824. doi: 10.1002/polb.21767

Author Information

  1. 1

    Center for Composite Materials (UD-CCM), University of Delaware, Newark, Delaware 19716

  2. 2

    Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716

  3. 3

    Department of Civil and Environmental Engineering, University of Delaware, Newark, Delaware 19716

  4. 4

    Materials Division, Army Research Laboratory, Aberdeen, Maryland 21005

*Center for Composite Materials (UD-CCM), University of Delaware, Newark, Delaware 19716

Publication History

  1. Issue published online: 3 AUG 2009
  2. Article first published online: 3 AUG 2009
  3. Manuscript Accepted: 6 JUN 2009
  4. Manuscript Revised: 19 MAY 2009
  5. Manuscript Received: 10 MAY 2008

Funded by

  • Composite Materials Technology (CMT)
  • U.S. Army Research Laboratory under Cooperative Agreement. Grant Number: DAAD19-01-2-0005

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Keywords:

  • annealing;
  • fibers;
  • hydrogen bonding;
  • infrared spectroscopy;
  • poly-pyridobisimidazole

Abstract

Poly-pyridobisimiazole (M5) single filaments subjected to varying degrees of heat treatment have been analyzed using Fourier Transform Infrared (FTIR) microspectroscopy in transmission mode to detect changes in the state of intermolecular hydrogen bonding as a function of fiber annealing conditions. The FTIR absorbance bands associated with hydrogen bonding in M5 fiber have been identified, and the integrated molar absorption coefficients for the bands of interest have been determined experimentally, which allows to quantify the concentration of N[BOND]H vibration groups hydrogen-bonded (H-bonded) to water molecules, and the concentration of N[BOND]H vibration groups H-bonded to adjacent polymer chains in the fiber. A dual mechanism kinetic rate expression is used to describe intermolecular H-bond formation in M5 fiber as a function of annealing conditions, from which an activation energy for H-bond formation of 14.8 kJ/mol is obtained. © 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 1809–1824, 2009

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