The mechanism of the solid state phase transitions in the polydiacetylene, poly-4bcmu: Thermal, x-ray diffraction and raman scattering studies

Z. Iqbal, N. S. Murthy, Y. P. Khanna, J. S. Szobota, R. A. Dalterio, F. J. Owens

Research output: Contribution to journalLetterpeer-review

18 Scopus citations

Abstract

The urethane-substituted, soluble polydiacetylene, poly-4BCMU, undergoes two discontinuous thermochromic phase transitions in the solid state from, the pristine greenish-blue to a red phase at approximately 110 degrees C and to a yellow phase at approximately 130 degrees C. These transitions have been investigated in polycrystalline samples using differential scanning calorimetry, X-ray powder diffraction and Raman scattering techniques. These results suggest that the transition at approximately 110 degrees C involves a loss of long-range order between the hydrogen-bonded sheets containing the polymer chains, but a two-dimensional order within the planes is preserved. The X-ray diffraction data show that the second transition at approximately 130 degrees C involves a complete loss of long-range order. Both transitions have been shown by Raman spectroscopy to be associated with a discontinuous reduction in the chain conjugation parameter.

Original languageEnglish (US)
Pages (from-to)4283-4295
Number of pages13
JournalJournal of Physics C: Solid State Physics
Volume20
Issue number27
DOIs
StatePublished - Sep 30 1987

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Engineering(all)
  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'The mechanism of the solid state phase transitions in the polydiacetylene, poly-4bcmu: Thermal, x-ray diffraction and raman scattering studies'. Together they form a unique fingerprint.

Cite this