PlumX Metrics
Embed PlumX Metrics

Chemical structure and local segmental dynamics in 1,2-polybutadiene

Macromolecules, ISSN: 0024-9297, Vol: 36, Issue: 13, Page: 4954-4959
2003
  • 52
    Citations
  • 0
    Usage
  • 13
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    52
    • Citation Indexes
      52
  • Captures
    13

Article Description

The segmental dynamics in 1,2-polybutadiene was studied over a broad range of temperature and pressure using dielectric spectroscopy. The glass transition temperature was found to be strongly dependent on pressure (dT/dP = 240 K/GPa). Moreover, while no appreciable change in the shape of the relaxation function with pressure was observed for spectra compared at a fixed value of the relaxation time, the fragility (T-normalized temperature dependence) increased with pressure. From the ratio of the isochronal to isobaric expansivities, and consistently from the ratio of the isochoric and isobaric activation energies, temperature was found to exert a stronger influence on the dynamics than does the volume. This is similar to results for other polymers as well as small molecule glass-formers (when the latter lack hydrogen bonds). Finally, a comparison was made of the properties of 1,2-PBD with those of other vinyl polymers having different pendent groups. The different segmental dynamics reflect the manner in which local relaxation is governed by intermolecular cooperativity. Consistent with this interpretation, 1,2-PBD exhibits an activation volume more than 9 times the molar volume of its repeat unit; this is significantly larger than the values for the other vinyl polymers.

Bibliographic Details

C. M. Roland; R. Casalini; P. Santangelo; M. Sekula; J. Ziolo; M. Paluch

American Chemical Society (ACS)

Chemistry; Materials Science

Provide Feedback

Have ideas for a new metric? Would you like to see something else here?Let us know