Effect of thermal history on the microstructure of a poly(tetramethylene oxide)-based polyurea

Alicia M. Castagna, Autchara Pangon, Gregory P. Dillon, James Runt

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The role of thermal history on the nanoscale segregated structure of a bulk polymerized polyurea containing oligomeric poly(tetramethylene oxide) soft segments is investigated in the present study. Temperature-dependent unlike segment demixing was explored in two series of experiments: at constant heating (and cooling) rate and on annealing at selected elevated temperatures. Tapping mode atomic force microscopy on the as-polymerized polymer demonstrates that the polyurea hard segments self-assemble into a ribbon-like morphology that is generally preserved on annealing, although ribbon coarsening was observed at the highest annealing temperature. The results from the constant heating rate synchrotron X-ray scattering experiments demonstrate that the nanoscale structure begins to reorganize at temperatures as low as ∼70 C, and the very significant changes in mean interdomain spacing observed at much higher temperatures are largely retained on returning to ambient conditions. Although there was surprisingly no detectable difference in the degree of hard/soft segment segregation in the longer time annealing experiments, changes in interdomain spacing were detected at the lowest annealing temperature (120 C) used in this study. In combination with the findings from the synchrotron X-ray experiments, this demonstrates that domain reorganization is clearly both time and temperature dependent. The results from X-ray scattering and AFM experiments are also supported by those from FTIR spectroscopy and thermal analysis.

Original languageEnglish (US)
Pages (from-to)6520-6527
Number of pages8
JournalMacromolecules
Volume46
Issue number16
DOIs
StatePublished - Aug 27 2013

Fingerprint

Microstructure
Oxides
Annealing
Temperature
X ray scattering
Synchrotrons
Experiments
Coarsening
Hot Temperature
polyurea
polytetramethylene glycol
Heating rate
Thermoanalysis
Atomic force microscopy
Polymers
Spectroscopy
Cooling
Heating
X rays

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Castagna, Alicia M. ; Pangon, Autchara ; Dillon, Gregory P. ; Runt, James. / Effect of thermal history on the microstructure of a poly(tetramethylene oxide)-based polyurea. In: Macromolecules. 2013 ; Vol. 46, No. 16. pp. 6520-6527.
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Effect of thermal history on the microstructure of a poly(tetramethylene oxide)-based polyurea. / Castagna, Alicia M.; Pangon, Autchara; Dillon, Gregory P.; Runt, James.

In: Macromolecules, Vol. 46, No. 16, 27.08.2013, p. 6520-6527.

Research output: Contribution to journalArticle

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