The role of soft segment molecular weight on microphase separation and dynamics of bulk polymerized polyureas

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

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

The influence of poly(tetramethylene oxide) (PTMO) soft segment length on the phase-separated microstructure, state of hydrogen-bonded associations, and molecular dynamics was investigated in polyureas polymerized from the bulk. For higher PTMO molecular weights (1000 and 650 g/mol) hard segments self-assemble into ribbon-like domains, while incorporation of a 250 g/mol soft segment leads to a predominately mixed segment material. The degree of microphase separation of the hard and soft segments, however, is rather incomplete for polymers synthesized from 1000 and 650 g/mol PTMO and decreases with decreasing soft segment molecular weight. Broadband dielectric relaxation spectroscopy reveals two segmental relaxations: a soft segment rich (α) and slow segmental (α 2) process. When the molecular weight is reduced from 1000 to 650 g/mol the mobility of these processes is reduced, consistent with findings from differential scanning calorimetry and dynamic mechanical analysis.

Original languageEnglish (US)
Pages (from-to)8438-8444
Number of pages7
JournalMacromolecules
Volume45
Issue number20
DOIs
StatePublished - Oct 23 2012

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Microphase separation
Molecular weight
Oxides
Dielectric relaxation
Dynamic mechanical analysis
Molecular dynamics
Hydrogen
Differential scanning calorimetry
Polymers
Spectroscopy
Microstructure
polytetramethylene glycol
polyurea

All Science Journal Classification (ASJC) codes

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

Cite this

Castagna, Alicia M. ; Pangon, Autchara ; Choi, Taeyi ; Dillon, Gregory P. ; Runt, James Patrick. / The role of soft segment molecular weight on microphase separation and dynamics of bulk polymerized polyureas. In: Macromolecules. 2012 ; Vol. 45, No. 20. pp. 8438-8444.
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The role of soft segment molecular weight on microphase separation and dynamics of bulk polymerized polyureas. / Castagna, Alicia M.; Pangon, Autchara; Choi, Taeyi; Dillon, Gregory P.; Runt, James Patrick.

In: Macromolecules, Vol. 45, No. 20, 23.10.2012, p. 8438-8444.

Research output: Contribution to journalArticle

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AB - The influence of poly(tetramethylene oxide) (PTMO) soft segment length on the phase-separated microstructure, state of hydrogen-bonded associations, and molecular dynamics was investigated in polyureas polymerized from the bulk. For higher PTMO molecular weights (1000 and 650 g/mol) hard segments self-assemble into ribbon-like domains, while incorporation of a 250 g/mol soft segment leads to a predominately mixed segment material. The degree of microphase separation of the hard and soft segments, however, is rather incomplete for polymers synthesized from 1000 and 650 g/mol PTMO and decreases with decreasing soft segment molecular weight. Broadband dielectric relaxation spectroscopy reveals two segmental relaxations: a soft segment rich (α) and slow segmental (α 2) process. When the molecular weight is reduced from 1000 to 650 g/mol the mobility of these processes is reduced, consistent with findings from differential scanning calorimetry and dynamic mechanical analysis.

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