Influence of ionic charge placement on performance of poly(ethylene glycol)-based sulfonated polyurethanes

Renlong Gao, Mingqiang Zhang, Ninad Dixit, Robert B. Moore, Timothy Edward Long

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Poly(ethylene glycol) (PEG)-based sulfonated polyurethanes bearing either sulfonated soft segments (SSSPU) or sulfonated hard segments (SHSPU) were synthesized using sulfonated monomers. Differential scanning calorimetry (DSC) revealed that sulfonate anions either in the soft segments or hard segments both increased the glass transition temperatures (T g's) of the soft segments and suppressed their crystallization. Moreover, dynamic mechanical analysis (DMA) and tensile analysis demonstrated that SSSPU possessed a higher modulus and tensile strength relative to SHSPU. Fourier transform infrared (FTIR) spectroscopy revealed that hydrogen bonding interactions in SHSPU were suppressed compared to SSSPU and noncharged PU. This observation suggested a high level of phase-mixing for SHSPU. In addition, atomic force microscopy (AFM) phase images revealed that both SSSPU and noncharged PU formed well-defined microphase-separated morphologies, where the hard segments phase-separated into needle-like hard domains at the nanoscale. However, SHSPU showed a phase-mixed morphology, which was attributed to increased compatibility of polar PEG soft segments with sulfonated ionic hard segments and disruption of hydrogen bonds in the hard segment. The phase-mixed morphology of SHSPU was further demonstrated using small angle X-ray scattering (SAXS), which showed a featureless X-ray scattering profile. In contrast, SAXS profiles of SSSPU and noncharged PU demonstrated microphase-separated morphologies. Moreover, SSSPU also displayed a broad ionomer peak ranging in q = 1-2 nm -1, which resulted from the sodium sulfonate ion pair association in the polar PEG soft phase. Morphologies of sulfonated polyurethanes correlated well with thermal and mechanical properties.

Original languageEnglish
Pages (from-to)1203-1211
Number of pages9
JournalPolymer
Volume53
Issue number6
DOIs
Publication statusPublished - 2012 Mar 9
Externally publishedYes

Fingerprint

Polyurethanes
Polyethylene glycols
X ray scattering
Hydrogen bonds
Bearings (structural)
Ionomers
Dynamic mechanical analysis
Crystallization
Needles
Fourier transform infrared spectroscopy
Anions
Differential scanning calorimetry
Atomic force microscopy
Tensile strength
Negative ions
Thermodynamic properties
Monomers
Sodium
Association reactions
Ions

Keywords

  • Mechanical properties
  • Morphology
  • Sulfonated polyurethane

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry

Cite this

Influence of ionic charge placement on performance of poly(ethylene glycol)-based sulfonated polyurethanes. / Gao, Renlong; Zhang, Mingqiang; Dixit, Ninad; Moore, Robert B.; Long, Timothy Edward.

In: Polymer, Vol. 53, No. 6, 09.03.2012, p. 1203-1211.

Research output: Contribution to journalArticle

Gao, Renlong ; Zhang, Mingqiang ; Dixit, Ninad ; Moore, Robert B. ; Long, Timothy Edward. / Influence of ionic charge placement on performance of poly(ethylene glycol)-based sulfonated polyurethanes. In: Polymer. 2012 ; Vol. 53, No. 6. pp. 1203-1211.
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