Structure of sodium carboxymethyl cellulose aqueous solutions: A SANS and rheology study

Carlos G. Lopez, Sarah E. Rogers, Ralph H. Colby, Peter Graham, João T. Cabral

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

We report a small angle neutron scattering (SANS) and rheology study of cellulose derivative polyelectrolyte sodium carboxymethyl cellulose with a degree of substitution of 1.2. Using SANS, we establish that this polymer is molecularly dissolved in water with a locally stiff conformation with a stretching parameter B1:06. We determine the cross sectional radius of the chain (rp3.4 A° ) and the scaling of the correlation length with concentration (σ=296 c-1/2A° for c in g/L) is found to remain unchanged from the semidilute to concentrated crossover as identified by rheology. Viscosity measurements are found to be in qualitative agreement with scaling theory predictions for flexible polyelectrolytes exhibiting semidilute unentangled and entangled regimes, followed by what appears to be a crossover to neutral polymer concentration dependence of viscosity at high concentrations. Yet those higher concentrations, in the concentrated regime defined by rheology, still exhibit a peak in the scattering function that indicates a correlation length that continues to scale as c-1/2.

Original languageEnglish (US)
Pages (from-to)492-501
Number of pages10
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume53
Issue number7
DOIs
StatePublished - Apr 1 2015

Fingerprint

Carboxymethylcellulose Sodium
Neutron scattering
Rheology
cellulose
rheology
Cellulose
neutron scattering
Sodium
sodium
aqueous solutions
Polyelectrolytes
Polymers
Signal filtering and prediction
Cellulose derivatives
crossovers
Viscosity measurement
viscosity
scaling
Stretching
Conformations

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Lopez, Carlos G. ; Rogers, Sarah E. ; Colby, Ralph H. ; Graham, Peter ; Cabral, João T. / Structure of sodium carboxymethyl cellulose aqueous solutions : A SANS and rheology study. In: Journal of Polymer Science, Part B: Polymer Physics. 2015 ; Vol. 53, No. 7. pp. 492-501.
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Structure of sodium carboxymethyl cellulose aqueous solutions : A SANS and rheology study. / Lopez, Carlos G.; Rogers, Sarah E.; Colby, Ralph H.; Graham, Peter; Cabral, João T.

In: Journal of Polymer Science, Part B: Polymer Physics, Vol. 53, No. 7, 01.04.2015, p. 492-501.

Research output: Contribution to journalArticle

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