Solution rheological behavior and electrospinning of cationic polyelectrolytes

Matthew G. McKee, Matthew T. Hunley, John M. Layman, Timothy Edward Long

Research output: Contribution to journalArticle

143 Citations (Scopus)

Abstract

The influence of polyelectrolyte theological behavior on the electrospinning process was determined for a series of poly(2-(dimethylamino) ethyl methacrylate hydrochloride) (PDMAEMA·HCl) aqueous solutions in the presence of added NaCl. Solution Theological studies revealed that PDMAEMA·HCl in an 80/20 w/w water/methanol cosolvent displayed polyelectrolyte behavior based on the scaling relationship between specific viscosity (η sp) and concentration in the semidilute unentangled and semidilute entangled regimes. The entanglement concentration (C e) increased with NaCl concentration due to screening of the electrostatic repulsive forces along the PDMAEMA·HCl backbone, which enabled the PDMAEMA·HCl chains to adopt a flexible, coillike conformation. Moreover, the scaling behavior in the semidilute entangled regime shifted from polyelectrolyte (η sp ∼ C 1.5) to neutral polymer behavior (η sp ∼ C 1.5) in the high salt limit. The electrospinning performance of PDMAEMA·HCl solutions was also dependent on NaCl concentration, and NaCl-free PDMAEMA·HCl solutions did not form fibers at concentrations less than 8C e. The minimum concentration for fiber formation decreased as the level of NaCl was increased due to screening of the repulsive, electrostatic interactions between charged repeating units that served to stabilize the electrospinning jet. Moreover, because of the high electrical conductivity of the polyelectrolyte solutions, the electrospun polyelectrolyte fibers were 2-3 orders of magnitude smaller in diameter compared to fibers that were electrospun from solutions of neutral polymers of equal zero shear viscosity (η 0) and normalized concentration (C/C e).

Original languageEnglish
Pages (from-to)575-583
Number of pages9
JournalMacromolecules
Volume39
Issue number2
DOIs
Publication statusPublished - 2006 Jan 24
Externally publishedYes

Fingerprint

Electrospinning
Polyelectrolytes
Fibers
Screening
Polymers
Shear viscosity
Electrostatic force
Coulomb interactions
Methanol
Conformations
polycations
poly(2-(dimethylamino)ethyl methacrylate)
Salts
Viscosity
Water

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

McKee, M. G., Hunley, M. T., Layman, J. M., & Long, T. E. (2006). Solution rheological behavior and electrospinning of cationic polyelectrolytes. Macromolecules, 39(2), 575-583. https://doi.org/10.1021/ma051786u

Solution rheological behavior and electrospinning of cationic polyelectrolytes. / McKee, Matthew G.; Hunley, Matthew T.; Layman, John M.; Long, Timothy Edward.

In: Macromolecules, Vol. 39, No. 2, 24.01.2006, p. 575-583.

Research output: Contribution to journalArticle

McKee, MG, Hunley, MT, Layman, JM & Long, TE 2006, 'Solution rheological behavior and electrospinning of cationic polyelectrolytes', Macromolecules, vol. 39, no. 2, pp. 575-583. https://doi.org/10.1021/ma051786u
McKee, Matthew G. ; Hunley, Matthew T. ; Layman, John M. ; Long, Timothy Edward. / Solution rheological behavior and electrospinning of cationic polyelectrolytes. In: Macromolecules. 2006 ; Vol. 39, No. 2. pp. 575-583.
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