Nonlinear shear and uniaxial extensional rheology of polyether-ester-sulfonate copolymer ionomer melts

Aamir Shabbir, Qian Huang, Guilhem P. Baeza, Dimitris Vlassopoulos, Quan Chen, Ralph H. Colby, Nicolas J. Alvarez, Ole Hassager

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We present unique nonlinear shear and extensional rheology data of unentangled amorphous polyester ionomers based on polyethers and sulphonated phthalates with sodium/lithium counterions. Previous linear viscoelastic measurements showed significant elasticity in these ionomers due to the formation of strong ionic aggregates. These ionomer melts exhibit viscoelastic properties similar to well-entangled melts with an extended rubbery plateau. To evaluate the effects of nonlinear deformation, the rheology of these ionomers was investigated using uniaxial extension and shear. The measurements were performed on a filament stretching rheometer and on a strain controlled rotational rheometer equipped with a cone-partitioned-plate setup. In extension, ionomer samples exhibited a decreasing strain hardening trend with increasing extension rates. At the same Weissenberg number, the same strain hardening was observed for different counterions. The presence of high solvating poly(ethylene oxide), PEO, along the backbone in the coionomer with poly(tetramethylene glycol), PTMO, increases the maximum Hencky strain at fracture, thus adding ductility to the brittle PTMO-Na ionomer. As a result, the coionomer deforms much more compared to PTMO-Na, but eventually, both fracture. On the other hand, whereas PTMO-Na cannot be sheared due to wall slip, the coionomer deforms in shear and eventually suffers from edge fracture instabilities. From the above, a picture emerges suggesting that PEO coionomers enhance ductility, make fracture smoother and offer a compromise of mechanical performance and ion conduction.

Original languageEnglish (US)
Pages (from-to)1279-1289
Number of pages11
JournalJournal of Rheology
Volume61
Issue number6
DOIs
StatePublished - Nov 1 2017

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Ionomers
Polyethers
sulfonates
Rheology
rheology
esters
copolymers
Esters
Copolymers
shear
rheometers
strain hardening
Polyethylene oxides
ductility
Rheometers
Strain hardening
phthalates
Ductility
polyesters
ethylene oxide

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Shabbir, A., Huang, Q., Baeza, G. P., Vlassopoulos, D., Chen, Q., Colby, R. H., ... Hassager, O. (2017). Nonlinear shear and uniaxial extensional rheology of polyether-ester-sulfonate copolymer ionomer melts. Journal of Rheology, 61(6), 1279-1289. https://doi.org/10.1122/1.4998158
Shabbir, Aamir ; Huang, Qian ; Baeza, Guilhem P. ; Vlassopoulos, Dimitris ; Chen, Quan ; Colby, Ralph H. ; Alvarez, Nicolas J. ; Hassager, Ole. / Nonlinear shear and uniaxial extensional rheology of polyether-ester-sulfonate copolymer ionomer melts. In: Journal of Rheology. 2017 ; Vol. 61, No. 6. pp. 1279-1289.
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Shabbir, A, Huang, Q, Baeza, GP, Vlassopoulos, D, Chen, Q, Colby, RH, Alvarez, NJ & Hassager, O 2017, 'Nonlinear shear and uniaxial extensional rheology of polyether-ester-sulfonate copolymer ionomer melts', Journal of Rheology, vol. 61, no. 6, pp. 1279-1289. https://doi.org/10.1122/1.4998158

Nonlinear shear and uniaxial extensional rheology of polyether-ester-sulfonate copolymer ionomer melts. / Shabbir, Aamir; Huang, Qian; Baeza, Guilhem P.; Vlassopoulos, Dimitris; Chen, Quan; Colby, Ralph H.; Alvarez, Nicolas J.; Hassager, Ole.

In: Journal of Rheology, Vol. 61, No. 6, 01.11.2017, p. 1279-1289.

Research output: Contribution to journalArticle

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T1 - Nonlinear shear and uniaxial extensional rheology of polyether-ester-sulfonate copolymer ionomer melts

AU - Shabbir, Aamir

AU - Huang, Qian

AU - Baeza, Guilhem P.

AU - Vlassopoulos, Dimitris

AU - Chen, Quan

AU - Colby, Ralph H.

AU - Alvarez, Nicolas J.

AU - Hassager, Ole

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N2 - We present unique nonlinear shear and extensional rheology data of unentangled amorphous polyester ionomers based on polyethers and sulphonated phthalates with sodium/lithium counterions. Previous linear viscoelastic measurements showed significant elasticity in these ionomers due to the formation of strong ionic aggregates. These ionomer melts exhibit viscoelastic properties similar to well-entangled melts with an extended rubbery plateau. To evaluate the effects of nonlinear deformation, the rheology of these ionomers was investigated using uniaxial extension and shear. The measurements were performed on a filament stretching rheometer and on a strain controlled rotational rheometer equipped with a cone-partitioned-plate setup. In extension, ionomer samples exhibited a decreasing strain hardening trend with increasing extension rates. At the same Weissenberg number, the same strain hardening was observed for different counterions. The presence of high solvating poly(ethylene oxide), PEO, along the backbone in the coionomer with poly(tetramethylene glycol), PTMO, increases the maximum Hencky strain at fracture, thus adding ductility to the brittle PTMO-Na ionomer. As a result, the coionomer deforms much more compared to PTMO-Na, but eventually, both fracture. On the other hand, whereas PTMO-Na cannot be sheared due to wall slip, the coionomer deforms in shear and eventually suffers from edge fracture instabilities. From the above, a picture emerges suggesting that PEO coionomers enhance ductility, make fracture smoother and offer a compromise of mechanical performance and ion conduction.

AB - We present unique nonlinear shear and extensional rheology data of unentangled amorphous polyester ionomers based on polyethers and sulphonated phthalates with sodium/lithium counterions. Previous linear viscoelastic measurements showed significant elasticity in these ionomers due to the formation of strong ionic aggregates. These ionomer melts exhibit viscoelastic properties similar to well-entangled melts with an extended rubbery plateau. To evaluate the effects of nonlinear deformation, the rheology of these ionomers was investigated using uniaxial extension and shear. The measurements were performed on a filament stretching rheometer and on a strain controlled rotational rheometer equipped with a cone-partitioned-plate setup. In extension, ionomer samples exhibited a decreasing strain hardening trend with increasing extension rates. At the same Weissenberg number, the same strain hardening was observed for different counterions. The presence of high solvating poly(ethylene oxide), PEO, along the backbone in the coionomer with poly(tetramethylene glycol), PTMO, increases the maximum Hencky strain at fracture, thus adding ductility to the brittle PTMO-Na ionomer. As a result, the coionomer deforms much more compared to PTMO-Na, but eventually, both fracture. On the other hand, whereas PTMO-Na cannot be sheared due to wall slip, the coionomer deforms in shear and eventually suffers from edge fracture instabilities. From the above, a picture emerges suggesting that PEO coionomers enhance ductility, make fracture smoother and offer a compromise of mechanical performance and ion conduction.

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