Viscoelastic behavior of lightly sulfonated polystyrene ionomers

Weiß, Robert; Fitzgerald, John J.; Kim, D.

doi:10.1021/ma00005a015

Cited by 159 publications

(194 citation statements)

References 16 publications

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“…Ionic aggregation in ionomers has been confirmed by small-angle X rays and inferred from mechanical measurements with dynamic mechanical analyzers. [37][38][39][40][41] Both the elastic modulus and the glass-transition temperature of ionomers were shown to increase with an increase in the ionic content of a sample in agreement with the expectation of an increase in ion clusters.…”

Section: Effect Of the Microphase-separated Structure On The Mechanicsupporting

confidence: 66%

Microphase-separated structure of telechelic urethane acrylate anionomers and their network in various solvents

Kim¹,

Chon

Yoo

et al. 2000

J. Polym. Sci. B Polym. Phys.

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Section: Effect Of the Microphase-separated Structure On The Mechanicsupporting

confidence: 66%

Microphase-separated structure of telechelic urethane acrylate anionomers and their network in various solvents

Kim¹,

Chon

Yoo

et al. 2000

J. Polym. Sci. B Polym. Phys.

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“…Ionic materials are known to present two types of transitions 8 -one at low temperature, associated with the glass transition of the polymer, and a second one at high temperature associated with the formation of ionic structures, preferably clusters.…”

Section: Dynamical Mechanical Propertiesmentioning

confidence: 99%

Ionic elastomers based on carboxylated nitrile rubber and magnesium oxide

Ibarra¹,

Alzorriz²

2006

J of Applied Polymer Sci

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The crosslinking of carboxylated nitrile rubber (XNBR) with magnesium oxide (MgO) leads to an ionic elastomer with thermoplastic nature and better physical properties than the ones obtained with other metallic oxides. The crosslinking reaction leads to the formation of a metallic salt as unique product, as it could be seen on the ATR analysis of the samples, prepared at different reaction times. The mechanical properties of the material increase with the amount of crosslinking agent and segregation of an ionic microphase takes place. The presence of this microphase is demonstrated by a relaxation at high temperatures. The apparent activation energy of this relaxation is smaller than the activation energy of the glass transition of the elastomer, the former being more dependent on the amount of metallic oxide than is the latter.

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“…16,17) The ion aggregates in ionomers act as physical cross-linkers and so contribute to their elastic behavior; these aggregates enhance the magnitude of the plateau modulus and increase the terminal relaxation time. 18) In this sense, the enhanced rubbery modulus for P(VI/C 2 TFSI) with x q = 0.05 may be due to the presence of ionic aggregates. It is important to note that ionomers with large counter ions form few or no ion aggregates and show plasticizing effect to decrease the terminal relaxation time.…”

Section: Viscoelastic Master Curvesmentioning

confidence: 99%