Influence of cation type on structure and dynamics in sulfonated polystyrene ionomers

Alicia M. Castagna; Wenqin Wang; Karen I. Winey; James Runt

doi:10.1021/ma2009657

Influence of cation type on structure and dynamics in sulfonated polystyrene ionomers

Alicia M. Castagna, Wenqin Wang, Karen I. Winey, James Runt

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Abstract

The structure and dynamics of Na-, Cs-, and Zn-neutralized sulfonated polystyrene (SPS) ionomers were investigated using scanning transmission electron microscopy (STEM), X-ray scattering, and dielectric relaxation spectroscopy. Aggregates ∼2 nm in diameter were revealed by STEM and X-ray scattering. Additional information on aggregate diameter, radius of closest approach, and number density were determined by fitting the scattering data with a modified hard sphere model. A single broad segmental relaxation was identified in dielectric loss spectra for the ionomers neutralized with monovalent ions Cs and Na. The relaxation time of the segmental process was found to slow down systematically with increasing degree of sulfonation but is not significantly affected by monovalent ion type. For Cs-neutralized SPS, two high temperature relaxations associated with Maxwell-Wagner-Sillars and ion association/disassociation dynamics were identified.

Original language	English (US)
Pages (from-to)	5420-5426
Number of pages	7
Journal	Macromolecules
Volume	44
Issue number	13
DOIs	https://doi.org/10.1021/ma2009657
State	Published - Jul 12 2011

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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title = "Influence of cation type on structure and dynamics in sulfonated polystyrene ionomers",

abstract = "The structure and dynamics of Na-, Cs-, and Zn-neutralized sulfonated polystyrene (SPS) ionomers were investigated using scanning transmission electron microscopy (STEM), X-ray scattering, and dielectric relaxation spectroscopy. Aggregates ∼2 nm in diameter were revealed by STEM and X-ray scattering. Additional information on aggregate diameter, radius of closest approach, and number density were determined by fitting the scattering data with a modified hard sphere model. A single broad segmental relaxation was identified in dielectric loss spectra for the ionomers neutralized with monovalent ions Cs and Na. The relaxation time of the segmental process was found to slow down systematically with increasing degree of sulfonation but is not significantly affected by monovalent ion type. For Cs-neutralized SPS, two high temperature relaxations associated with Maxwell-Wagner-Sillars and ion association/disassociation dynamics were identified.",

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T1 - Influence of cation type on structure and dynamics in sulfonated polystyrene ionomers

AU - Castagna, Alicia M.

AU - Wang, Wenqin

AU - Winey, Karen I.

AU - Runt, James

PY - 2011/7/12

Y1 - 2011/7/12

N2 - The structure and dynamics of Na-, Cs-, and Zn-neutralized sulfonated polystyrene (SPS) ionomers were investigated using scanning transmission electron microscopy (STEM), X-ray scattering, and dielectric relaxation spectroscopy. Aggregates ∼2 nm in diameter were revealed by STEM and X-ray scattering. Additional information on aggregate diameter, radius of closest approach, and number density were determined by fitting the scattering data with a modified hard sphere model. A single broad segmental relaxation was identified in dielectric loss spectra for the ionomers neutralized with monovalent ions Cs and Na. The relaxation time of the segmental process was found to slow down systematically with increasing degree of sulfonation but is not significantly affected by monovalent ion type. For Cs-neutralized SPS, two high temperature relaxations associated with Maxwell-Wagner-Sillars and ion association/disassociation dynamics were identified.

AB - The structure and dynamics of Na-, Cs-, and Zn-neutralized sulfonated polystyrene (SPS) ionomers were investigated using scanning transmission electron microscopy (STEM), X-ray scattering, and dielectric relaxation spectroscopy. Aggregates ∼2 nm in diameter were revealed by STEM and X-ray scattering. Additional information on aggregate diameter, radius of closest approach, and number density were determined by fitting the scattering data with a modified hard sphere model. A single broad segmental relaxation was identified in dielectric loss spectra for the ionomers neutralized with monovalent ions Cs and Na. The relaxation time of the segmental process was found to slow down systematically with increasing degree of sulfonation but is not significantly affected by monovalent ion type. For Cs-neutralized SPS, two high temperature relaxations associated with Maxwell-Wagner-Sillars and ion association/disassociation dynamics were identified.

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Influence of cation type on structure and dynamics in sulfonated polystyrene ionomers

Abstract

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