Viscoelastic and gas transport properties of a series of multiblock copolymer ionomers

Yanfang Fan; Mingqiang Zhang; Robert B. Moore; Hae Seung Lee; James E. McGrath; Chris J. Cornelius

doi:10.1016/j.polymer.2011.06.050

Viscoelastic and gas transport properties of a series of multiblock copolymer ionomers

Yanfang Fan, Mingqiang Zhang, Robert B. Moore, Hae Seung Lee, James E. McGrath, Chris J. Cornelius

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

A series of sulfonated poly(arylene ether sulfone) (BPSH-BPS) multiblock copolymer (MBC) ionomers were studied with respect to structure and physical properties. Ion exchange capacity (IEC_w) on a weight basis was constant for all MBC ionomers with controlled ionic and nonionic block lengths of 5k:5k, 10k:10k and 15k:15k. Viscoelastic properties were investigated as a function of block length, relaxation time, and temperature ranging from 200 °C to 250 °C. Relaxation time and glassy state modulus decreased with increasing ionic block length. Williams-Landel-Ferry (WLF) theory adequately modeled the viscoelastic changes in the BPSH-BPS MBC ionomers due to changes in time and temperature using a shift factor a_T. Small Angle X-ray Scatter (SAXS) revealed an average inter-chain d-spacing that increased with increasing ionic block length (21.1, 31.4 and 36.4 nm). The larger ionic domain size is attributed to an increase in bulk ionic density within an ionic domain. Bondi's group contribution method predicts a lower fractional free volume (FFV) with increasing ionic block length. The 15k BPSH-BPS MBC ionomer had the lowest FFV of the series, which corresponds to the lowest hydrogen permeability of 2.46 Barrers at 30 °C and 4 atm.

Original language	English (US)
Pages (from-to)	3963-3969
Number of pages	7
Journal	Polymer
Volume	52
Issue number	18
DOIs	https://doi.org/10.1016/j.polymer.2011.06.050
State	Published - Aug 18 2011
Externally published	Yes

Keywords

Ionomer
Transport
Viscoelasticity

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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10.1016/j.polymer.2011.06.050

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@article{4a69ca636f274a2590c455cdb5579f96,

title = "Viscoelastic and gas transport properties of a series of multiblock copolymer ionomers",

abstract = "A series of sulfonated poly(arylene ether sulfone) (BPSH-BPS) multiblock copolymer (MBC) ionomers were studied with respect to structure and physical properties. Ion exchange capacity (IECw) on a weight basis was constant for all MBC ionomers with controlled ionic and nonionic block lengths of 5k:5k, 10k:10k and 15k:15k. Viscoelastic properties were investigated as a function of block length, relaxation time, and temperature ranging from 200 °C to 250 °C. Relaxation time and glassy state modulus decreased with increasing ionic block length. Williams-Landel-Ferry (WLF) theory adequately modeled the viscoelastic changes in the BPSH-BPS MBC ionomers due to changes in time and temperature using a shift factor aT. Small Angle X-ray Scatter (SAXS) revealed an average inter-chain d-spacing that increased with increasing ionic block length (21.1, 31.4 and 36.4 nm). The larger ionic domain size is attributed to an increase in bulk ionic density within an ionic domain. Bondi's group contribution method predicts a lower fractional free volume (FFV) with increasing ionic block length. The 15k BPSH-BPS MBC ionomer had the lowest FFV of the series, which corresponds to the lowest hydrogen permeability of 2.46 Barrers at 30 °C and 4 atm.",

keywords = "Ionomer, Transport, Viscoelasticity",

author = "Yanfang Fan and Mingqiang Zhang and Moore, {Robert B.} and Lee, {Hae Seung} and McGrath, {James E.} and Cornelius, {Chris J.}",

note = "Funding Information: This work was partially supported by the DuPont Company. The authors of this paper would like to thank Professor Dillard at Virginia Tech, and Professor Shaw and the IMS at UCONN for providing access to their DMA instruments. Finally, we acknowledge partial support by the National Science Foundation MRI program DMR-0923107 that allowed us to do SAXS measurements in this study.",

year = "2011",

month = aug,

day = "18",

doi = "10.1016/j.polymer.2011.06.050",

language = "English (US)",

volume = "52",

pages = "3963--3969",

journal = "Polymer",

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publisher = "Elsevier B.V.",

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T1 - Viscoelastic and gas transport properties of a series of multiblock copolymer ionomers

AU - Fan, Yanfang

AU - Zhang, Mingqiang

AU - Moore, Robert B.

AU - Lee, Hae Seung

AU - McGrath, James E.

AU - Cornelius, Chris J.

N1 - Funding Information: This work was partially supported by the DuPont Company. The authors of this paper would like to thank Professor Dillard at Virginia Tech, and Professor Shaw and the IMS at UCONN for providing access to their DMA instruments. Finally, we acknowledge partial support by the National Science Foundation MRI program DMR-0923107 that allowed us to do SAXS measurements in this study.

PY - 2011/8/18

Y1 - 2011/8/18

N2 - A series of sulfonated poly(arylene ether sulfone) (BPSH-BPS) multiblock copolymer (MBC) ionomers were studied with respect to structure and physical properties. Ion exchange capacity (IECw) on a weight basis was constant for all MBC ionomers with controlled ionic and nonionic block lengths of 5k:5k, 10k:10k and 15k:15k. Viscoelastic properties were investigated as a function of block length, relaxation time, and temperature ranging from 200 °C to 250 °C. Relaxation time and glassy state modulus decreased with increasing ionic block length. Williams-Landel-Ferry (WLF) theory adequately modeled the viscoelastic changes in the BPSH-BPS MBC ionomers due to changes in time and temperature using a shift factor aT. Small Angle X-ray Scatter (SAXS) revealed an average inter-chain d-spacing that increased with increasing ionic block length (21.1, 31.4 and 36.4 nm). The larger ionic domain size is attributed to an increase in bulk ionic density within an ionic domain. Bondi's group contribution method predicts a lower fractional free volume (FFV) with increasing ionic block length. The 15k BPSH-BPS MBC ionomer had the lowest FFV of the series, which corresponds to the lowest hydrogen permeability of 2.46 Barrers at 30 °C and 4 atm.

AB - A series of sulfonated poly(arylene ether sulfone) (BPSH-BPS) multiblock copolymer (MBC) ionomers were studied with respect to structure and physical properties. Ion exchange capacity (IECw) on a weight basis was constant for all MBC ionomers with controlled ionic and nonionic block lengths of 5k:5k, 10k:10k and 15k:15k. Viscoelastic properties were investigated as a function of block length, relaxation time, and temperature ranging from 200 °C to 250 °C. Relaxation time and glassy state modulus decreased with increasing ionic block length. Williams-Landel-Ferry (WLF) theory adequately modeled the viscoelastic changes in the BPSH-BPS MBC ionomers due to changes in time and temperature using a shift factor aT. Small Angle X-ray Scatter (SAXS) revealed an average inter-chain d-spacing that increased with increasing ionic block length (21.1, 31.4 and 36.4 nm). The larger ionic domain size is attributed to an increase in bulk ionic density within an ionic domain. Bondi's group contribution method predicts a lower fractional free volume (FFV) with increasing ionic block length. The 15k BPSH-BPS MBC ionomer had the lowest FFV of the series, which corresponds to the lowest hydrogen permeability of 2.46 Barrers at 30 °C and 4 atm.

KW - Ionomer

KW - Transport

KW - Viscoelasticity

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U2 - 10.1016/j.polymer.2011.06.050

DO - 10.1016/j.polymer.2011.06.050

M3 - Article

AN - SCOPUS:80051822918

SN - 0032-3861

VL - 52

SP - 3963

EP - 3969

JO - Polymer

JF - Polymer

IS - 18

ER -

Viscoelastic and gas transport properties of a series of multiblock copolymer ionomers

Abstract

Keywords

ASJC Scopus subject areas

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