Sulfonated polymers containing polyhedral oligomeric silsesquioxane (POSS) core for high performance proton exchange membranes

Jie Zhang; Fang Chen; Xiaoyan Ma; Xinghua Guan; Dongyang Chen; Michael A. Hickner

doi:10.1016/j.ijhydene.2015.02.090

Sulfonated polymers containing polyhedral oligomeric silsesquioxane (POSS) core for high performance proton exchange membranes

Jie Zhang, Fang Chen, Xiaoyan Ma, Xinghua Guan, Dongyang Chen, Michael A. Hickner

School of Chemistry and Chemical Engineering

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

18 Scopus citations

Abstract

A series of POSS containing star-shaped block copolymers were synthesized by atom transfer radical polymerization (ATRP), with POSS-(Cl)₈ as initiator, polymethyl methacrylate as the first building block, and polystyrene as the second building block. Sulfonation of the polystyrene block yielded star-shaped ionic polymers POSS-(PMMA-b-SPS)₈ that were evaluated as proton exchange membranes (PEMs) subsequently. Under low relative humidities (RHs), the PEM with longer SPS block exhibited higher proton conductivity than the PEM with shorter SPS block when compared at same hydration number (λ) conditions, which was attributed to the better connected hydrophilic domains of the former as evidenced by electron microscopes. However, this conductivity trend for the two PEMs was reversed at 100% RHs. Low field nuclear magnetic resonance analysis revealed that the PEM with shorter SPS block had more loosely bonded water than the PEM with longer SPS block at 100% RH, giving an explanation of why the conductivity trend was reversed. This study suggested that both ionic domain structure and water-polymer interaction are important parameters for achieving high proton conductivities.

Original language	English
Pages (from-to)	7135-7143
Number of pages	9
Journal	International Journal of Hydrogen Energy
Volume	40
Issue number	22
DOIs	https://doi.org/10.1016/j.ijhydene.2015.02.090
State	Published - 15 Jun 2015

Keywords

Morphology
POSS containing block copolymer
Proton conductivity
Proton exchange membrane
Sulfonation

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.ijhydene.2015.02.090

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title = "Sulfonated polymers containing polyhedral oligomeric silsesquioxane (POSS) core for high performance proton exchange membranes",

abstract = "A series of POSS containing star-shaped block copolymers were synthesized by atom transfer radical polymerization (ATRP), with POSS-(Cl)8 as initiator, polymethyl methacrylate as the first building block, and polystyrene as the second building block. Sulfonation of the polystyrene block yielded star-shaped ionic polymers POSS-(PMMA-b-SPS)8 that were evaluated as proton exchange membranes (PEMs) subsequently. Under low relative humidities (RHs), the PEM with longer SPS block exhibited higher proton conductivity than the PEM with shorter SPS block when compared at same hydration number (λ) conditions, which was attributed to the better connected hydrophilic domains of the former as evidenced by electron microscopes. However, this conductivity trend for the two PEMs was reversed at 100% RHs. Low field nuclear magnetic resonance analysis revealed that the PEM with shorter SPS block had more loosely bonded water than the PEM with longer SPS block at 100% RH, giving an explanation of why the conductivity trend was reversed. This study suggested that both ionic domain structure and water-polymer interaction are important parameters for achieving high proton conductivities.",

keywords = "Morphology, POSS containing block copolymer, Proton conductivity, Proton exchange membrane, Sulfonation",

author = "Jie Zhang and Fang Chen and Xiaoyan Ma and Xinghua Guan and Dongyang Chen and Hickner, {Michael A.}",

year = "2015",

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doi = "10.1016/j.ijhydene.2015.02.090",

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T1 - Sulfonated polymers containing polyhedral oligomeric silsesquioxane (POSS) core for high performance proton exchange membranes

AU - Zhang, Jie

AU - Chen, Fang

AU - Ma, Xiaoyan

AU - Guan, Xinghua

AU - Chen, Dongyang

AU - Hickner, Michael A.

PY - 2015/6/15

Y1 - 2015/6/15

N2 - A series of POSS containing star-shaped block copolymers were synthesized by atom transfer radical polymerization (ATRP), with POSS-(Cl)8 as initiator, polymethyl methacrylate as the first building block, and polystyrene as the second building block. Sulfonation of the polystyrene block yielded star-shaped ionic polymers POSS-(PMMA-b-SPS)8 that were evaluated as proton exchange membranes (PEMs) subsequently. Under low relative humidities (RHs), the PEM with longer SPS block exhibited higher proton conductivity than the PEM with shorter SPS block when compared at same hydration number (λ) conditions, which was attributed to the better connected hydrophilic domains of the former as evidenced by electron microscopes. However, this conductivity trend for the two PEMs was reversed at 100% RHs. Low field nuclear magnetic resonance analysis revealed that the PEM with shorter SPS block had more loosely bonded water than the PEM with longer SPS block at 100% RH, giving an explanation of why the conductivity trend was reversed. This study suggested that both ionic domain structure and water-polymer interaction are important parameters for achieving high proton conductivities.

AB - A series of POSS containing star-shaped block copolymers were synthesized by atom transfer radical polymerization (ATRP), with POSS-(Cl)8 as initiator, polymethyl methacrylate as the first building block, and polystyrene as the second building block. Sulfonation of the polystyrene block yielded star-shaped ionic polymers POSS-(PMMA-b-SPS)8 that were evaluated as proton exchange membranes (PEMs) subsequently. Under low relative humidities (RHs), the PEM with longer SPS block exhibited higher proton conductivity than the PEM with shorter SPS block when compared at same hydration number (λ) conditions, which was attributed to the better connected hydrophilic domains of the former as evidenced by electron microscopes. However, this conductivity trend for the two PEMs was reversed at 100% RHs. Low field nuclear magnetic resonance analysis revealed that the PEM with shorter SPS block had more loosely bonded water than the PEM with longer SPS block at 100% RH, giving an explanation of why the conductivity trend was reversed. This study suggested that both ionic domain structure and water-polymer interaction are important parameters for achieving high proton conductivities.

KW - Morphology

KW - POSS containing block copolymer

KW - Proton conductivity

KW - Proton exchange membrane

KW - Sulfonation

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DO - 10.1016/j.ijhydene.2015.02.090

M3 - 文章

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SN - 0360-3199

VL - 40

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EP - 7143

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

IS - 22

ER -

Sulfonated polymers containing polyhedral oligomeric silsesquioxane (POSS) core for high performance proton exchange membranes

Abstract

Keywords

UN SDGs

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