Solvent tunable multi-block ionomer morphology and its relationship to modulus, water swelling, directionally dependent ion transport, and actuator performance

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13 Citations (Scopus)

Abstract

Sulfonated penta-block ionomer (SBI) solvent cast film's ion domain spatial arrangement transitioned from random into well-connected lamellar/hexagonal structures. This micro-phase separated morphology was tunable and associated solution properties transitioning from nonpolar cyclohexane/heptane (CH) to polar tetrahydrofuran (THF). The observed morphology changes were characterized using transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). SAXS revealed that average sulfonated inter-domain spacing increased asymmetrically within the film. For example, solvent cast SBI-H+ film inter-domain spacing changed from 30.8 nm using CH to 43 nm with THF. This lamellar/hexagonal morphology led to a two-fold water uptake increase from 23 wt% to 46 wt%, and an order-of-magnitude proton conductivity improvement from 4.5 mS/cm to 47.8 mS/cm. Ionomeric polymer-metal composite (IPMC) actuation performance was morphology dependent. The film with a random morphology had small actuation displacement with slow bending speed. However, well-connected ion domains enabled rapid and large bending motions.

Original languageEnglish (US)
Pages (from-to)104-111
Number of pages8
JournalPolymer
Volume103
DOIs
StatePublished - Oct 26 2016

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Ionomers
Swelling
Actuators
Ions
Water
Heptanes
Heptane
Cyclohexane
X ray scattering
Lamellar structures
Proton conductivity
Polymers
Metals
Transmission electron microscopy
Composite materials

Keywords

  • Block ionomer morphology
  • Ionic/ionomeric polymer-metal composite
  • Water uptake and ion conductivity

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

Cite this

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title = "Solvent tunable multi-block ionomer morphology and its relationship to modulus, water swelling, directionally dependent ion transport, and actuator performance",
abstract = "Sulfonated penta-block ionomer (SBI) solvent cast film's ion domain spatial arrangement transitioned from random into well-connected lamellar/hexagonal structures. This micro-phase separated morphology was tunable and associated solution properties transitioning from nonpolar cyclohexane/heptane (CH) to polar tetrahydrofuran (THF). The observed morphology changes were characterized using transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). SAXS revealed that average sulfonated inter-domain spacing increased asymmetrically within the film. For example, solvent cast SBI-H+ film inter-domain spacing changed from 30.8 nm using CH to 43 nm with THF. This lamellar/hexagonal morphology led to a two-fold water uptake increase from 23 wt{\%} to 46 wt{\%}, and an order-of-magnitude proton conductivity improvement from 4.5 mS/cm to 47.8 mS/cm. Ionomeric polymer-metal composite (IPMC) actuation performance was morphology dependent. The film with a random morphology had small actuation displacement with slow bending speed. However, well-connected ion domains enabled rapid and large bending motions.",
keywords = "Block ionomer morphology, Ionic/ionomeric polymer-metal composite, Water uptake and ion conductivity",
author = "W. Zheng and Cornelius, {Christopher J}",
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T1 - Solvent tunable multi-block ionomer morphology and its relationship to modulus, water swelling, directionally dependent ion transport, and actuator performance

AU - Zheng, W.

AU - Cornelius, Christopher J

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N2 - Sulfonated penta-block ionomer (SBI) solvent cast film's ion domain spatial arrangement transitioned from random into well-connected lamellar/hexagonal structures. This micro-phase separated morphology was tunable and associated solution properties transitioning from nonpolar cyclohexane/heptane (CH) to polar tetrahydrofuran (THF). The observed morphology changes were characterized using transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). SAXS revealed that average sulfonated inter-domain spacing increased asymmetrically within the film. For example, solvent cast SBI-H+ film inter-domain spacing changed from 30.8 nm using CH to 43 nm with THF. This lamellar/hexagonal morphology led to a two-fold water uptake increase from 23 wt% to 46 wt%, and an order-of-magnitude proton conductivity improvement from 4.5 mS/cm to 47.8 mS/cm. Ionomeric polymer-metal composite (IPMC) actuation performance was morphology dependent. The film with a random morphology had small actuation displacement with slow bending speed. However, well-connected ion domains enabled rapid and large bending motions.

AB - Sulfonated penta-block ionomer (SBI) solvent cast film's ion domain spatial arrangement transitioned from random into well-connected lamellar/hexagonal structures. This micro-phase separated morphology was tunable and associated solution properties transitioning from nonpolar cyclohexane/heptane (CH) to polar tetrahydrofuran (THF). The observed morphology changes were characterized using transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). SAXS revealed that average sulfonated inter-domain spacing increased asymmetrically within the film. For example, solvent cast SBI-H+ film inter-domain spacing changed from 30.8 nm using CH to 43 nm with THF. This lamellar/hexagonal morphology led to a two-fold water uptake increase from 23 wt% to 46 wt%, and an order-of-magnitude proton conductivity improvement from 4.5 mS/cm to 47.8 mS/cm. Ionomeric polymer-metal composite (IPMC) actuation performance was morphology dependent. The film with a random morphology had small actuation displacement with slow bending speed. However, well-connected ion domains enabled rapid and large bending motions.

KW - Block ionomer morphology

KW - Ionic/ionomeric polymer-metal composite

KW - Water uptake and ion conductivity

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