Self-assembly of cationic rod-like poly(2,5-pyridine) by acidic bis(trifluoromethane)sulfonimide in the hydrated state

A highly-ordered self-assembled protonic conductor

Marja Vilkman (Corresponding Author), A. Lankinen, N. Volk, P. Kostamo, O. Ikkala

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Abstract

We show that acid–base complexation of rod-like poly(2,5-pyridine) (PPY) by bis(trifluoromethane)sulfonimide (TFSI) leads to highly-ordered lamellar self-assemblies in the hydrated films and shows relatively high room temperature conductivity of ca. 10−4 S/cm. Thin films with different nominal degrees of complexation were studied using X-ray diffraction, Fourier transform infrared spectroscopy, contact angle measurements, conductivity measurements, and polarised optical microscopy. We propose that the self-assembly is promoted by the amphiphilicity of TFSI and the interplay between the hydrophilic and hydrophobic sites within the complexes. The hydrophilic sites allow confinement of water molecules within the hydrated self-assemblies for low loading of TFSI to promote proton conductivity. For high loading of TFSI in the hydrated state, another coincident self-assembled structure is additionally observed, which we suggest to form due to phase separated water/TFSI domains, as resembling lamellar water/surfactant liquid crystalline phases. The new type of self-assembled acid–base material combining rod-like polymeric cations and ionic liquid anions suggests new routes for ionic and protonic transport and functional materials.
Original languageEnglish
Pages (from-to)4095-4102
Number of pages8
JournalPolymer
Volume51
Issue number18
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

Fingerprint

Pyridine
Self assembly
Complexation
Water
Functional materials
Proton conductivity
Angle measurement
Ionic liquids
Contact angle
Optical microscopy
Fourier transform infrared spectroscopy
Surface active agents
Negative ions
Ionic Liquids
Positive ions
Crystalline materials
X ray diffraction
Thin films
Molecules
Surface-Active Agents

Keywords

  • Poly(2,5-pyridine)
  • Self-assembly
  • Ionic liquid anion

Cite this

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title = "Self-assembly of cationic rod-like poly(2,5-pyridine) by acidic bis(trifluoromethane)sulfonimide in the hydrated state: A highly-ordered self-assembled protonic conductor",
abstract = "We show that acid–base complexation of rod-like poly(2,5-pyridine) (PPY) by bis(trifluoromethane)sulfonimide (TFSI) leads to highly-ordered lamellar self-assemblies in the hydrated films and shows relatively high room temperature conductivity of ca. 10−4 S/cm. Thin films with different nominal degrees of complexation were studied using X-ray diffraction, Fourier transform infrared spectroscopy, contact angle measurements, conductivity measurements, and polarised optical microscopy. We propose that the self-assembly is promoted by the amphiphilicity of TFSI and the interplay between the hydrophilic and hydrophobic sites within the complexes. The hydrophilic sites allow confinement of water molecules within the hydrated self-assemblies for low loading of TFSI to promote proton conductivity. For high loading of TFSI in the hydrated state, another coincident self-assembled structure is additionally observed, which we suggest to form due to phase separated water/TFSI domains, as resembling lamellar water/surfactant liquid crystalline phases. The new type of self-assembled acid–base material combining rod-like polymeric cations and ionic liquid anions suggests new routes for ionic and protonic transport and functional materials.",
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author = "Marja Vilkman and A. Lankinen and N. Volk and P. Kostamo and O. Ikkala",
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language = "English",
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Self-assembly of cationic rod-like poly(2,5-pyridine) by acidic bis(trifluoromethane)sulfonimide in the hydrated state : A highly-ordered self-assembled protonic conductor. / Vilkman, Marja (Corresponding Author); Lankinen, A.; Volk, N.; Kostamo, P.; Ikkala, O.

In: Polymer, Vol. 51, No. 18, 2010, p. 4095-4102.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Self-assembly of cationic rod-like poly(2,5-pyridine) by acidic bis(trifluoromethane)sulfonimide in the hydrated state

T2 - A highly-ordered self-assembled protonic conductor

AU - Vilkman, Marja

AU - Lankinen, A.

AU - Volk, N.

AU - Kostamo, P.

AU - Ikkala, O.

PY - 2010

Y1 - 2010

N2 - We show that acid–base complexation of rod-like poly(2,5-pyridine) (PPY) by bis(trifluoromethane)sulfonimide (TFSI) leads to highly-ordered lamellar self-assemblies in the hydrated films and shows relatively high room temperature conductivity of ca. 10−4 S/cm. Thin films with different nominal degrees of complexation were studied using X-ray diffraction, Fourier transform infrared spectroscopy, contact angle measurements, conductivity measurements, and polarised optical microscopy. We propose that the self-assembly is promoted by the amphiphilicity of TFSI and the interplay between the hydrophilic and hydrophobic sites within the complexes. The hydrophilic sites allow confinement of water molecules within the hydrated self-assemblies for low loading of TFSI to promote proton conductivity. For high loading of TFSI in the hydrated state, another coincident self-assembled structure is additionally observed, which we suggest to form due to phase separated water/TFSI domains, as resembling lamellar water/surfactant liquid crystalline phases. The new type of self-assembled acid–base material combining rod-like polymeric cations and ionic liquid anions suggests new routes for ionic and protonic transport and functional materials.

AB - We show that acid–base complexation of rod-like poly(2,5-pyridine) (PPY) by bis(trifluoromethane)sulfonimide (TFSI) leads to highly-ordered lamellar self-assemblies in the hydrated films and shows relatively high room temperature conductivity of ca. 10−4 S/cm. Thin films with different nominal degrees of complexation were studied using X-ray diffraction, Fourier transform infrared spectroscopy, contact angle measurements, conductivity measurements, and polarised optical microscopy. We propose that the self-assembly is promoted by the amphiphilicity of TFSI and the interplay between the hydrophilic and hydrophobic sites within the complexes. The hydrophilic sites allow confinement of water molecules within the hydrated self-assemblies for low loading of TFSI to promote proton conductivity. For high loading of TFSI in the hydrated state, another coincident self-assembled structure is additionally observed, which we suggest to form due to phase separated water/TFSI domains, as resembling lamellar water/surfactant liquid crystalline phases. The new type of self-assembled acid–base material combining rod-like polymeric cations and ionic liquid anions suggests new routes for ionic and protonic transport and functional materials.

KW - Poly(2,5-pyridine)

KW - Self-assembly

KW - Ionic liquid anion

U2 - 10.1016/j.polymer.2010.07.005

DO - 10.1016/j.polymer.2010.07.005

M3 - Article

VL - 51

SP - 4095

EP - 4102

JO - Polymer

JF - Polymer

SN - 0032-3861

IS - 18

ER -