Functional Liquid-Crystalline Polymers for Ionic and Electronic Conduction - Liquid Crystalline Functional Assemblies and Their Supramolecular Structures - page 149

Functional Liquid-Crystalline Polymers
for Ionic and Electronic Conduction

Masahiro Funahashi · Harutoki Shimura · Masafumi Yoshio ·
Ta ka sh i Kat o ( )

Department of Chemistry and Biotechnology, School of Engineering,
The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-8656 Tokyo, Japan
[e-mail]

1 I tr cti n ................................... 151

2 Ion-Conductive Liquid-Crystalline Polymers ................. 153

2.1 OrganicIon-ConductivePolymers....................... 153

2.2 Low Molecular Weight Nanostructured Liquid-Crystalline Compounds . . 154

2.3 NanostructuredLiquid-CrystallinePolymers ................. 156

3 Electron-Conductive Side-Chain Liquid-Crystalline Polymers ....... 163

3.1 Side-Chain Polymers and Low Molecular Weight Liquid Crystals . . . . . . 163

3.2 PioneeringWorksforLiquid-CrystallinePolymers.............. 166

3.3 SemiconductivePolymerswithNematicPhases................ 169

3.4 PhotopolymerizationinSmecticPhases.................... 172

3.5 MiscellaneousSystemsandRelatedCompounds ............... 174

4 cl si n .................................... 175

References ....................................... 176

Abstract Liquid-crystalline (LC) polymers that exhibit ionic or electronic conduction are
described. Anisotropic and efficient transportation of electrons and ions is expected for
thesematerials.TheorderedLCnanostructuresofLCpolymershavingion-orelectron-
active moieties are important for efficient anisotropic transport. For electron-conductive
materials, we focus on side-chain LC polymers.

Keywords Liquid crystal · Liquid-crystalline polymer · Side-chain polymer ·

Ion-conductor · Semiconductor

1
Introduction

For organic materials, electronic and ionic conduction are important top-
ics [1]. Liquid-crystalline (LC) polymers are good candidates for materials
that transport ions and electrons because their ordered nanostructures are
expected to induce anisotropic and efficient conduction [2-10]. However,
limited numbers of examples have been reported for electron- and ion-active
LC polymers, compared to crystalline and amorphous polymers [3-10].