Synthesis and characterisation of side chain liquid crystal copolymers containing sulfonic acid groups

A Martinez-Felipe, Z.B. Lu, P.A. Henderson, Stephen J. Picken, Ben Norder, Corrie T. Imrie, Amparo Ribes-Greus

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

A series of novel side chain liquid crystal copolymers, the poly[10-(4-methoxy-4'-oxy-azobenzene) decyl methacrylate]-co-poly[2-acrylamido-2-methyl-1-propanesulfonic acid]s (10-MeOAzB/AMPS-x/y) have been synthesised by free radical copolymerisation. The mol fraction of the sulfonic acid-based group, AMPS, has been varied over a broad range of composition in the copolymers, and these have been characterised using differential scanning calorimetry (DSC), polarised light microscopy (PLM), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray diffraction (XRD). The liquid crystal homopolymer and copolymers containing up to 0.54 mol fraction AMPS-based units, all exhibit a smectic A phase, while at higher mol fraction AMPS-based groups, liquid crystallinity is extinguished and the copolymers are amorphous. The local packing arrangements within the smectic A phase varies with composition attributed, in part, to phase separation between acid rich domains and liquid crystal regions. The dependence of the transitional properties on copolymer composition may be interpreted in terms of the packing efficiency of the mesogenic side chains and hydrogen bonding between the sulfonic acid groups, as a consequence of increasing the concentration of acid-based groups. (c) 2012 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)2604-2612
Number of pages9
JournalPolymer
Volume53
Issue number13
Early online date23 Feb 2012
DOIs
Publication statusPublished - 7 Jun 2012

Keywords

  • side chain liquid crystal copolymers
  • sulfonic acid
  • hydrogen bonding
  • methanol fuel-cell
  • polymer electrolytes
  • thermal-properties
  • transitional properties
  • ion-transport
  • backbone flexibility
  • nonmesogenic units
  • spacer length
  • ionomers
  • polystyrene

Cite this

Synthesis and characterisation of side chain liquid crystal copolymers containing sulfonic acid groups. / Martinez-Felipe, A; Lu, Z.B.; Henderson, P.A.; Picken, Stephen J.; Norder, Ben; Imrie, Corrie T.; Ribes-Greus, Amparo.

In: Polymer, Vol. 53, No. 13, 07.06.2012, p. 2604-2612.

Research output: Contribution to journalArticle

Martinez-Felipe, A ; Lu, Z.B. ; Henderson, P.A. ; Picken, Stephen J. ; Norder, Ben ; Imrie, Corrie T. ; Ribes-Greus, Amparo. / Synthesis and characterisation of side chain liquid crystal copolymers containing sulfonic acid groups. In: Polymer. 2012 ; Vol. 53, No. 13. pp. 2604-2612.
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abstract = "A series of novel side chain liquid crystal copolymers, the poly[10-(4-methoxy-4'-oxy-azobenzene) decyl methacrylate]-co-poly[2-acrylamido-2-methyl-1-propanesulfonic acid]s (10-MeOAzB/AMPS-x/y) have been synthesised by free radical copolymerisation. The mol fraction of the sulfonic acid-based group, AMPS, has been varied over a broad range of composition in the copolymers, and these have been characterised using differential scanning calorimetry (DSC), polarised light microscopy (PLM), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray diffraction (XRD). The liquid crystal homopolymer and copolymers containing up to 0.54 mol fraction AMPS-based units, all exhibit a smectic A phase, while at higher mol fraction AMPS-based groups, liquid crystallinity is extinguished and the copolymers are amorphous. The local packing arrangements within the smectic A phase varies with composition attributed, in part, to phase separation between acid rich domains and liquid crystal regions. The dependence of the transitional properties on copolymer composition may be interpreted in terms of the packing efficiency of the mesogenic side chains and hydrogen bonding between the sulfonic acid groups, as a consequence of increasing the concentration of acid-based groups. (c) 2012 Elsevier Ltd. All rights reserved.",
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AU - Martinez-Felipe, A

AU - Lu, Z.B.

AU - Henderson, P.A.

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AU - Norder, Ben

AU - Imrie, Corrie T.

AU - Ribes-Greus, Amparo

N1 - The authors thank the financial support of the Generalitat Valenciana, through the Grisolia and Forteza programs, and the Spanish Ministry of Science and Innovation, through the Research Projects ENE2007-67584-C03, UPOVCE-3E-013, ENE 2011-28735-CO2-01 and IT-2009-0074 and the awarding of two FPI and FPU pre-doctoral grants.

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N2 - A series of novel side chain liquid crystal copolymers, the poly[10-(4-methoxy-4'-oxy-azobenzene) decyl methacrylate]-co-poly[2-acrylamido-2-methyl-1-propanesulfonic acid]s (10-MeOAzB/AMPS-x/y) have been synthesised by free radical copolymerisation. The mol fraction of the sulfonic acid-based group, AMPS, has been varied over a broad range of composition in the copolymers, and these have been characterised using differential scanning calorimetry (DSC), polarised light microscopy (PLM), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray diffraction (XRD). The liquid crystal homopolymer and copolymers containing up to 0.54 mol fraction AMPS-based units, all exhibit a smectic A phase, while at higher mol fraction AMPS-based groups, liquid crystallinity is extinguished and the copolymers are amorphous. The local packing arrangements within the smectic A phase varies with composition attributed, in part, to phase separation between acid rich domains and liquid crystal regions. The dependence of the transitional properties on copolymer composition may be interpreted in terms of the packing efficiency of the mesogenic side chains and hydrogen bonding between the sulfonic acid groups, as a consequence of increasing the concentration of acid-based groups. (c) 2012 Elsevier Ltd. All rights reserved.

AB - A series of novel side chain liquid crystal copolymers, the poly[10-(4-methoxy-4'-oxy-azobenzene) decyl methacrylate]-co-poly[2-acrylamido-2-methyl-1-propanesulfonic acid]s (10-MeOAzB/AMPS-x/y) have been synthesised by free radical copolymerisation. The mol fraction of the sulfonic acid-based group, AMPS, has been varied over a broad range of composition in the copolymers, and these have been characterised using differential scanning calorimetry (DSC), polarised light microscopy (PLM), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray diffraction (XRD). The liquid crystal homopolymer and copolymers containing up to 0.54 mol fraction AMPS-based units, all exhibit a smectic A phase, while at higher mol fraction AMPS-based groups, liquid crystallinity is extinguished and the copolymers are amorphous. The local packing arrangements within the smectic A phase varies with composition attributed, in part, to phase separation between acid rich domains and liquid crystal regions. The dependence of the transitional properties on copolymer composition may be interpreted in terms of the packing efficiency of the mesogenic side chains and hydrogen bonding between the sulfonic acid groups, as a consequence of increasing the concentration of acid-based groups. (c) 2012 Elsevier Ltd. All rights reserved.

KW - side chain liquid crystal copolymers

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KW - hydrogen bonding

KW - methanol fuel-cell

KW - polymer electrolytes

KW - thermal-properties

KW - transitional properties

KW - ion-transport

KW - backbone flexibility

KW - nonmesogenic units

KW - spacer length

KW - ionomers

KW - polystyrene

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DO - 10.1016/j.polymer.2012.02.029

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VL - 53

SP - 2604

EP - 2612

JO - Polymer

JF - Polymer

SN - 0032-3861

IS - 13

ER -