Changes in the dielectric relaxations of water in epoxy resin as a function of the extent of water ingress in carbon fibre composites

P. Boinard, W.M. Banks, R.A. Pethrick

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Dielectric relaxation measurements are reported over a frequency range from 10-1 to 109 Hz as a function of exposure time for an epoxy resin-carbon fibre composite, ageing at 60C in water. Investigation of the nature of the dipole relaxation of the water molecules, indicates the nature of their interaction with the polymer matrix. Analysis of the dielectric relaxation spectra allow identification of processes that can be attributed to 'free' and 'bonded' water, water in micro-cracking, located in carbon fibre disbonds and plasticizing the polymer matrix. Identification of the various types of location in which water exists was aided by use of the Ng factor from the Kirkwood-Frölich equation, which describes the constraints on free dipole ration nature imposed by the environment in which it is located. These data indicate the power of the dielectric technique for quantitative analysis of water ingress into epoxy composites.
LanguageEnglish
Pages2218-2229
Number of pages11
JournalPolymer
Volume46
Issue number7
DOIs
Publication statusPublished - 2005

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Epoxy Resins
Dielectric relaxation
Epoxy resins
Carbon fibers
Water
Composite materials
Polymer matrix
carbon fiber
Aging of materials
Molecules
Chemical analysis

Keywords

  • epoxy resin
  • water ingress
  • dielectric relaxation spectroscopy
  • polymer science
  • chemistry
  • mechanical engineering

Cite this

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abstract = "Dielectric relaxation measurements are reported over a frequency range from 10-1 to 109 Hz as a function of exposure time for an epoxy resin-carbon fibre composite, ageing at 60C in water. Investigation of the nature of the dipole relaxation of the water molecules, indicates the nature of their interaction with the polymer matrix. Analysis of the dielectric relaxation spectra allow identification of processes that can be attributed to 'free' and 'bonded' water, water in micro-cracking, located in carbon fibre disbonds and plasticizing the polymer matrix. Identification of the various types of location in which water exists was aided by use of the Ng factor from the Kirkwood-Fr{\"o}lich equation, which describes the constraints on free dipole ration nature imposed by the environment in which it is located. These data indicate the power of the dielectric technique for quantitative analysis of water ingress into epoxy composites.",
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Changes in the dielectric relaxations of water in epoxy resin as a function of the extent of water ingress in carbon fibre composites. / Boinard, P.; Banks, W.M.; Pethrick, R.A.

In: Polymer, Vol. 46, No. 7, 2005, p. 2218-2229.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Changes in the dielectric relaxations of water in epoxy resin as a function of the extent of water ingress in carbon fibre composites

AU - Boinard, P.

AU - Banks, W.M.

AU - Pethrick, R.A.

PY - 2005

Y1 - 2005

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AB - Dielectric relaxation measurements are reported over a frequency range from 10-1 to 109 Hz as a function of exposure time for an epoxy resin-carbon fibre composite, ageing at 60C in water. Investigation of the nature of the dipole relaxation of the water molecules, indicates the nature of their interaction with the polymer matrix. Analysis of the dielectric relaxation spectra allow identification of processes that can be attributed to 'free' and 'bonded' water, water in micro-cracking, located in carbon fibre disbonds and plasticizing the polymer matrix. Identification of the various types of location in which water exists was aided by use of the Ng factor from the Kirkwood-Frölich equation, which describes the constraints on free dipole ration nature imposed by the environment in which it is located. These data indicate the power of the dielectric technique for quantitative analysis of water ingress into epoxy composites.

KW - epoxy resin

KW - water ingress

KW - dielectric relaxation spectroscopy

KW - polymer science

KW - chemistry

KW - mechanical engineering

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DO - 10.1016/j.polymer.2004.11.103

M3 - Article

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