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

doi:10.1016/j.polymer.2004.11.103

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 journal › Article › peer-review

42 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.

Original language	English
Pages (from-to)	2218-2229
Number of pages	11
Journal	Polymer
Volume	46
Issue number	7
DOIs	https://doi.org/10.1016/j.polymer.2004.11.103
Publication status	Published - 2005

Keywords

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

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10.1016/j.polymer.2004.11.103

http://dx.doi.org/10.1016/j.polymer.2004.11.103

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

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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AU - Boinard, P.

AU - Banks, W.M.

AU - Pethrick, R.A.

PY - 2005

Y1 - 2005

N2 - 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.

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

UR - http://dx.doi.org/10.1016/j.polymer.2004.11.103

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DO - 10.1016/j.polymer.2004.11.103

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JO - Polymer

JF - Polymer

SN - 0032-3861

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