Dielectric monitoring during the cure of epoxy resin blends

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dc.contributor.advisor Partridge, Ivana K.
dc.contributor.advisor Block, H.
dc.contributor.author Maistros, G. M.
dc.date.accessioned 2016-08-24T09:19:17Z
dc.date.available 2016-08-24T09:19:17Z
dc.date.issued 1991-10
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/10403
dc.description.abstract Dielectric monitoring and supporting techniques (differential Scanning calorimetry, infra-red spectrosoopy, viscometry, dynamic mechanical thermal analysis and light transmittance) were used to study the isothermal cure reaction of the CTBN rubber modified DGEBA resin/amine hardener blends. The neat system was also examined for the required knowledge of the matrix properties. The complexity of the cure kinetics was demonstrated by the use of a rapid technique for kinetic parameters evaluation. The utility of the dielectric cure monitoring is focused at the observation of evidence o phase separation, gelation and vitrification. The phase separatlon which the blends underwent during the cure was detected by the dielectric »monitoring through a permittivity increase at the low frequency response. The onset of the rapid viscosity increase leading to gelation was also indicated by the sharp decrease o the dielectric constant atlhigh frequencies. The frequency dependence of the times reach the dielectric loss peaks was used to predict successfully the vitrification times during the isothermal reactions o the blends. The in-situ nature o the technique and the basic understanding o the features appearing in the dielectric signal during the cure reaction provide the basis for the use of dielectric monitoring in the process of composite materials, manufacture. en_UK
dc.language.iso en en_UK
dc.publisher Cranfield University en_UK
dc.rights © Cranfield University, 1991. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder. en_UK
dc.title Dielectric monitoring during the cure of epoxy resin blends en_UK
dc.type Thesis or dissertation en_UK
dc.type.qualificationlevel Doctoral en_UK
dc.type.qualificationname PhD en_UK

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