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Chemical Interactions at the Interface Between a Carbon Fiber and a Boron Trifluoride-catalyzed Epoxy Matrix by Shiping Wang; Andrew Garton is a Materials Science article available to read on EtoBox.

What is Chemical Interactions at the Interface Between a Carbon Fiber and a Boron Trifluoride-catalyzed Epoxy Matrix about?

The cure of a tetrafunctional epoxy resin ( largely tetraglycidyldiaminodiphenylmethane, TGDDM ) , cross-linked with diaminodiphenylsulphone ( DDS ) and boron trifluoride/ethylamine (BF,EA) catalyst, is affected in a complex fashion by the presence of an oxidized carbon fiber surface. If the fiber is aged in a humid environment (25OC, 95% humidity) before coating with the matrix, the affinity of the oxidized fiber surface for water leads to destruction of the catalyst and retardation of the cure. This retardation is noticeable at lower humidities if the polymer content of the composite is reduced to < 20%. For oxidized fibers that are stored under ambient conditions (40% humidity), the retarding effect of water is overwhelmed by the catalytic effect of the acidic fiber surface. This activates the latent catalyst, increasing the rate of epoxy consumption and the proportion of the epoxyepoxy reaction relative to the epoxy-amine reaction. For the low-humidity case, even though the rate of chemical reaction is increased, vitrification of the matrix is retarded, implying that there is less cross-linking and more extended epoxy-epoxy sequences in the network. The proposed chemical change

Who reads Chemical Interactions at the Interface Between a Carbon Fiber and a Boron Trifluoride-catalyzed Epoxy Matrix?

Author

Shiping Wang; Andrew Garton

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0021-8995)

Published

1992

Language

EN

Field

Materials Science (Physical Sciences)