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High pressure liquid and gel permeation chromatography, together with infrared studies on particular chromatography fractions, has been used to study two nitrile-epoxy adhesives. One of these materials has been available for some fifteen years while the other is a more modern development. A detailed consideration of the distribution of epoxy oligomers has indicated a change from taffy to fusion process DGEBA resins in recent times. Study of the acrylonitrile content of high molecular weight fractions has shown that whereas the older adhesive only contains a carboxylated nitrile rubber, the newer system also contains some carboxy-terminated polybutadiene.
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Morris et al. (1982) studied this question.
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