Nanomechanical Investigation of Rubber-modified Epoxy Resins
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Epoxy resins have a broad application scope due to the wide range of
properties which can be easily modified by mixing various basic components
- e.g. to modify the toughness of epoxy resins rubber auxiliaries
This study focused on epoxy mixtures based on a bisphenol A diglycidyl
ether cured with diethyltoluenediamine with various amounts
of nitrile rubber. Both, morphology and the mechanical properties of
these two phase systems were examined with scanning force microscopy
In SFM phase images the epoxy phase was clearly distinguished from
the rubber phase. The nitrile rubber formed spherical domains in the
epoxy matrix. Phase separation occurred also in the rubber matrix.
Mechanical properties of both phases were quantified by nanoindentation
experiments. In addition, the influence of different amounts of
rubber additive on the toughness of the epoxy matrix was examined.