In order to optimize the adhesion to an epoxy matrix, Twaron(R) aramid
fibre requires a pretreatment with an epoxy/hardener solution. The ch
emical composition of the pretreated fibre surface was analysed using
X-ray photoelectron spectroscopy and static imaging secondary ion mass
spectrometry. To this end model epoxy monomers were synthesized and u
se was made of a fluorine-labelled hardener. The effects of processing
steps such a's ageing of the pretreatment solution and curing of the
epoxy/hardener at the fibre surface have been systematically analysed.
Our results show that polar interactions between the aramid and epoxy
molecules play a dominant role in the interfacial adhesion mechanism.
There is evidence to suggest that the epoxy layer introduced onto the
surface of the Twaron(R) filaments is inhomogeneous as a result of th
e processing conditions.