The functional properties of the aramid-reinforced polymer composites depend primarily on the properties of the aramid reinforcing fibers, since the fraction of the fiber constituent in FRP is quite high, usually well above 30% by volume. The properties of the aramid fibers, in turn, depend on their chemical composition and manufacturing conditions: both of these determine the fibers physical structure and mechanical properties. The chapter
will focus on these issues. Some specific problems related to the fiber-matrix nteraction.in aramid-containing FRP will also be addressed.Fundação para a Ciência e Tecnologia (FCT) - post-doctiral grant SFRH/BPD/45252/2008 (to Nadya Dencheva)Fundação para a Ciência e Tecnologia (FCT) - bolsa licença sabatica SFRH/BSAB/812/2008 (to Zlatan Denchev
