Comparison of Interfacial Adhesion Between Polyester and Epoxy Matrix Composites Reinforced with Fique Natural Fiber

Abstract

Polyester and epoxy resins are thermosetting polymers extensively used as composite materials matrices. The advantage of the polyester resin in comparison with the epoxy matrix is its lower cost. On the other hand, its permeability can be considered a disadvantage, once as the solvents dry the resin becomes more porous. This represents a direct impact on its mechanical properties. Epoxy resin has no solvents and its polymerization occurs only when two components are mixed, resin and hardener. The processing of this type of polymer requires control of temperature and humidity during its production. Polyester resin continues to cure over time, are prone to cracking and breaking, while epoxy resin once cured retains its full properties. The current pullout tests were performed to compare the interfacial adhesion of fique fibers with epoxy and polyester polymer matrix. The results indicated a critical length approximately 65% higher for the fique fiber/polyester in comparison to fique fiber/epoxy as well as an interfacial strength 4.9 times higher, which may indicate stronger adhesion of fique fiber with epoxy resin.