This research is primarily based on the search for alternative natural reinforcements to polymeric composites. This study begins with a complete characterization of the licuri fiber as an alternative reinforcement to polymeric composites. It then investigates the development of a composite laminate made solely from licuri fibers to understand the behavior of the fiber when impregnated in thermosetting resin (orthophthalic unsaturated polyester resin). The composite was developed as a lamina (a sheet with a single reinforcement layer) and industrially manufactured. The fibers were studied to determine their physical, chemical, and mechanical properties. The mechanical properties of the lamina were determined by uniaxial tensile and three-point bending tests. Macroscopic and microscopic (SEM) studies of the fracture were carried out to determine the influence of fiber/matrix interfacial adhesion on the final composite for both loads.

The gradual replacement of conventional materials with composite materials has become a concern due to their response to adverse environmental conditions, such as ultraviolet radiation, high temperature, and humidity. In this context, composite laminate using ortho-terephthalic polyester resin as matrix, reinforced with two layers of unidirectional woven licuri fiber, was submitted to accelerated environmental aging in order to study the influence of environmental degradation on mechanical properties, morphology, and fracture characteristics. Age-related morphological degradation of composite laminate was studied based on microscopic analysis of the microstructure and mass loss. In general, the licuri fiber reinforced plastics exhibited certain advantages in its responses to environmental aging. These advantages are evident in behavior related to photo-oxidation and microstructure degradation. Losses were recorded in the mechanical properties of the aged laminate when compared to the original condition; however, the structural integrity was little affected.