Interfacial Shear Strength in Lignocellulosic Fibers Incorporated Polymeric Composites

Abstract

Lignocellulosic fibers have been recognized as attractive fillers for different types of matrices in polymeric composites. Their advantages such as recyclability and renewability are unique characteristics for composites used as automobile components and building structural panels. In view of the hydrophobic behavior of most polymers and the hydrophilic nature of lignocellulosic fibers, poor adhesion is observed between lignocellulosic fibers and the polymeric matrix, which results in lower mechanical properties. Pullout tests have been successfully used to determine the interfacial shear stress in synthetic fiber-reinforced composites, but little has been reported in the case of lignocellulosic fiber–polymer composites. This chapter presents an overview on the determination of the interfacial strength of lignocellulosic fibers–polymer matrix composites including some obtained by the authors on Brazilian fibers such as curaua, ramie, and piassava, considered as reinforcement for composites. Concluding remarks and suggestions indicate some future works.