The interaction between fiber and matrix considerably influences the mechanical properties of reinforced composites.

The mechanical properties of biocomposites depend on a number of factors such as the quantity and type of fiber added to the material, nature and amount of polymer matrix has been pointed as the most important parameters, but also the distribution and orientation of reinforcing fillers, nature of filler-matrix interfaces, interphase region and temperature of production influences the mechanical properties of the biocomposites. The amount of coupling agents (required to make the adhesion be­tween surface of fiber and matrix) in the composite is dependent on the fiber content and type and also influences the mechanical and other physical properties of the composites.