
148 Green Composites from Natural Resources
properties in comparison with hemp ber. Moreover, yarns of 1000 Tex thickness are
more difcult to impregnate and contribute to linear drop in ultimate exural stress.
7.4 NATURAL FIBER COMPOSITE WEATHERING
Many organisms and microorganisms use cellulose as a source of energy by degrad-
ing it to glucose in enzymatic processes (Beguin 1990). The natural degradation of
cellulose allows biomass circulation in the system and at the same time degrades
the properties of cellulose-based man-made materials. In order to prevent property
deterioration, treatments, additives, and inhibitors are used or the mat ...