Leaf and stem fibers of Sorghum halepense L. (SH) were investigated as fillers for recycled polypropylene (RPP) at 10, 20, 30 wt%. The effects SH in RPP on the thermal mechanical properties composites by tensile bending tests, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC). It was found that decreased but their elasticity modulus increased. addition to polymer matrix ...