Treatment with APS and AAPTSThese treatments used 0.2 mol L−1concentration of silanesolution. The solution was prepared by adding APS or AAPTS(0.2 mol L−1) in an 80/20 (v/v) ethanol/water mixture. It was thenprehydrolyzed at room temperature for 24 h. The sisal fibers (1 g)were placed in a beaker and 100 mL of silane solution was added.The mixture was then kept at room temperature for 72 h. After thesilane treatment, the fibers were washed several times in an 80/20(v/v) ethanol/water mixture. Subsequently, the fibers were sub-mitted to a 24 h Soxhlet extraction in ethanol in order to removeunreacted