Microcrystalline cellulose (MCC) was prepared by acid hydrolysis of waste cotton fabric with 2.5 N hydrochloric acid at temperature of 100 OC for 3 hours. The white residue obtained was washed repeatedly with distilled water to obtain acid-free MCC. The MCC was then dried in a vacuum oven to constant weight and ground into fine powder. Then, the MCC was swollen in urea solution before coupling with hexadecyl triethoxysilane at 80 OC, 1 h. Silane to MCC mole ratios of 1: 1, 1: 2, 1: 3, and 1:4 were employed. Hydrochloric acid was used to adjust pH to 1. The silane treated microcrystalline cellulose (SiMCC) was characterized by Fourier transform infrared spectroscopy (FTIR) in the range 450–4000 cm-1, The MCC/PP composite and SiMCC/PP composites were prepared by twin screw operating at 180-210 oC and 100 rpm using co-rotating mode. Melt flow index (MFI) was determined by melt flow index