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Cellulose microcrystal extracted from sisal fibers (SFCM) and octa-aminopropyl polyhedral oligomeric silsesquioxane (POSS-NH2) nanoparticles are used to fabricate SFCM/POSS hybrids through a simple cross-linking graft reaction.Epoxy chloropropane as cross-linking agent is used in the graft reaction.The chemical structure,morphology,and thermal property of SFCM/POSS hybrids are characterized with FTIR spectra,X-ray diffraction,SEM,TGA and DSC.The results show that the POSS-NH2 has been grafted on to the surface of SFCM forming novel macromolecular structures coated by POSS nano-silica particles.POSS particles are evenly dispersed at nanometer scale in the cellulose host matrix,bonding to the cellulose through covalent bonds.The thermal properties of the SFCM/POSS hybrids are improved.The maximum thermal decomposition temperature of SFCM/POSS hybrids is 366.9 ℃ higer than 347.9 ℃ of SFCM.The residual mass of SFCM/POSS hybrids and SFCM were 15.59 wt% and 4.41wt% at 700℃ respectively.