Preparation and Properties of PBAT/Gallic-Acid-Esterified Nanocellulose Composite Membranes
In this study,tris(acetyloxy)galloyl chloride was synthesized as the monomer,1-allyl-3-methylimidazolium chloride ionic liquid was the solvent.By adjusting the mass fractions of reactants and controlling the reaction conditions,the modified cellulose with a high substitution degree was prepared through the solution reactions.Subsequently,by controlling the regeneration conditions and deacetylation,the gallic-acid-esterified nanocellulose(PHNC10-1)with a high substitution degree was produced.Fourier transform infrared spectroscopy(FTIR),elemental analysis,and atomic force microscopy(AFM)confirmed the successful preparation of PHNC10-1.Then,PHNC10-1 was incorporated into poly(butylene adipate-co-terephthalate)(PBAT)to fabricate composite films via the solution casting method.Tensile performance tests show that when the mass fraction of PHNC10-1 is 2%,the composite film exhibits the best tensile properties.Compared with the PBAT film,the tensile strength and elongation at break of the composite film increaseby4.5%and7.0%,respectively.Further increasing the mass fraction of PHNC10-1,PHNC10-1 aggregates in the matrix,leading to a decrease of tensile properties of the composite film.Thermogravimetric analysis and thermo-oxidative aging tests indicate that PHNC10-1 could also effectively enhance the thermo-oxidative stability of PBAT.
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