Preparation and Properties of Microcrystalline Cellulose/Modified Nanohydrotalcite/Polyvinyl Alcohol Antibacterial Films
The work aims to prepare microcrystalline cellulose(MCC)/modified nano hydrotalcite(SA-SDS-LDH)/polyvinyl alcohol(PVA)films and investigate factors affecting the properties of the films.The microcrystalline cellulose(MCC)was extracted from peanut shells using the sodium hydroxide hypochlorite method.Nanopowders(SA-SDS-LDH)that were intercalated with sorbate(SA)and dodecyl sulphate(SDS)were prepared using the roasting recovery method and a composite film MCC/SA-SDS-LDH/PVA was prepared using the solution casting method.Fourier transform infrared spectroscopy,differential thermal and scanning electron microscopy were used to characterize the structure,thermal stability,and morphology of the film,and the mechanical properties,water absorption rate,dissolution rate,and antibacterial properties of the composite film were tested.MCC and SA-SDS-LDH were more compatible with the PVA film.The addition of SA-SDS-LDH enhanced the thermal stability of the PVA film,and the addition of both MCC and SA-SDS-LDH enhanced the water resistance of the PVA film.The mechanical properties of the composite film with 1％MCC and 4％SA-SDS-LDH were better than those of pure PVA films.The composite films show the best bacterial inhibition effect when MCC and SA-SDS-LDH are added at 3％and 4％,respectively.The MCC/SA-SDS-LDH/PVA film has better antibacterial,mechanical,water resistant,thermally stable properties.It provides a kind of antibacterial films with excellent performance for food packaging.
microcrystalline celluloseintercalation modificationnano-hydrotalcitespolyvinyl alcohol antibacterial film
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