Abstract
The production of biodegradable PBAT composites with high gas barrier properties is currently a challenge. In this study, PBAT membranes with improved gas barrier properties were fabricated by incorporating surface-modified cellulose nanofibres (CNF). The modified CNF (CNPH) was prepared by surface grafting of Poly(−3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) chains. Surface chemical changes and improved wettability of CNPH after the grafting reaction were verified using Fourier Transform Infrared Spectroscopy (FTIR), X-ray Photoelectron Spectroscopy (XPS), Water Contact Angle Measurement (WCA) and Transmission Electron Microscopy (TEM). The PBAT/CNPH composite membranes exhibited improved crystalline properties, water vapor barrier and oxygen barrier, which could be attributed to the PHBV chains on the CNPH nanoparticles, leading to improved dispersion and enhanced interfacial interactions between the nanoparticles and the PBAT matrix. These biocomposites showed excellent effectiveness in edible mushroom fresh-keeping packaging. This study presents a stable and environmentally friendly process for the modification of CNF using PHBV, as well as a viable strategy for designing fully biodegradable multifunctional composites.
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