Abstract
Herein, antibacterial bioplastic derived from lignin, poly(butylene succinate-co-butylene terephthalate) (PBST) was functionalized with the antibacterial lignin- g - (polyhexamethylene guanidine) (Lignin- g -PHMG). The Lignin- g -PHMG was synthesized by a facile grafting reaction. The epoxidized lignin provided sufficient reactive sites for the amine groups on PHMG. The structure of Lignin- g -PHMG was confirmed by Fourier-Transform Infrared Spectra (FT-IR) and X-ray Photoelectron Spectroscopy (XPS). The antibacterial bioplastics were developed by introducing Lignin- g -PHMG into the matrix of PBST and lignin. The composite bioplastics exhibited good mechanical performance, with a tensile strength of 20.69 MPa and an elongation at break of 414.88%, respectively. Moreover, the composite films revealed good antioxidant properties, and a highly efficient scavenging rate of 98.21% was detected for DPPH free radicals. The bacterial inhibition by the bioplastic composite films demonstrated a synergistic antibacterial effect between lignin and Lignin- g -PHMG on E. coli and S. aureus . Furthermore, the inhibition zone test indicated that the bioplastic composite could provide a durable and nonleaching antibacterial performance. Therefore, this study contributes to the conversion of lignin into multifunctional composites with potential antioxidant and antimicrobial applications. • A novel lignin-based antibacterial agent was prepared by graft lignin and PHMG. • Lignin/PBST composites were prepared by melt blending with good overall performance. • Lignin enhanced PBST matrix and facilitate the high value-added application of lignin.
Published Version
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