Preparation and characterization of multifunctional cellulose-based materials modified by hyperbranched polyamide

This paper explores the preparation and characterization of cellulose-based materials modified by hyperbranched polyamide (HBPA). Firstly, an alkaline urea solution was prepared to dissolve bacterial cellulose (BC) at low temperature. Then, after being modified by HBPA, BC hydrogel was hot pressed to form a cellulose-based film (BCF). The results show that the tensile strength of BCF without modification reaches 11.22 MPa, the piezoelectric performance is manifested as an open-circuit voltage of 0.45 V and a maximum short-circuit current density of 48.7 μA/cm², while the maximum tensile strength of the cellulose-based film modified by HBPA is 15.51 MPa, and the piezoelectric performance is enhanced. The open-circuit voltage is 1.09 V, and the maximum short-circuit current density is 1.4 mA/cm². After modification by HBPA, the thermal decomposition temperature is maintained at around 270 °C. Under excitation fluorescence effect is produced at a wavelength of around 450 nm. Moreover, the maximum oxygen index reaches 55.60, the air permeability is 1.652 × 10^-4 cm³/(m²·d·Pa), and the modified film has inhibitory effects on both Staphylococcus aureus and Escherichia coli.