| Abstract:Cellulose paper is a flexible and biodegradable two-dimensional material widely studied in fields such as novel wearable devices. However, its thermal conductivity is low, which can be improved by adding boron nitride nanosheets (BNNS). Directly incorporating BNNS presents challenges such as low retention rates and uneven distribution, making it difficult to establish sufficient thermal conduction pathways, resulting in a lower thermal conductivity for the paper. In this study, cationic cellulose pulp (CMCF) was combined with chitosan-modified boron nitride nanosheets (COSBNNSs) to facilitate the formation of thermal conduction pathways. Cationic cellulose was prepared by reacting 3-chloro-2-hydroxypropyl trimethyl ammonium chloride with wood pulp cellulose, while COSBNNSs were synthesized using chitosan-assisted ball milling of hexagonal boron nitride. COSBNNSs were retained in the substrate (CMCF) through electrostatic and physical adsorption. When the content of COSBNNSs reached 30%, the resulting CMCF/COSBNNSs composite paper achieved a maximum thermal conductivity of 2.07 W/m*K and a tensile strength of 30 MPa, demonstrating high mechanical strength and thermal conductivity, thus showing potential as a thermal management substrate. |