Recently, my country's scientific research team has made important progress in the field of nanocellulose thermal performance research, and has successfully improved the thermal stability and thermal conductivity of nanocellulose through chemical modification and composite technology, opening up a new path for its application in high-temperature environments. This breakthrough is expected to accelerate the innovative development of green materials and promote the transformation of multiple industries toward environmental protection and sustainable directions. Breakthrough Progress: High temperature resistance and high thermal conductivity nanocellulose are introduced. As a renewable bio-based material, nanocellulose has the advantages of lightweight, high strength and degradability, but its insufficient thermal stability (the traditional decomposition temperature is less than 300°C) limits its application in the field of high temperature. In this study, scientists successfully increased the thermal decomposition temperature of nanocellulose to above 350°C through surface chemical modification (such as phosphorylation, silanization) and nanocomposite technology (combined with graphene, boron nitride and other materials), and optimized its thermal conductivity to make it in electronic and construction

1. Overview TEMPO oxidation method is a highly efficient and highly selective nanocellulose preparation technology, which is widely used in the preparation of carboxylated nanocellulose (TOCN). By selective oxidation of the primary hydroxy group at C6 position in natural cellulose molecules, carboxyl functional groups are introduced, so that cellulose has better dispersibility, reactive activity and application functions. 2. Raw materials and pretreatment materials: Pretreatment steps for natural cellulose such as wood pulp, cotton pulp, bamboo pulp, agricultural waste: bleach and remove lignin, improve purity and reaction efficiency, weigh it after drying, prepare reaction 3. Oxidation reaction process parameters (take 1 gram of dry cellulose as an example) The amount of components is used as TEMPO0.016 g (0.1 mmol) catalyst, and start the free radical reaction NaBr0.1 g (1 mmol) synergistic catalysis to improve reaction efficiency N

# Mechanical properties of nanocellulose and their application prospects## 1. Introduction Nanocellulose (Nanocellulose) is an emerging bio-based nanomaterial, and has attracted widespread attention for its excellent mechanical properties. It mainly includes cellulose nanofibers (CNF), cellulose nanocrystals (CNC) and bacterial nanocellulose (BNC). It has advantages such as high strength, high modulus, low density and biodegradability, and has shown great potential in composite materials, flexible electronics, aerospace and other fields. This paper will explore the structural characteristics, enhancement mechanism and application prospects of nanocellulose from the perspective of mechanical properties. ## 2. Mechanical properties of nanocellulose### 2.1 The mechanical properties of high-strength and high-modulus nanocellulose are far superior to those of traditional cellulose materials. The theoretical elastic modulus of its single fiber can reach 150 GPa, and the tensile strength exceeds 2-3 G