纤维素纳米纤丝（CNF）作为一种可再生和可生物降解的纳米材料，以其优异的性能在多领域显示出巨大的应用潜力。但CNF受热不稳定导致其复合材料加工温度范围窄（200℃以下），这一直是CNF基纳米复合材料加工亟待解决的瓶颈问题，是限制其商业化应用的重要因素。在前期的工作基础上，本项目拟通过调控纤维素晶型结构、纤维素结晶度以及半纤维素和木质素的存在形式，探讨纤维微结构及组分对CNF热稳定性的影响规律，阐明CNF热稳定性的影响机理，解析CNF热稳定性的微观调控机制。研究成果对于实现CNF高值化利用具有重大意义，将为改善CNF及CNF基纳米复合材料热稳定性提供基础理论依据。

As a renewable and biodegradable nanomaterial, cellulose nanofibrils (CNF) has shown great potential in many fields for its excellent performance. However, the thermal instability of CNF leads to a narrow processing temperature range of CNF composites (below 200 °C), which has been a bottleneck problem in the processing of CNF-based nanocomposites, and is an important factor limiting its commercial application. Based on our previous works, this project intends to investigate the influence of fiber microstructure and composition on the thermal stability of CNF by regulating the crystal structure and crystallinity of cellulose, and the existence of hemicellulose and lignin. The influence mechanism of CNF thermal stability will be clarified and the microscopic regulation mechanism of CNF thermal stability will be resolved. The research results are of great significance for realizing the high value utilization of CNF, and will provide a theoretical basis for improving the thermal stability of CNF and CNF-based nanomaterials.