木质纳米纤维素/石墨烯电热膜电热效应的调控及其构效机理

石墨烯电热膜具有较高的电热响应速率，在航空航天器件融雪除冰、材料热分析及除霜除雾等领域有重要需求。但存在柔韧性不足，电热效应的可控性不高及均匀稳定性欠佳等问题，制约其推广应用。本项目采用天然木质纳米纤丝纤维素（NFC）为骨架基体与石墨烯复合创制新型电热膜，利用NFC自交联成膜及其与石墨烯相互嵌插增固和互促均匀分散的作用，协同增强其柔韧性、热稳定性及电热效应可控、均匀稳定性；研究调制参数对电阻、电热性能及机械强度的影响，结合热/力阻效应分析，建立电热效应调控规律，通过阐明NFC-石墨烯结合程度的演变，构建温度分布模型量化表征网络体系分布均匀性，揭示调控机制；系统分析电热特性及其演变规律，表征电热作用过程NFC-石墨烯结合方式、微观形貌、物相结构及化学性质的变化，解析电热效应演变的构效机理，阐明NFC改善韧性和电热效应的机制，为改进工作性能和精度提供理论参考，推进纳米纤维素和石墨烯高值化利用。

Graphene electrothermal film was of high electric heating response rate and could meet these requirements such as melting snow and ice on aerospace device, materials thermal analysis and defrosting and demisting, but still existing some questions such as poor flexibility, low controllability, uniformity and stability in electrical heating effect, which was restricted with popularization and application. This project would use wooden nanofibrillated cellulose (NFC) as skeleton to prepare a kind of new-type electrothermal film by composite with graphene. The electrothermal film possessed excellent flexibility, thermal stability and adjustable-uniform-stable electrothermal effect, which benefited from facile couplet of NFC self and good insertion and dispersion between NFC and graphene. It was focused on that how modulation parameters impacted resistance, electrical-heating property and mechanical strength, heat/pressure effect was analyzed and electrothermal effect regulation law was established. Through characterization of building way of NFC-graphene network, temperature distribution model was built to make quantitative characterization of distribution uniformity of the network system, revealing regulatory mechanism. Through systematical analysis of electrothermal characteristics and its evolution law and characterization of combining ways of NFC-graphene, microstructure of the network system, change of phase structure and chemical properties in electrothermal process, structure-activity mechanism of electrical heating effect evolution would be revealed and mechanism for NFC improving toughness and electrothermal effect would be clarified, provide theoretical reference for improving working performance and precision, attaching NFC and graphene higher use value.