高性能透明柔性纳米纤维素/层状硅酸盐复合膜有序结构的构筑与调控机制

高性能透明柔性纳米纤维素（NFC）/层状硅酸盐复合膜是柔性电子的理想衬底之一。然而，层状硅酸盐的引入会使薄膜内部产生无序结构，导致复合膜性能（如光学和力学）的急剧下降。为解决这一困难，本项目拟通过NFC/层状硅酸盐复合膜有序结构的构筑及其调控机制的阐明，来实现高性能透明柔性复合膜的制备。研究内容有：1羧基含量可调范围广、聚合度高的NFC的研究；2NFC剥离分散层状硅酸盐的研究，重点阐明NFC对单片层硅酸盐的分散机理，高得率制备出稳定的单片层硅酸盐分散体；3复合膜有序结构构筑的研究，将1与2中获得的原料混合构筑薄膜有序结构，重点研究NFC与单片层硅酸盐的界面相互作用，揭示复合膜有序结构的调控机制；4高性能透明柔性复合膜的制备及其应用于氧化物薄膜晶体管的研究。本项目将为构筑高性能NFC/层状硅酸盐复合膜提供科学依据和理论指导，对推动柔性电子朝着低成本、绿色、多功能方向发展具有重要的现实意义。

High performance transparent and flexible nanofibrillated cellulose (NFC)/layered silicate composite film is one of most promising alternative substrates for flexible electronics. However, the incorporation of layered silicates into NFC tends to form disordered structure in composite film that leads to the dramatic decrease in its performance such as optical and mechanical properties. To overcome this challenge, this study attempts to produce ordered structure in composite film while exploring the underlying mechanism of modulating the ordered structure, aiming to prepare high performance transparent and flexible composite film. Research content includes: 1 investigating in the preparation of high degree of polymerization NFC with broad modulable contents of carboxyl groups. 2 Study on the use of NFC in the exfoliation and dispersion of layered silicates, with a special focus on understanding the dispersive mechanism of NFC for aqueous single-layer silicates that is beneficial for the preparation of highly stable aqueous individual silicates with high yield. 3 The construction of ordered structure of composite film. Blending NFC prepared in section 1 with aqueous NFC-dispersed individual silicate suspension obtained in section 2 to prepare composite films with ordered structure. Great efforts have been devoted to unveiling the principle of modulating the ordered structure by investigating the interfacial interactions between NFC and individual silicates. 4 The preparation of high performance transparent and flexible composite film and its application in oxide thin film transistors as a “green” substrate. This works will provide theoretical guidance and scientific foundation for preparing high performance NFC/layered silicate composite film and is of significance to enable flexible electronics to be low cost, green, and multifunctional.