纳米纤维素分散的高稳定性单片层黏土分散液的制备及其在透明柔性薄膜的应用

以天然的纳米纤维素（NFC）为分散剂，利用其亲水亲油的特性，将其用于剥离和分散片层黏土，成功攻克单片层黏土易发生絮聚的缺陷，高获得率制备出NFC分散的具有优异稳定性的单片层黏土分散液，并采用AFM和TEM对NFC和单片层黏土的形貌进行表征。最后，将单片层黏土分散体与NFC结合成功制备出一种高透明柔性薄膜。当单片层黏土含量为50wt%时，NFC/单片层黏土复合薄膜在600~800 nm波长下的透光率高达90%，且呈现较低的雾度。此外，该薄膜还具有优异的紫外阻隔能力，在紫外区能完全阻隔短波紫外线（UVC，波长为100~290 nm），阻隔大部分中波紫外线（UVB，波长为290~320 nm）。NFC分散的具有优异稳定性的单片层黏土分散液的成功制备，将有助于拓展纳米黏土的应用领域及提高单片层黏土基复合材料的性能。

Preparation of nanofibrillated cellulose dispersed monolayer clay nanoplatelet dispersion with high stability and its application in transparent flexible films

Using amphiphilic nanofibrillated cellulose (NFC) as a green dispersing agent to exfoliate and disperse layered clay in water. The NFC-dispersed monolayer clay nanoplatelet dispersion with excellent stability and high yield was obtained, and the morphologies of NFC and NFC-dispersed monolayer nanoclay suspension were characterized with AFM and TEM. Herein, NFC and NFC-dispersed monolayer clay nanoplatelets were combined to prepare highly transparent flexible film. As the content of monolayer clay nanoplatelets is 50wt%, the resultant NFC/monolayer clay nanoplatelet compound film exhibits about 90% transparency at 600-800 nm and a low transmission haze. NFC/monolayer clay film presents excellent ultraviolet screening properties, which can completely blcoks ultraviolet C (UVC, 100-290 nm) and most of ultraviolet B (UVB, 290-320 nm). The successful preparation of NFC-dispersed stable monolayer clay nanoplatelet dispersion will not only expand their application fields but also improve the performance of monolayer nanoclay matrix composites.