纤维素纳米晶/1,3-丁二醇复合结构彩膜的制备及湿度响应,Journal of Applied Polymer Science

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纤维素纳米晶/1,3-丁二醇复合结构彩膜的制备及湿度响应
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-05-25 , DOI: 10.1002/app.52645
Tianhui Wang _{1,

2,

3} , Xiangnan Meng _{1,

2,

3} , Shuyu Lu _{1,

2,

3} , Tao Ma _{1,

2,

3} , Xinna Hu _{1,

2,

3} , Yi Song _{1,

2,

3}

Affiliation

纤维素纳米晶体（CNCs）可以在水溶液中自组装形成手性向列液晶结构，并保持在随后的固体虹彩薄膜中，呈现出独特的结构颜色。本研究为了探究超声对CNC光学性能的影响，采用超声辅助分散和自然静态蒸发的方法制备了具有手性向列螺旋结构和不同结构颜色的CNC薄膜。结果表明，延长超声波持续时间会显着增加层间距并使 CNC 薄膜的颜色发生红移，这可能是由于空间位阻增加和双电层更大。在此基础上，制备了CNC/1,3-丁二醇(BG)复合膜，其颜色均匀、结构均匀。结果表明，BG 最有可能通过氢键结合到 CNCs 中。此外，BG的存在增加了CNC/BG复合薄膜的层间距和结构色红移，表明薄膜的结构色对湿度具有良好的稳定性响应。总体而言，我们的工作为理解超声波和小分子添加剂在制备 CNC 基薄膜中的作用提供了新的视角。

"点击查看英文标题和摘要"

The preparation of cellulose nanocrystal/1,3-butylene glycol composite structural color films and humidity-responsive

Cellulose nanocrystals (CNCs) can self-assemble in an aqueous solution to form a chiral nematic liquid crystal structure, which is maintained in the subsequent solid iridescent film and presents a unique structural color. In this study, in order to explore the effect of ultrasound on the optical properties of CNC, CNC films with a chiral nematic helix structure and different structural colors were prepared by ultrasonic-assisted dispersion and natural static evaporation. Results showed that prolonging the ultrasonic duration significantly increased layer pitches and red-shifted the color of CNC films, likely due to increased steric hindrance and a larger electric double layer. On this basis, CNC/1,3-butylene glycol (BG) composite films were prepared with uniform and structural color. Results showed that BG was incorporated into CNCs most likely through hydrogen bonds. Moreover, the presence of BG increased the layer pitches and red-shifted the structural color of CNC/BG composite films, which indicates that structural color of the film has a good stability response to humidity. On the whole, our work provides a new point of view in understanding the role of ultrasound and small-molecule additives in the preparation of CNC-based films.

更新日期：2022-05-25

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