Addressing the challenge of fabricating a high content regenerated cellulose/nanomaterial composite: the magical effect of urea,Green Chemistry

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Addressing the challenge of fabricating a high content regenerated cellulose/nanomaterial composite: the magical effect of urea
Green Chemistry ( IF 9.3 ) Pub Date : 2020-06-05 , DOI: 10.1039/d0gc01539c
Kai Wu _{1,

2,

3,

4,

5} , Dingyao Liu _{1,

2,

3,

4,

5} , Feng Gong _{5,

6,

7,

8} , Chuxin Lei _{8,

9,

10,

11,

12} , Qiang Fu _{8,

9,

10,

11,

12}

Affiliation

The solution processing of macromolecular cellulose material with a high content of incompatible nanomaterial is essential for its functionalization; however, this is still very tricky. Herein, urea is, for the first time, found to enable a simultaneous high filler concentration (56 mg ml⁻¹), long-term stabilization, and the uniform dispersion of universal nanomaterials (i.e., pristine boron nitride nanosheets, graphene nanoplates, and carbon nanotubes) in an aqueous solution of cellulose, based on the tactful utilization of urea's non-covalent chemistry. Its N atom lone pair electrons and O atom empty orbital provide strong non-covalent interactions with nanomaterials, just like a dispersant; at the same time, it also serves as a protective additive for the low-temperature dissolution of cellulose into worm-like nanofibers, offering a volume exclusion effect. More interestingly, this small molecule could be totally removed during the regeneration process of cellulose, without any sacrifice of the composite's characteristics. These miscellaneous functions open up the gate for the green production of high-performance, multifunctional, and high-content regenerated cellulose/nanomaterial composites.

中文翻译：

解决制造高含量再生纤维素/纳米材料复合材料的挑战：尿素的神奇作用

具有高含量不相容纳米材料的大分子纤维素材料的固溶处理对于其功能化至关重要。但是，这仍然非常棘手。在这里，尿素首次被发现能够同时实现较高的填料浓度（56 mg ml ^-1），长期稳定和通用纳米材料的均匀分散（即，尿素非共价化学的触觉利用，纤维素水溶液中的原始氮化硼纳米片，石墨烯纳米片和碳纳米管）。它的N原子孤对电子和O原子空轨道提供了与纳米材料的强非共价相互作用，就像分散剂一样。同时，它还用作纤维素低温溶解到蠕虫状纳米纤维中的保护性添加剂，具有体积排阻作用。更有趣的是，这种小分子可以在纤维素的再生过程中被完全去除，而不会牺牲复合材料的特性。这些其他功能为绿色，高性能，多功能和高含量的再生纤维素/纳米材料复合材料的绿色生产打开了大门。

更新日期：2020-07-06

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