Iridescent Cellulose Nanocrystal Films Modified with Hydroxypropyl Cellulose.,Biomacromolecules

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Iridescent Cellulose Nanocrystal Films Modified with Hydroxypropyl Cellulose.
Biomacromolecules ( IF 5.5 ) Pub Date : 2020-02-26 , DOI: 10.1021/acs.biomac.0c00056
Christopher M Walters ₁ , Charlotte E Boott ₁ , Thanh-Dinh Nguyen ₁ , Wadood Y Hamad ₂ , Mark J MacLachlan _{1,

3,

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Affiliation

The introduction of polymers into a chiral nematic cellulose nanocrystal (CNC) matrix allows for the tuning of optical and mechanical properties, enabling the development of responsive photonic materials. In this study, we explored the incorporation of hydroxypropyl cellulose (HPC) into a CNC film prepared by slow evaporation. In the composite CNC/HPC thin films, the CNCs adopt a chiral nematic structure, which can selectively reflect certain wavelengths of light to yield a colored film. The color could be tuned across the visible spectrum by changing the concentration or molecular weight of the HPC. Importantly, the composite films were more flexible than pure CNC films with up to a ten-fold increase in elasticity and a decrease in stiffness and tensile strength of up to six times and four times, respectively. Surface modification of the films with methacrylate groups increased the hydrophobicity of the films, and therefore, the water stability of these materials was also improved.

中文翻译：

羟丙基纤维素改性的彩虹色纤维素纳米晶体薄膜。

将聚合物引入手性向列型纤维素纳米晶体（CNC）基质可以调节光学和机械性能，从而开发出响应性光子材料。在这项研究中，我们探索了将羟丙基纤维素（HPC）掺入通过缓慢蒸发制备的CNC膜中的方法。在复合CNC / HPC薄膜中，CNC采用手征性向列结构，该结构可以选择性地反射某些波长的光以产生彩色膜。通过更改HPC的浓度或分子量，可以在可见光谱范围内调整颜色。重要的是，复合膜比纯CNC膜更具柔韧性，其弹性最多增加10倍，刚度和拉伸强度分别下降6倍和4倍。

更新日期：2020-02-26

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