氨基改性纤维素纳米晶体的自组装行为研究

喻丽莎; 康艳辉; 何琛; 周金平

doi:10.11777/j.issn1000-3304.2020.20069

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氨基改性纤维素纳米晶体的自组装行为研究

论文 | 更新时间：2021-01-26

- 氨基改性纤维素纳米晶体的自组装行为研究
- Self-assembly Behavior of Amino Modified Cellulose Nanocrystals
- 高分子学报 2020年51卷第8期页码：921-932
- 作者机构：
  
  武汉大学化学与分子科学学院生物医用高分子材料教育部重点实验室　武汉 430072
- 作者简介：
  
  E-mail: zhoujp325@whu.edu.cn Jinping Zhou, E-mail: zhoujp325@whu.edu.cn
- 基金信息：
  
  国家自然科学基金(基金号 51473128)资助项目
- DOI：10.11777/j.issn1000-3304.2020.20069
  中图分类号：
- 纸质出版日期：2020-8，
  
  网络出版日期：2020-7-11，
  
  收稿日期：2020-3-16，
  
  修回日期：2020-5-6，
扫描看全文
喻丽莎, 康艳辉, 何琛, 周金平. 氨基改性纤维素纳米晶体的自组装行为研究[J]. 高分子学报, 2020,51(8):921-932.

Li-sha Yu, Yan-hui Kang, Chen He, Jin-ping Zhou. Self-assembly Behavior of Amino Modified Cellulose Nanocrystals[J]. Acta Polymerica Sinica, 2020,51(8):921-932.
喻丽莎, 康艳辉, 何琛, 周金平. 氨基改性纤维素纳米晶体的自组装行为研究[J]. 高分子学报, 2020,51(8):921-932. DOI： 10.11777/j.issn1000-3304.2020.20069.

Li-sha Yu, Yan-hui Kang, Chen He, Jin-ping Zhou. Self-assembly Behavior of Amino Modified Cellulose Nanocrystals[J]. Acta Polymerica Sinica, 2020,51(8):921-932. DOI： 10.11777/j.issn1000-3304.2020.20069.

摘要

采用硫酸水解法制备纤维素纳米晶体(CNC)，然后用环氧氯丙烷、氨水依次对其表面改性得到氨基改性的CNC (CNC-NH

)，进一步采用蒸发诱导自组装(EISA)法制备CNC-NH

薄膜. 通过偏光显微镜(POM)、原子力显微镜(AFM)、扫描电子显微镜(SEM)和流变测试对CNC-NH

悬浮液和薄膜的自组装行为进行研究. 结果表明，CNC-NH

为棒状粒子，氨基的引入提高了其热稳定性. 随着CNC-NH

悬浮液浓度增大，手性向列型液晶相逐渐形成，且干燥成膜后仍然能保持织态结构. 流变测试表明，CNC-NH

悬浮液显示独特的流变行为，可以观察到明显的相转变浓度和相转变温度. 此外，考察了超声时间对CNC-NH

悬浮液成膜的影响. 随着超声时间的延长，CNC-NH

膜由无色透明向虹彩色转变，且具有虹彩现象的膜对光的特殊波段产生吸收.

Abstract

Cellulose nanocrystals (CNCs) are a class of sustainable renewable nanomaterials with many advanced features

such as biodegradability

biocompatibility

large specific surface area

and outstanding mechanical properties. They have attracted significant interest due to their fascinating self-assembly behavior. In this work

amino modified CNCs (CNC-NH

) were prepared by reacting CNCs with epichlorohydrin and then with ammonia. The structure

morphology and self-assembly behavior of CNC-NH

in aqueous suspensions and solid films were investigated by UV-Vis spectroscopy

DLS

XRD

XPS

POM

AFM

SEM

TEM and rheology testing. The degree of substitution of amino groups was deternmined to be 0.048. CNC-NH

showed a rodlike morphology with the length (

) of (180 ± 75) nm and width (

) of (13 ± 5) nm

and the average aspect ratio (

) was nearly 13.8. CNC-NH

could be well dispersed in water and the

-potential was determined to be −28.0 mV

which could be stored for a long time due to the strong electrostatic repulsion. The chiral nematic liquid crystal was observed in the CNC-NH

suspensions as the solid content increased up to 1.75 wt%. The CNC-NH

suspensions displayed unique rheological properties

which were divided into three regions: isotropic

biphase and liquid crystal

with increasing solid content. Moreover

the evaporation-induced self-assembly (EISA) method was used to prepare CNC-NH

films. It was found that the liquid crystalline structure of CNC-NH

in colloidal suspension still maintained in the solid films. The iridescent color of the films could be tuned by the initial content of the suspension and the ultrasonic time. The iridescence and colored films were obtained only if the pitch length in the solid film was approximately that of the wavelength of visible light. This work provides a new way for the preparation of cellulose liquid crystal materials

and helps to understand the formation mechanism of the liquid crystal of the rodlike nanoparticles.

关键词

纤维素纳米晶体氨基改性自组装液晶虹彩膜

Keywords

Cellulose nanocrystalsAmino modificationSelf-assemblyLiquid crystalIridescent film

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