Dual Light- and pH-Responsive Composite of Polyazo-Derivative Grafted Cellulose Nanocrystals
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Methods
2.2.1. Preparation of Cellulose Nanocrystals
2.2.2. Immobilization of Initiator on Cellulose Nanocrystals
2.2.3. Grafting of MMAZO from Initiator-Functionalized Cellulose Nanocrystals
2.2.4. Preparation of PMMAZO-Grafted CNCs/PU Films
2.2.5. Cleavage of Polymer Brushes from PMMAZO-grafted CNCs
2.2.6. Measurement of the Responsive Behavior of PMMAZO-Grafted CNCs and Their Composite
2.2.7. TEM, FT-IR, NMR, XPS, and EA Analysis
2.2.8. XRD, TGA, UV–VIS Absorption Spectra and GPC
3. Results and Discussion
3.1. Cellulose Nanocrystals Grafted with PMMAZO
3.2. Properties of the PMMAZO-Grafted CNCs
3.2.1. Crystal Structure and Thermal Analysis
3.2.2. pH-Responsive Properties of the PMMAZO-Grafted CNCs
3.2.3. Light-Responsive Behavior
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Sample | Conversion | Mn | PDI |
---|---|---|---|
PMMAZO-grafted CNCs | 32.5% | 18,791 | 1.27 |
Sample | Degree of Crystallinity (%) |
---|---|
Pure CNCs | 76.21% |
CNCs-IBBr | 66.49% |
PMMAZO-grafted CNCs | 48.41% |
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Liu, X.; Li, M.; Zheng, X.; Retulainen, E.; Fu, S. Dual Light- and pH-Responsive Composite of Polyazo-Derivative Grafted Cellulose Nanocrystals. Materials 2018, 11, 1725. https://doi.org/10.3390/ma11091725
Liu X, Li M, Zheng X, Retulainen E, Fu S. Dual Light- and pH-Responsive Composite of Polyazo-Derivative Grafted Cellulose Nanocrystals. Materials. 2018; 11(9):1725. https://doi.org/10.3390/ma11091725
Chicago/Turabian StyleLiu, Xiaohong, Ming Li, Xuemei Zheng, Elias Retulainen, and Shiyu Fu. 2018. "Dual Light- and pH-Responsive Composite of Polyazo-Derivative Grafted Cellulose Nanocrystals" Materials 11, no. 9: 1725. https://doi.org/10.3390/ma11091725