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Responsiveness, swelling, and mechanical properties of PNIPA nanocomposite hydrogels reinforced by nanocellulose

Published online by Cambridge University Press:  24 April 2015

Yi Chen*
Affiliation:
Key Laboratory of Advanced Materials and Technology for Packaging, Packaging and Materials Engineering Institute, Hunan University of Technology, Zhuzhou 412008, China; and Institute of Polymer Research, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
Weijian Xu
Affiliation:
Department of Chemical Engineering and Technology, Institute of Polymer Research, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
Wenyong Liu
Affiliation:
Key Laboratory of Advanced Materials and Technology for Packaging, Packaging and Materials Engineering Institute, Hunan University of Technology, Zhuzhou 412008, China
Guangsheng Zeng
Affiliation:
Key Laboratory of Advanced Materials and Technology for Packaging, Packaging and Materials Engineering Institute, Hunan University of Technology, Zhuzhou 412008, China
*
a)Address all correspondence to this author. e-mail: yiyue514@aliyun.com
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Abstract

Nanocrystalline cellulose (NCC) whisker obtained from acid hydrolysis of cotton was incorporated into the freezing polymerized PNIPA/clay hydrogels to prepare inorganic–organic hybrid nanocomposite hydrogels (named as C-NC gels). The influence of NCC on the properties of C-NC gels was investigated systematically. It was found that all C-NC gels exhibit similar lower critical solution temperature as that of NCC-free gels, being independent of the NCC content. However, with the increase of NCC content in C-NC gels, the swelling ability of gels decreases slightly while the response rate of gels increases gradually, the gels with high content of NCC exhibit an ultrarapid deswelling rate due to the amount of interconnected micropores appeared inside the gels. Moreover, the enhancement effect of increased NCC on the gels is significant, which is also determined by the swelling degree of gels directly. Comparably, for the gels with the same content of NCC, higher strength was found when the gels were kept in lower swelling ratio due to the stronger interaction of NCC through hydrogen bond in the gels.

Type
Articles
Copyright
Copyright © Materials Research Society 2015 

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Footnotes

Contributing Editor: Sanjay Mathur

References

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