NDLI: Modification of cellulose nanocrystal-reinforced composite hydrogels: effects of co-crosslinked and drying treatment

Content Provider	Springer Nature Link
Author	Yang, Jun Zhao, Jing Jing Zhang, Xue Ming
Copyright Year	2014
Abstract	The synthesis platform of composite hydrogels containing rigid reinforcing filler cellulose nanocrystals (CNCs) and polymer matrix polyacrylamide (PAM) has been proposed (Yang et al. in Cellulose 20:227–237, 2013). The features of CNCs as multifunctional crosslinkers and flexible polymer chain entanglements contributed to the unique arrangement of CNC/PAM clusters with reversible network structures. In this article, the chemical crosslinking agent N,N′-methylene-bisacrylamide (BIS) was added to obtain the dual crosslinked networks, and the mechanical properties of the resulting co-crosslinked hydrogels were examined by tailoring the CNC and BIS concentrations. The results indicated that the homogeneous dispersion of CNCs throughout the polymer matrix was disturbed in the presence of BIS, and the covalent crosslinkers led to weakness and brittleness of the hydrogels. Some new entanglements within the networks were formed after a simple drying treatment, which was verified by the greater tensile strength compared with the as-prepared ones. The mechanism for the formation of these new entanglements was ascribed to the irreversible rearrangement of the CNC/PAM network structure, whereas for co-crosslinked hydrogels no strength increment was observed after the drying treatment.
Starting Page	3487
Ending Page	3496
Page Count	10
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	21
Issue Number	5
e-ISSN	1572882X
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-07-24
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nanocomposites Hydrogels Cellulose Co-crosslink Drying treatment Bioorganic Chemistry Physical Chemistry Organic Chemistry Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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