NDLI: Preparation of high-strength α-chitin nanofiber-based hydrogels under mild conditions

Content Provider	Springer Nature Link
Author	Chen, Chuchu Ya, Hiroyuki Li, Dagang Abe, Kentaro
Copyright Year	2015
Abstract	Previously, we reported the preparation of high-crystalline hydrogels from α-chitin nanofibers by a simple NaOH treatment at low temperatures. In the present study, mild conditions were applied to both α-chitin powder and nanofibers to make hydrogels using calcium chloride dehydrate-saturated methanol (Ca solvent). Interestingly, nanofibrillation of powder occurred during the treatment. Compared with the powder, here, both wet chitin nanofiber (WChNF) and methanol-treated chitin nanofiber (MChNF) sheets could easily form into hydrogels at room temperature without the reflux conditions. In this system, water was an important factor in limiting the destruction of chitin crystalline structures caused by calcium ions. This was evident in the WChNF-based hydrogel, which exhibited higher crystallinity and retained its original continuous nanofiber network structure. Finally, we examined the tensile properties of samples prepared from NaOH solution and Ca solvent in the wet state. Although the hydrogel made from Ca solvent was not formed via interdigitation, the WChNF-based one exhibited considerably high tensile strength at around 1.3 MPa, which was close to the NaOH/ethanol-treated sample (tensile strength: 1.8 MPa).
Starting Page	2543
Ending Page	2550
Page Count	8
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	22
Issue Number	4
e-ISSN	1572882X
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-05-14
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	α-chitin nanofiber Hydrogels Mild conditions High-strength Bioorganic Chemistry Physical Chemistry Organic Chemistry Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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