Synthesize and properties of photosensitive organic solvent soluble acylated chitosan derivatives (2)

Ma, Guiping; Liu, Yang; Kennedy, John F.; Nie, Jun

doi:10.1016/j.carbpol.2010.11.013

Cited by 19 publications

(5 citation statements)

References 29 publications

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“…Figure d displays the XRD diffractograms of the hydrogels before and after cross-linking. The strongest reflection appeared at 2θ ∼ 11.0 and 20.4° of CS are assigned to crystal forms I and crystal forms II, respectively. After covalent cross-linking, the peaks of CS–ECH at 2θ ∼ 11.4° and 2θ ∼ 20.8° become wider and weaker, which is due to the destruction of hydrogen bonding of CS during the cross-linking reaction .…”

Section: Resultsmentioning

confidence: 98%

Antifatigue Hydration-Induced Polysaccharide Hydrogel Actuators Inspired by Crab Joint Wrinkles

Yang

Shi

Deng

et al. 2022

ACS Appl. Mater. Interfaces

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Joint wrinkles in animals facilitate frequent bending and contribute to the duration of the joint. Inspired by the morphology and function of joint wrinkles, we developed a bionic hydration-induced polymeric actuator with constructed wrinkles at the selected area. Specifically, we adopt electrical writing to create defined single and double cross-linking regions on chitosan (CS) hydrogel. The covalent cross-linking network was constructed by electrical writing-induced covalent cross-linking between CS chains and epichlorohydrin. Subsequent treatment of sodium dodecyl sulfate allows electrostatic cross-linking at the unwritten area with the simultaneous formation of surface wrinkles. The resulting single and double cross-linking hydrogel demonstrates spontaneous deformation behaviors by the influx and efflux of H 2 O to the electrostatic cross-linking domain under different ion concentrations. Importantly, the wrinkle structure endows the hydrogel with extraordinary antifatigue bending performance. By regulating the surface morphology and spatial cross-linking, we can design novel biomimetic polysaccharide hydrogel actuators with fascinating functions.

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Section: Resultsmentioning

confidence: 98%

Antifatigue Hydration-Induced Polysaccharide Hydrogel Actuators Inspired by Crab Joint Wrinkles

Yang

Shi

Deng

et al. 2022

ACS Appl. Mater. Interfaces

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“…In the spectrum of the cellulose hydrogel, the bands at 1732, 1572, and 1406 cm −1 which were assigned to the CO stretching vibration of the ester group, asymmetric CO stretching vibration of the carboxylate in BTCA, and symmetric CO stretching vibration of the carboxylate in BTCA, respectively 20. In the case of the chitin hydrogel, the characteristic amide I band at 1660 cm −1 and the amide II band at 1550 cm −1 were observed 28. In the spectrum of the cellulose/chitin hybrid hydrogel prepared at the BTCA feed ratio of 1, the bands at 1732, 1660, 1572, 1550, and 1406 cm −1 were observed, indicating that the cellulose and chitin were crosslinked by esterification with BTCA.…”

Section: Resultsmentioning

confidence: 99%

Preparation, water absorbency, and enzyme degradability of novel chitin‐ and cellulose/chitin‐based superabsorbent hydrogels

Kono

Zakimi

2012

J of Applied Polymer Sci

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Superabsorbent hydrogels were prepared from chitin dissolved in lithium chloride and N-methyl-2-pyrrolidinone by esterification crosslinking with 1,2,3,4-butanetetracarboxylic dianhydride (BTCA). The absorbency of the chitin hydrogel was strongly dependent on the ratio of BTCA feed to chitin. The hydrogel prepared at the feed ratio of 5 showed the highest absorbency (345 g/g-polymer), and the hydrogel was composed of 0.65 molecules of BTCA per monomer unit of chitin. The hydrogels exhibited good biodegradability by chitinase with a maximum degradation of 91% within 7 days. This method for obtaining the chitin hydrogel was also applicable to cellulose and chitin mixtures, and 1 : 1 cellulose/chitin hybrid hydrogels could be obtained by the esterification crosslinking of a mixture with a 1 : 1 molar ratio of cellulose and chitin. The optimal BTCA feed ratio of 5 resulted in the cellulose/ chitin hydrogel with the highest water absorbency (329 g/g-polymer), and the hydrogel contained 0.65 molecules of BTCA per polysaccharide monomer unit. In addition, the hybrid hydrogels were degraded by cellulase as well as chitinase.

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“…Figure d displayed the XRD diffractogrames of CS and CS-ECH. The strongest reflection appeared at 2θ = 20.0° and 10.0° were assigned to crystal forms II and crystal forms I, respectively. After cross-linking, the peak at 2θ = 20.0° was weaker and became broader, and the peaks at 2θ = 10.0° disappeared which was due to the destruction of hydrogen bonding between amino groups and hydroxyl groups of chitosan during the cross-linking reaction …”

Section: Resultsmentioning

confidence: 99%

Electrical Writing Induced Covalent Cross-Linking on Hydrogel for Multidimensional Structural Information Storage

Yang

Shi

et al. 2021

ACS Appl. Mater. Interfaces

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The storage of dynamic information in hydrogel is extremely interesting due to the reprogrammable and responsive features of hydrogel. Here, we report that structural information can be stored in polysaccharide hydrogel by electrically induced covalent cross-linking, and the imbedded information can be retrieved by different means (dye adsorption, protonation of chitosan, and acid dissolution). Taking the advantage of diffusible feature of hydrogel, OH– was generated from the contacting area of the electrode and controllably diffused by electrical writing, thus the high pH domain (pH ∼ 10) triggered covalent cross-linking of the hydrogel. The written area exhibits different micromorphology, chemical properties, and pH sensitivity, allowing dynamic 2D and 3D information to be stored and read when necessary. This work demonstrates the use of stable electrical inputs to store dynamic structural information in a biopolymer-based hydrogel and how the chemical and physical varies allow eye recognition to the embedded information.

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Synthesize and properties of photosensitive organic solvent soluble acylated chitosan derivatives (2)

Cited by 19 publications

References 29 publications

Antifatigue Hydration-Induced Polysaccharide Hydrogel Actuators Inspired by Crab Joint Wrinkles

Antifatigue Hydration-Induced Polysaccharide Hydrogel Actuators Inspired by Crab Joint Wrinkles

Preparation, water absorbency, and enzyme degradability of novel chitin‐ and cellulose/chitin‐based superabsorbent hydrogels

Electrical Writing Induced Covalent Cross-Linking on Hydrogel for Multidimensional Structural Information Storage

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