a.Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
b.Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Department of Engineering Mechanics, Zhejiang University, Hangzhou 310027, China
Zi-liang Wu (吴子良), E-mail:wuziliang@zju.edu.cn
收稿:2017-04-16,
修回:2017-5-16,
录用:2017-5-17,
纸质出版:2017-10-05
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Feng-bo Zhu, Hai-chao Yu, Wen-xi Lei, 等. Tough Polyion Complex Hydrogel Films of Natural Polysaccharides[J]. Chinese Journal of Polymer Science, 2017,35(10):1276-1285.
Feng-bo Zhu, Hai-chao Yu, Wen-xi Lei, et al. Tough Polyion Complex Hydrogel Films of Natural Polysaccharides[J]. Chinese Journal of Polymer Science, 2017, 35(10): 1276-1285.
Feng-bo Zhu, Hai-chao Yu, Wen-xi Lei, 等. Tough Polyion Complex Hydrogel Films of Natural Polysaccharides[J]. Chinese Journal of Polymer Science, 2017,35(10):1276-1285. DOI: 10.1007/s10118-017-1977-7.
Feng-bo Zhu, Hai-chao Yu, Wen-xi Lei, et al. Tough Polyion Complex Hydrogel Films of Natural Polysaccharides[J]. Chinese Journal of Polymer Science, 2017, 35(10): 1276-1285. DOI: 10.1007/s10118-017-1977-7.
The developments of tough hydrogels in recent years have greatly expanded the applications of hydrogels as structural materials. However
most of the tough hydrogels are made of synthetic polymers. To develop biopolymer-based tough hydrogels has both fundamental and practical significances. Here we report a series of polysaccharides-based tough hydrogel films prepared by polyion complexation and solvent evaporation of chondroitin sulfate (CS) and protonated chitosan (CHT) solutions with different weight ratios. The obtained CS/CHT gel films with thickness of 40-80 μm and water content of 66 wt%-81 wt% possess excellent mechanical properties
with tensile breaking stress and breaking strain being 0.4-3 MPa and 160%-320%
respectively. We found that in the mixture solutions there are large amounts of excess CHT in terms of charges; after swelling the films in water
the acetic acid
which is used to protonate the amino groups of CHT
diffuses out of the gel matrix
enhancing the intermolecular interactions between CHT molecules and thus improving the mechanical properties of gel films
besides the ionic bonds between CS and CHT. Antimicrobial tests also showed that the gel films with low weight ratio of CS to CHT
corresponding to the case with excess CHT
have evident antimicrobial effect. These CS/CHT gel films with good mechanical properties and antimicrobial effect should extend the applications of hydrogels in biomedical fields.
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