文献类型： 外文期刊
作者： Yu, Z. Y. 1 ; Li, Y. 1 ; Feng, Z. P. 1 ; Zhang, Z. H. 2 ; Li, P. 1 ; Chen, Y. 1 ; Chen, S. S. 1 ; Li, P. W. 3 ; Yang, Z. M. 3 ;
作者机构： 1.Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
2.Beijing Haidian Foreign Language Shi Yan Sch, Beijing 100195, Peoples R China
3.Chinese Acad Trop Agr Sci, Agr Prod Proc Res Inst, Zhanjiang 524001, Peoples R China
关键词： polymer gels; ammonia fumigation; Cu+; reduction; shape memory
期刊名称：EXPRESS POLYMER LETTERS （ 影响因子：4.161； 五年影响因子：3.995 ）
ISSN： 1788-618X
年卷期： 2019 年 13 卷 9 期
页码：
收录情况： SCI
摘要： Physically crosslinked chitosan hydrogels have better biocompatibility and possess unique functional characteristics but suffer from poor mechanical properties. In the current study, we prepared Cu+ -containing physically crosslinked chitosan hydrogels by exploiting ammonia fumigation and reduction of Cu2+ by NaHSO3. The content of Cu. in the prepared hydrogels was in a low range of 4.88-29.27 mu mol/g. The mechanical strength of the CTS-Cu+/NH3 hydrogels was remarkably improved up to 0.25 MPa and the elongation at break increased with rising content of Cu+ due to the dynamic crosslinks between chitosan and Cu+. Moreover, the CTS-Cu+/NH3 hydrogels demonstrated evident shape memory after exposure to air by exploiting the different coordination number of Cu2+ and Cu+. Thus, the prepared hydrogels may have good potential applications as biomedical materials.
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