Cu+-containing physically crosslinked chitosan hydrogels with shape memory

文献类型： 外文期刊

第一作者： Yu, Z. Y.

作者： Yu, Z. Y.;Li, Y.;Feng, Z. P.;Li, P.;Chen, Y.;Chen, S. S.;Zhang, Z. H.;Li, P. W.;Yang, Z. M.

作者机构：

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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