作者:Lipeng Zhou、Jiaxi Li、Quan Luo、Junyan Zhu、Huixin Zou、Yuzhou Gao、Liang Wang、Jiayun Xu、Zeyuan Dong、Junqiu Liu
DOI:10.1039/c3sm27776c
日期:——
was successfully designed and synthesized. It can form physical pseudo-polyrotaxane (PPR) hydrogels in the presence of α-cyclodextrins (α-CDs). The branched structure of the THPP core promotes gel formation with a small amount of host and guest. Moreover, these resulting hydrogels are dual stimuli-responsive, which can be observed by physically macroscopical phenomena and 1H NMR spectra. Since BA can
成功设计并合成了以苯甲醛(BA)为末端修饰的四支分子THPP-(PEG 2000 -BA )4。在α-环糊精(α-CDs)存在下,它可以形成物理假聚轮烷(PPR)水凝胶。THPP核的分支结构促进了少量宿主和客体的凝胶形成。此外,这些生成的水凝胶具有双重刺激响应性,可以通过物理宏观现象和1 H NMR光谱进行观察。由于BA可以与胺反应形成具有动态共价特性的pH响应席夫碱,因此可以预期通过pH调节凝胶的形成。当THPP-(PEG 2000 -BA )4被较大分子6- N-乙二胺-6-脱氧官能化的β-CD(EDA-β-CD)阻止的凝胶化未发生。但是,添加酸会导致凝胶化,因为苯甲亚胺键可在酸性条件下水解,因此α-CD可以通过BA穿过聚乙二醇(PEG)链。当竞争激烈的客人时,是1- [对-(苯偶氮)苄基]-溴化物(Azo-C 1 -N +),加入到凝胶中,由于α-CD和PEG链之间的包合物的分解,观