摘要
制备了侧链含α-环糊精(α-CD)的聚丙烯酸(PAA-α-CD)作为主体聚合物,侧链含偶氮基团(Azo)的聚丙烯酰胺(PAM-Azo)作为客体聚合物。利用1 H NMR、2DNOESY NMR方法测定了PAA-α-CD与PAM-Azo间的主客体作用。结果表明,PAM-Azo侧链的trans-Azo基团能够被PAA-α-CD侧链的α-CD包结,而cis-Azo基团不能被α-CD包结。在一定浓度下,PAA-α-CD与PAM-Azo通过主客体间的识别能够形成超分子水凝胶,并且该凝胶具有光响应性。在365nm紫外光光照下,PAM-Azo侧链的trans-Azo转变为cis-Azo,不能被PAA-α-CD侧链的α-CD包结,超分子水凝胶转变为溶胶。而在430nm的可见光光照下,PAM-Azo侧链的cis-Azo转变为trans-Azo,重新被PAA-α-CD侧链的α-CD包结,又可得到超分子水凝胶。
A α-cyclodextrin (a-CD) modified poly(acrylic acid) (PAA-a-CD) acting as the host-polymer and an azobenzene-branched polyacrylamide (PAM-Azo) acting as the guest-polymer were prepared. The interaction of PAA-α-CD with PAM-Azo was characterized by 1H NMR and 2D NOESY NMR spectroscopy. The 2D NOESY NMR spectroscopy indicate that trans-azobenzene (trans-Azo) units are bounded strongly within the cavities of PAA-a-CD whereas the cis- azobenzene (cis-Azo) is not bound at all. A supramolecular inclusion complex, formed by PAA-α-CD and PAM-Azo, is accompanied by the formation of a light-responsive hydrogel. Upon photoirradiation with UV light of 365nm, the hydrogel is converted efficiently to the sol phase because the trans-Azo units are converted photochemically to their cis configuratons, where upon the resulting cis-Azo units dissociation from PAA-α-CD. The hydrogel can be recovered from the sol phase by photoirradiation with visible light of 430nm.
出处
《高分子通报》
CAS
CSCD
北大核心
2013年第8期61-67,共7页
Polymer Bulletin
基金
国家自然科学基金(批准号:NO.21003005)
教育部留学回国人员科研启动基金资助项目
北京市教委科技发展面上项目(KM201210011006)
北京工商大学青年教师科研启动基金
关键词
环糊精聚合物
主客体相互作用
超分子水凝胶
光响应
偶氮苯
Cyclodextrin polymer
Host-guest interaction
Supramolecular hydrogel
Light-responsive
Azobenzene