基于环糊精二聚体与金刚烷修饰的温敏性聚合物的主客体识别构筑超分子水凝胶

Supramolecular Hydrogels Obtained by Host-Guest Interactions of Cyclodextrin Dimers with Adamantyl-Containing LCST Copolymers

利用环糊精二聚体(trans-Stilbeneβ-CD Dimer)与金刚烷修饰的温敏性聚合物(Pnipam-Ad)的主客体识别作用构筑了超分子水凝胶.2D NMR测定结果表明trans-Stilbeneβ-CD Dimer和Pnipam-Ad的主客体相互作用是通过β-CD空腔和疏水体Ad形成包结络合物进行的.环糊精二聚体trans-Stilbeneβ-CD Dimer和聚合物Pnipam-Ad两者之间的缔合程度受trans-Stilbeneβ-CD Dimer和Pnipam-Ad的浓度以及trans-Stilbeneβ-CD Dimer光异构的影响.此外,由于trans-Stilbeneβ-CD Dimer对Pnipam-Ad聚合物链的物理交联作用使两者混合溶液的最低临界溶解温度(LCST)低于纯聚异丙基丙烯酰胺(Pnipam)的LCST.

Supramolecular hydrogels were constructed by the formation of inclusion complexes between trans-Stilbene β-CD Dimer and adamantyl modified poly（N-isopropylacrylamide）（Pnipam-Ad）.The results of 2D NMR measurement indicated that the host-guest interaction between trans-Stilbene β-CD Dimer and Pnipam-Ad was carried out through the formation of inclusion complexes between β-CD cavity and the hydrophobe Ad.The interaction between trans-Stilbene β-CD Dimer and Pnipam-Ad was depended on the concentration of trans-Stilbene β-CD Dimer,Pnipam-Ad and the photoisomerization of trans-Stilbene β-CD Dimer.In addition,the lower critical solution temperature（LCST） of the supramolecular networks consisting of trans-Stilbene β-CD Dimer and Pnipam-Ad are significantly lower than those of pure Pnipam.