Formation of Supramolecular Hydrogel via Host-Guest Recognition of Hydrophobically Modified Polyacrylamide and α-Cyclodextrin Polymer

Shu-jing LI; Hai-yan LIANG; Wei ZHOU

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Formation of Supramolecular Hydrogel via Host-Guest Recognition of Hydrophobically Modified Polyacrylamide and α-Cyclodextrin Polymer

更新时间：2022-09-18

- Formation of Supramolecular Hydrogel via Host-Guest Recognition of Hydrophobically Modified Polyacrylamide and α-Cyclodextrin Polymer
- Polymer Bulletin Vol. 26, Issue 8, Pages: 61-67(2013)
- 作者机构：
  
  北京工商大学理学院化学系，北京　100048
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2013-08，
  
  Received：14 April 2013，
  
  Revised：22 May 2013，
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Shu-jing LI, Hai-yan LIANG, Wei ZHOU. Formation of Supramolecular Hydrogel via Host-Guest Recognition of Hydrophobically Modified Polyacrylamide and α-Cyclodextrin Polymer. [J]. Polymer Bulletin 26(8):61-67(2013)
DOI：

Shu-jing LI, Hai-yan LIANG, Wei ZHOU. Formation of Supramolecular Hydrogel via Host-Guest Recognition of Hydrophobically Modified Polyacrylamide and α-Cyclodextrin Polymer. [J]. Polymer Bulletin 26(8):61-67(2013) DOI：

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

H NMR、2D NOESY 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。

Abstract

A α-cyclodextrin (α-CD) modified poly(acrylic acid) (PAA-α-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

H 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-α-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.

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

Keywords

Cyclodextrin polymerHost-guest interactionSupramolecular hydrogelLight-responsiveAzobenzene

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