Light-triggered reversible solubility of α-cyclodextrin and azobenzene moiety complexes in PDMAA-co-PAPA via molecular recognition

被引：43

作者：

Luo, Chunhua ^{[1
,2
]}

Zuo, Fang ^{[1
,2
]}

Ding, Xiaobin ^{[1
]}

Zheng, Zhaohui ^{[1
]}

Cheng, Xu ^{[1
]}

Peng, Yuxing ^{[1
]}

机构：

[1] Chinese Acad Sci, Chengdu Inst Organ Chem, Chengdu 610041, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100081, Peoples R China

来源：

JOURNAL OF APPLIED POLYMER SCIENCE | 2008年 / 107卷 / 04期

关键词：

azo polymers; molecular recognition; stimulisensitive; polymers; solubility;

D O I：

10.1002/app.27364

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Photoresponsive polymer with azobenzene pendant group (PDMAA-co-PAPA) was synthesized by radical polymerization of NN-dimethylacrylamide (DMAA) and N-4-phenylazophenyl acrylamide (PAPA), and the characterization of the inclusion complexes of the PDMAA-co-PAPA with alpha-cyclodextrin (alpha-CD) were performed by FTIR, GPC, H-1 NMR, 2D NOESY, and UV-vis spectroscopy. It was found that the solubility of PDMAA-co-PAPA and alpha-CD inclusion complexes in aqueous solution showed tunable property, which could be triggered by alternating UV-vis light irradiation at a certain temperature due to the effect of molecular recognition of alpha-CD with azobenzene moiety in the polymer. After UV irradiation, the lower critical solution temperature (LCST) of the polymer aqueous solution increased slightly without (alpha-CD while the LCST decreased sharply at presence of alpha-CD. Furthermore, UV spectroscopy showed that the photoisomerization of the polymer solution went on rapidly and reversibly, and 2D NOESY data suggested that the inclusion complexation of alpha-CD with trans azobenzene moiety and the decomplexation with cis azobenzene resulted in reversible solubility behavior when objected to UV and Vis light irradiation alternately. (c) 2007 Wiley Periodicals, Inc.

引用

页码：2118 / 2125

页数：8

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