Photoregulated Sol-Gel Transition of Novel Azobenzene-Functionalized Hydroxypropyl Methylcellulose and Its α-Cyclodextrin Complexes
✍ Scribed by Peijie Zheng; Xiao Hu; Xiongyan Zhao; Lin Li; Kam Chiu Tam; Leong Huat Gan
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 126 KB
- Volume
- 25
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
Summary: Novel azobenzene‐functionalized hydroxypropyl methylcellulose (AZO‐HPMC) polymers and their α‐cyclodextrin (α‐CD) complexes have been prepared. These polymers show interesting sol‐gel transition behavior in aqueous solutions. In the absence of α‐CD, the gelation temperature increases after UV irradiation, while in the presence of α‐CD, the gelation temperature decreases after UV irradiation. The difference in the gelation temperatures between the trans and cis samples of AZO‐HPMC opens a wide operating window for reversible regulation of the sol‐gel transition behavior by photoirradiation.
The UV‐induced cis/trans isomerism of azobenzene‐functionalized hydroxypropyl methylcellulose and its α‐cyclodextrin complexes.
imageThe UV‐induced cis/trans isomerism of azobenzene‐functionalized hydroxypropyl methylcellulose and its α‐cyclodextrin complexes.