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Effect of α-Cyclodextrin on the Photoisomerization of Azobenzene Functionalized Hydroxypropyl Methylcellulose in Aqueous Solution

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Summary

The effect of α-cyclodextrin (α-CD) on the trans-cis photoisomerization of an azobenzene functionalized polymer (AZO-HPMC) in aqueous solutions has been systematically studied. It has been shown that the cis fraction at the photostationary states and the photoisomerization rate constant increases with increasing α-CD concentration, indicating that the trans-cis photoisomerization of AZO-HPMC is accelerated by addition of α-CD. This behavior is interpreted in terms of the aggregation between the azobenzene groups. The formation of inclusion complexes between the trans isomers and α-CD inhibits the aggregation and consequently increases the mobility and free volume for the isomerization.

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Authors and Affiliations

  1. The 13th Research Institute of China Electronics Technology Group Corporation, 113 Hezuo Road, 050051, Shijiazhuang, P.R. China

    Weiyan Wang & Ming-Zhu Wang

  2. Hebei University of Science and Technology, 050018, Shijiazhuang, P.R. China

    Weiyan Wang & Ming-Zhu Wang

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  1. Weiyan Wang
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  2. Ming-Zhu Wang
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Correspondence to Ming-Zhu Wang.

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Wang, W., Wang, MZ. Effect of α-Cyclodextrin on the Photoisomerization of Azobenzene Functionalized Hydroxypropyl Methylcellulose in Aqueous Solution. Polym. Bull. 59, 537–544 (2007). https://doi.org/10.1007/s00289-007-0789-2

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  • DOI: https://doi.org/10.1007/s00289-007-0789-2

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