| Autor: |
Zhang, Yu, Yu, Tian Jiao, Zhang, Yan, Li, Yang |
| Zdroj: |
Advanced Materials Research; January 2014, Vol. 884 Issue: 1 p51-54, 4p |
| Abstrakt: |
This paper demonstrated the photochromic behavior of two novel spiropyran functionalized dendrigraft polybutadiene with linear-comb and star-comb architectures (LC-PB-Sp and SC-PB-Sp, respectively). LC-PB-Sp and SC-PB-Sp were synthesized via the combination of anionic polymerization and click chemistry methodology. The photochromic behavior was investigated based on UV-Vis spectroscopy. The results showed that the coloring speed was in an order of v (Sp) >v (SC-PB-Sp) >v (LC-PB-Sp), while the discoloration speed exhibited in an order of v (SC-PB-Sp) >v (LC-PB-Sp) >v (Sp), suggesting that the nonpolar dendritic PB matrices tended to stabilize the nonpolar closed form of spiropyran. Furthermore, the retrieval rate of SC-PB-Sp was much faster than its corresponding LC-PB-Sp due to its more compact structure. |
| Databáze: |
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