頁籤選單縮合
題名 | Synthesis, Photochemical Properties, and Self-assembly of Diblock Copolymer Bearing Azobenzene Moieties |
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作者 | Yang, Po-chih; Li, Chung-yuan; Chen, Hsin-cheng; Juang, Ruey-shin; | 書刊名 | Journal of the Taiwan Institute of Chemical Engineers |
卷期 | 54 2015.09[民104.09] |
頁次 | 頁155-164 |
專輯 | Materials Science and Technology |
分類號 | 467.1 |
關鍵詞 | Diblock polymers; E/Z isomerization; Optical properties; Azobenzene; UV–vis spectroscopy; |
語文 | 英文(English) |
英文摘要 | This study describes the synthesis of an azobenzene-containing diblock copolymer, poly(StO50-b-Azo7), by using the macro-chain transfer agent StO macro-CTA, and employing sequential reverse addition-fragmentation transfer (RAFT) polymerization. We studied the effects of azobenzene (azo) unit on E/Z photoisomerization, the phase transition temperature, and self-assembly behavior of diblock copolymer, and evaluated the characteristic time involved in the decay process of the photoisomerization kinetics of diblock copolymer. Diblock copolymer poly(StO50-b-Azo7) exhibited moderate thermal stability, with thermal decomposition temperature of 5% weight loss at approximately 340.9 °C, suggesting that the enhancement of the thermal stability was attributed to the incorporation of azo segments into block copolymer. The diblock copolymer showed lower E–Z photoisomerization rates (T1 = 68.0 s) compared with azo monomer (T1 = 10.95 s). Gradually adding water to the tetrahydrofuran (THF) solution of poly(StO50-b-Azo7) produced spherical micelles. Spherical aggregates of poly(StO50-b-Azo7) were obtained (mean diameter = approximately 181.4 nm) by diluting the polymer disperse in a mixture of THF/H2O (water content = 10 vol%), and are shown in TEM images of the diblock copolymer. The results of this study contribute to research on the development of photoresponsive polymer materials. |
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