Positioning a fluorescent probe at the core of a glassy star polymer for detection of local dynamics
文献类型：期刊论文
| 作者 | Li, Desheng1,2; Yang, Jingfa1,2; Zhao, Jiang1,2 |
| 刊名 | CHINESE CHEMICAL LETTERS
 |
| 出版日期 | 2018-03-01 |
| 卷号 | 29期号:3页码:374-380 |
| 关键词 | Perylene Diimide Star Polymer Glass Transition Fluorescence Defocus Imaging Local Dynamics |
| ISSN号 | 1001-8417 |
| DOI | 10.1016/j.cclet.2017.07.010 |
| 英文摘要 | Accessing local dynamics within a single macromolecule is the key to understand the physical origin of the viscoelasticity and especially the glass transition. In order to extract specific information on the dynamics of the branch point of a star polymer around its glass transition temperature, four-arm star poly (n-butyl methacrylate) with a fluorescent core was synthesized using perylene diimide as initiator and polymerization conducted via atom transfer radical polymerization. The process is found to be effective in positioning the fluorophore at the branch point with the fluorophore intact, which allows the successful application of single molecule fluorescence defocus imaging in examining the local site sensitive dynamics. The power spectra of rotation trajectories, the population of rotating fluorophores as well as the distribution of angular displacement were used to revel the difference in local dynamics between branch point and the arm's end. It is discovered that the local dynamics at the core of the star polymer is much less activated than that at the arm's end. The results demonstrate the strong effect dues to the topological constrain at the branch point and the more free space at the arm's end. (C) 2017 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved. |
| 语种 | 英语 |
| WOS记录号 | WOS:000429392800008 |
| 出版者 | ELSEVIER SCIENCE INC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/46027]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Zhao, Jiang |
| 作者单位 | 1.Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Desheng,Yang, Jingfa,Zhao, Jiang. Positioning a fluorescent probe at the core of a glassy star polymer for detection of local dynamics[J]. CHINESE CHEMICAL LETTERS,2018,29(3):374-380. |
| APA | Li, Desheng,Yang, Jingfa,&Zhao, Jiang.(2018).Positioning a fluorescent probe at the core of a glassy star polymer for detection of local dynamics.CHINESE CHEMICAL LETTERS,29(3),374-380. |
| MLA | Li, Desheng,et al."Positioning a fluorescent probe at the core of a glassy star polymer for detection of local dynamics".CHINESE CHEMICAL LETTERS 29.3(2018):374-380. |
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来源：化学研究所
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