Citation: De-sheng Li, Jing-fa Yang, Jiang Zhao. Detection of Site-dependent Segmental Mobility of Polymer by Fluorescent Defocused Imaging[J]. Chinese Journal of Polymer Science, ;2017, 35(12): 1488-1496. doi: 10.1007/s10118-017-1976-8 shu

Detection of Site-dependent Segmental Mobility of Polymer by Fluorescent Defocused Imaging

De-sheng Li ^a,b ,
Jing-fa Yang ^a,b ,
Jiang Zhao ^a,b,,

a.
Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
b.
The University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: Jiang Zhao, jzhao@iccas.ac.cn
Received Date: 8 April 2017
Revised Date: 9 May 2017
Accepted Date: 10 May 2017

Fund Project: National Basic Research Program of China 2014CB643601

Polymer chain ends play an important role in the glassy dynamics of polymeric materials. In this study, a combination of single molecule defocus fluorescence microscopy and well-controlled atom transfer radical polymerization was used to investigate site-dependent segmental mobility of poly(n-butyl methacrylate). As the temperature increased, the rotation of fluorophores, which were selectively labelled in chain end and chain middle, was gradually activated. The power spectra of rotation trajectories, the distribution of angular displacement as well as the population of rotating fluorophores demonstrated that the local dynamics was more activated at the chain ends than the middles, showing the unique contribution of the chain end to the dynamics of the system.
- Glass transition,
- Segmental mobility,
- Chain end effect,
- Fluorescent defocused imaging
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