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Detection of site-dependent segmental mobility of polymer by fluorescent defocused imaging

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Abstract

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.

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Acknowledgments

Experimental help in Secondary Ion Mass Spectroscopy by Prof. Fuyi Wang and Prof. Kui Wu is appreciated.

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Authors and Affiliations

  1. Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China

    De-sheng Li, Jing-fa Yang & Jiang Zhao  (赵江)

  2. The University of Chinese Academy of Sciences, Beijing, 100049, China

    De-sheng Li, Jing-fa Yang & Jiang Zhao  (赵江)

Authors
  1. De-sheng Li
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  2. Jing-fa Yang
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  3. Jiang Zhao  (赵江)
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Corresponding author

Correspondence to Jiang Zhao  (赵江).

Additional information

This work was financially supported by National Basic Research Program of China (No. 2014CB643601).

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Li, Ds., Yang, Jf. & Zhao, J. Detection of site-dependent segmental mobility of polymer by fluorescent defocused imaging. Chin J Polym Sci 35, 1488–1496 (2017). https://doi.org/10.1007/s10118-017-1976-8

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  • DOI: https://doi.org/10.1007/s10118-017-1976-8

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