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    Single-molecule imaging reveals topological isomer-dependent diffusion by 4-armed star and dicyclic 8-shaped polymers

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    Habuchi_PolymChem_2015.pdf
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    Type
    Article
    Authors
    Habuchi, Satoshi cc
    Fujiwara, Susumu
    Yamamoto, Takuya
    Tezuka, Yasuyuki
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Bioscience Program
    Single-Molecule Spectroscopy and Microscopy Research Group
    Date
    2015
    Permanent link to this record
    http://hdl.handle.net/10754/556249
    
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    Abstract
    Diffusion dynamics of topological isomers of polymer molecules was investigated at the single-molecule level in a melt state by employing the fluorophore-incorporated 4-armed star and the corresponding doubly-cyclized, 8-shaped poly(THF) chains. While the single-molecule fluorescence imaging experiment revealed that the diffusion of the 4-armed star polymer was described by a single Gaussian distribution, the diffusion of the 8-shaped polymer exhibited a double Gaussian distribution behaviour. We reasoned that the two 8-shaped polymeric isomers have distinct diffusion modes in the melt state, although ensemble-averaged experimental methods cannot detect differences in overall conformational state of the isomers. The single-molecule experiments suggested that one of the 8-shaped polymeric isomer, having the horizontally oriented form, causes an efficient threading with the linear matrix chains which leads to the slower diffusion compared with the corresponding 4-armed star polymer, while the other 8-shaped polymeric isomer, having the vertically oriented form, displayed faster diffusion by the suppression of effective threading with the linear matrix chains due to its contracted chain conformation.
    Citation
    Single-molecule imaging reveals topological isomer-dependent diffusion by 4-armed star and dicyclic 8-shaped polymers 2015 Polym. Chem.
    Publisher
    Royal Society of Chemistry (RSC)
    Journal
    Polym. Chem.
    DOI
    10.1039/C5PY00534E
    Additional Links
    http://pubs.rsc.org/en/Content/ArticleLanding/2015/PY/C5PY00534E
    ae974a485f413a2113503eed53cd6c53
    10.1039/C5PY00534E
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Bioscience Program

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