Monitoring Nanoscale Deformations in a Drawn Polymer Melt with Single-Molecule Fluorescence Polarization Microscopy.
Monitoring Nanoscale Deformations in a Drawn Polymer Melt with Single-Molecule Fluorescence Polarization Microscopy.
复制标题
使用单分子荧光偏振显微镜监测拉伸聚合物熔体中的纳米级变形
DOI:
10.1021/acsnano.5b05729
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发表时间:
1917
期刊:
影响因子:
17.1
通讯作者:
C. von Borczyskowski
中科院分区:
文献类型:
--
作者:
S. Krause;M. Neumann;M. Fröbe;R. Magerle;C. von Borczyskowski
Elongating a polymer melt causes polymer segments to align and polymer coils to deform along the drawing direction. Despite the importance of this molecular response for understanding the viscoelastic properties and relaxation behavior of polymeric materials, studies on the single-molecule level are rare and were not performed in real time. Here we use single-molecule fluorescence polarization microscopy for monitoring the position and orientation of single fluorescent perylene diimide molecules embedded in a free-standing thin film of a polymethyl acrylate (PMA) melt with a time resolution of 500 ms during the film drawing and the subsequent stress relaxation period. The orientation distribution of the perylene diimide molecules is quantitatively described with a model of rod-like objects embedded in a uniaxially elongated matrix. The orientation of the fluorescent probe molecules is directly coupled to the local deformation of the PMA melt, which we derive from the distances between individual dye molecules. In turn, the fluorescence polarization monitors the shape deformation of the polymer coils on a length scale of 5 nm. During stress relaxation, the coil shape relaxes four times more slowly than the mechanical stress. This shows that stress relaxation involves processes on length scales smaller than a polymer coil. Our work demonstrates how optical spectroscopy and microscopy can be used to study the coupling of individual fluorescent probe molecules to their embedding polymeric matrix and to an external mechanical stimulus on the single-molecule level.
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DOI:
--
发表时间:
2011
期刊:
Physical Chemistry, Chemical Physics - PCCP
影响因子:
--
作者:
G. Hinze;T. Basché;R. Vallée
通讯作者:
R. Vallée
影响因子:
4.4
作者:
R. Vallée;N. Tomczak;G. Vancso;L. Kuipers;N. V. Hulst
通讯作者:
N. V. Hulst
影响因子:
--
作者:
D. Wöll;H. Uji‐i;T. Schnitzler;J. Hotta;P. Dedecker;A. Herrmann;F. D. De Schryver;K. Müllen;J. Hofkens
通讯作者:
J. Hofkens
影响因子:
17.1
作者:
J. T. King;Changqiang Yu;W. Wilson;S. Granick
通讯作者:
S. Granick
DOI:
--
发表时间:
1993
期刊:
影响因子:
--
作者:
L. Fleury;A. Zumbusch;M. Orrit;Ross Brown;J. Bernard
通讯作者:
J. Bernard