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A method for analyzing the relaxation behavior of polymer segments in the glassy state

A polymer chain, glassy technology, applied in the basic research field of polymer physics, can solve problems such as lack of analytical methods, and achieve the effect of expanding the scope of research

Active Publication Date: 2018-07-20
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no effective analytical method for studying the dynamic behavior of polymer chain segments in the glassy state by single-molecule fluorescence

Method used

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  • A method for analyzing the relaxation behavior of polymer segments in the glassy state
  • A method for analyzing the relaxation behavior of polymer segments in the glassy state
  • A method for analyzing the relaxation behavior of polymer segments in the glassy state

Examples

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Embodiment 1

[0029] Embodiment 1, analyze the relaxation behavior of polyvinyl acetate (PVAc) segment

[0030] 1) Get polyvinyl acetate (the number-average molecular weight is 100,000g / mol, purchased from Aldrich company) and dissolve in ethyl acetate to prepare the ethyl acetate solution (1.7wt%) of PVAc, add different sizes of perylene respectively in the solution Fluorescent molecules (Probe-XS, Probe-S, Probe-M and Probe-L), obtained the ethyl acetate solution of PVAc added with perylene fluorescent molecules of different sizes, the concentration of fluorescent molecules in the control solution was about 10 -9 M. The mass ratio of fluorescent molecules to polymers is 5×10 -11 : 1; the structural formulas of perylene fluorescent molecules of different sizes are as follows:

[0031]

[0032] Adopt spin-coating method (spin-coating) above-mentioned solution to be coated on the glass sheet that handles clean (Thermo Fischer produces, thickness 0.17mm), spin-coating speed is 4000rpm, s...

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Abstract

The invention discloses a method for analyzing relaxation behaviors of a polymer chain section at a glassy state. The method comprises the following steps: (1) marking fluorescence molecules on a polymer at the glassy state or doping the fluorescence molecules into the polymer at the glassy state to prepare a polymer thin film sample, and carrying out annealing treatment; (2) observing the rotation of the fluorescence molecules in the polymer thin film sample, and photographing a defocusing video; (3) obtaining rotation tracks of the plurality of fluorescence molecules in the defocusing video; (4) carrying out rapid Fourier transform on the rotation tracks of the fluorescence molecules to obtain frequency distribution of a vibration mode in the rotation track of each fluorescence molecule, namely a frequency spectrum of each fluorescence molecule; and taking the average frequency spectrum of all the fluorescence molecules to analyze the relaxation behaviors of the polymer chain section at the glassy state. The method disclosed by the invention takes the advantages of a single-molecule fluorescence method, expands a research range and extends a cold state to the glassy state; and the relaxation behaviors of the chain section of a polymer system at the glassy state are effectively analyzed.

Description

technical field [0001] The invention belongs to the field of fundamental research of polymer physics, and specifically relates to a method for analyzing the relaxation behavior of polymer chain segments in a glass state. Background technique [0002] Glass transition has always been an unsolved problem in condensed matter physics, and the corresponding glass transition temperature is one of the most important characteristic temperatures of polymers. One of the most important features is the non-uniformity of the system, including spatial non-uniformity and temporal non-uniformity. Exploring the spatial and temporal scales of inhomogeneity is of great significance for understanding the glass transition. [0003] Single-molecule fluorescence microscopy is currently widely used to study glass transitions, which can avoid ensemble averaging to the greatest extent. By observing the rotation of the fluorescent molecules marked or doped in the system, the relaxation behavior of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
CPCG01N21/6458
Inventor 张昊杨京法赵江
Owner INST OF CHEM CHINESE ACAD OF SCI
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