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Measuring method for diffusion motion trail of single molecular chain in thin polymer film

A technology of polymer film and measurement method, applied in material excitation analysis, fluorescence/phosphorescence, etc., can solve problems such as inability to obtain single-chain information, and achieve the effect of high signal-to-noise ratio and sensitivity

Inactive Publication Date: 2011-09-14
INST OF CHEM CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

[0003] Traditional measurement methods can only obtain the macroscopic properties of polymers, but cannot obtain the information of single chains

Method used

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  • Measuring method for diffusion motion trail of single molecular chain in thin polymer film
  • Measuring method for diffusion motion trail of single molecular chain in thin polymer film
  • Measuring method for diffusion motion trail of single molecular chain in thin polymer film

Examples

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Effect test

Embodiment 1

[0028] Embodiment 1, the mensuration of unimolecular chain diffusion trajectory in polyethylene glycol molten state film

[0029] 1. Preparation of fluorescently labeled polyethylene glycol

[0030] One of the terminals of polyethylene glycol is a hydroxyl group, and the rhodamine 6G molecule contains an ester group. 20mg polyethylene glycol (the number average molecular weight is 5000g / mol, purchased from Polymer Source company) and 3mg rhodamine 6G (its maximum absorption wavelength 532nm) was dissolved in thionyl chloride, refluxed at 120°C for 2 days, and the hydroxyl group at one end of polyethylene glycol and the ester group of rhodamine 6G underwent transesterification, so that rhodamine 6G was labeled at the end of the polyethylene glycol chain The obtained reaction solution is passed through a volume exclusion gel column, the rhodamine 6G-labeled polyethylene glycol flows out of the chromatogram first, and the unreacted free rhodamine 6G molecule flows out of the chro...

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Abstract

The invention provides a measuring method for the diffusion motion trail of a single molecular chain in a thin polymer film, which comprises the following steps: 1) connecting fluorescence probe molecules to the long chain tail end of the polymer to be measured to obtain a fluorescence labeling polymer; 2) blending the fluorescence labeling polymer into the unlabelled polymer to be measured and preparing a thin polymer film sample; 3) irradiating continuous laser to the sample to obtain the fluorescence which is emitted by the fluorescence labeling polymer; and 4) focusing and imaging the fluorescence to obtain the continuous single molecular images of the fluorescence labeling polymer and connecting the continuous single molecular images of the fluorescence labeling polymer along with different time to obtain the diffusion motion trail of the single molecular chain in the thin polymer film. The measuring method provided by the invention utilizes a single molecular fluorescence imaging technique and has the sensitivity at the single molecular level.

Description

technical field [0001] The invention relates to a method for measuring the diffusion trajectory of a polymer single molecular chain, in particular to a method for measuring the diffusion trajectory of a single molecular chain in a polymer film. Background technique [0002] Polymer materials are materials composed of many long chains, and the properties of polymer chains directly affect the performance of materials. The usual polymer measurement methods can only measure the overall properties of the material macroscopically, and cannot obtain the properties of single molecules from the microscopic level. The macroscopic properties of polymers are the average information exhibited by all polymer chains, such as glass transition, melting, crystallization, rheological properties, etc. These information are of great significance for improving the performance of materials. However, it is the behavior of each molecular chain in the polymer material that essentially determines the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 陈锐赵江
Owner INST OF CHEM CHINESE ACAD OF SCI
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