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A method for measuring carbon-centered free radicals

A method of determination and technology of free radicals, applied in the preparation of test samples, measurement of color/spectral characteristics, etc., can solve the problems of high reactivity, short life, low concentration, etc., achieve high sensitivity, simple equipment, and low detection cost low effect

Active Publication Date: 2016-03-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Carbon-centered radicals have the characteristics of high reactivity, short lifetime, and low concentration. They are the most common type of free radicals in polymer polymerization. At present, there are few researches on the detection of carbon-centered radicals.

Method used

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  • A method for measuring carbon-centered free radicals
  • A method for measuring carbon-centered free radicals
  • A method for measuring carbon-centered free radicals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Preparation of the solution to be tested

[0058] Using hydrochloric acid-sodium citrate buffer solution with pH=4 as solvent, prepare potassium nitrosodisulfate solution I with a concentration of 7 mmol / L.

[0059] Using the above buffer solution as a solvent, prepare azobisisobutylamidine hydrochloride initiator solution II with a concentration of 42 mmol / L.

[0060] Using the above buffer solution as a solvent, prepare potassium nitrosodisulfate and initiator mixed solution III, wherein the concentration of potassium nitrosodisulfate is the same as that in solution I, and the concentration of initiator is the same as that in solution II.

[0061] Potassium nitrosodisulfate solution Ⅰ is used to determine the parameters in the fitting formula 1; potassium nitrosodisulfate and initiator mixed solution Ⅲ is used to measure and calculate the concentration of carbon center free radicals and the accumulated carbon center in the system at a certain moment free radical ...

Embodiment 2

[0071] (1) Preparation of the solution to be tested

[0072] Na at pH=7.1 2 HPO 4 -K 2 HPO 4 The buffer solution is used as the solvent, and the sodium nitrosodisulfate solution I with a concentration of 0.05mmol / L is prepared.

[0073] Using the above buffer solution as a solvent, prepare azobisisobutylimidazoline hydrochloride initiator solution II with a concentration of 0.1 mmol / L.

[0074] Using the above buffer solution as a solvent, prepare the mixed solution III of sodium nitrosodisulfate and initiator, wherein the concentration of sodium nitrosodisulfate is the same as that in solution I, and the concentration of initiator is the same as that in solution II.

[0075] Sodium nitrosodisulfate solution Ⅰ is used to determine the parameters in the fitting formula 1; sodium nitrosodisulfate and initiator mixed solution Ⅲ is used to measure and calculate the carbon center free radical concentration and the accumulated carbon center free radical concentration in the syst...

Embodiment 3

[0085] (1) Preparation of the solution to be tested

[0086] Na at pH=12 2 HPO 4 -NaOH buffer solution is used as solvent, and ammonium nitrosodisulfate solution I with a concentration of 20mmol / L is prepared.

[0087] Using the above buffer solution as a solvent, prepare azobiscyanovaleric acid initiator solution II with a concentration of 100 mmol / L.

[0088] Using the above buffer solution as a solvent, prepare a certain concentration of ammonium nitrosodisulfate and initiator mixed solution III, wherein the concentration of ammonium nitrosodisulfate is the same as that in I, and the concentration of the initiator is the same as in II.

[0089] Ammonium nitrosodisulfate solution I is used to determine the parameters in the fitting formula 1; ammonium nitrosodisulfate and initiator mixed solution III is used to measure and calculate the concentration of free radicals in the system at a certain moment and the cumulative concentration of free radicals.

[0090] (2) Test ste...

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Abstract

The invention discloses a determination method of carbon center free radicals. According to the determination method, the carbon center free radicals react with nitroso disulfate in an aqueous solution so that the nitroso disulfate water solution is faded, visible light with the wavelength of 543nm is selectively absorbed by the nitroso disulfate water solution simultaneously, change of absorbancy of the solution along with time is determined, and then the data processing method provided by the invention is utilized to obtain carbon center free radical concentration and accumulated carbon center free radical concentration of the water solution at any time. By utilizing the determination method, various types of carbon center free radicals can be determined. The determination method is simple in instruments, low in determination cost, simple and convenient to operate and high in sensitivity. The carbon center free radical concentration which can be determined by the determination method can be reduced to the magnitude of 10-15mol / L.

Description

technical field [0001] The invention relates to the field of free radical measurement, in particular to a method for measuring carbon-centered free radicals. Background technique [0002] Free radicals (freeradicals, FRs) have strong chemical reactivity, and they will react with certain substances in a very short time or undergo double-radical termination reactions between free radicals, and their traces are difficult to capture. At present, the methods reported at home and abroad for the determination of free radicals mainly include: electron spin resonance (ESR), spectrophotometry, chemiluminescence, fluorescence and high performance liquid chromatography. [0003] The ESR method uses the magnetic resonance characteristics of the unpaired electrons of free radicals to detect free radicals, but because the concentration of free radicals is usually low, it cannot reach the detection level of the current ESR technology (10 -6 ~10 -7 mol / L), the additional use of free radica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N1/38
Inventor 单国荣尚玥潘鹏举
Owner ZHEJIANG UNIV
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