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Determination method for degree of grafting of fluorine-containing graft polymer

A graft polymer and a measuring method technology, applied in the field of graft rate determination, can solve problems such as high accuracy

Inactive Publication Date: 2013-11-06
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the problem of low accuracy brought about by the weighing method when measuring the grafting rate of a large area or a powder sample, and to provide a method with simple operation and low sample consumption. , the determination method of the grafting rate of the fluorine-containing graft polymer with accurate results, and the test method provided by the present invention can obtain the distribution of the grafting rate of the larger-area grafted sample after multiple measurements at different positions Uniformity

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  • Determination method for degree of grafting of fluorine-containing graft polymer
  • Determination method for degree of grafting of fluorine-containing graft polymer
  • Determination method for degree of grafting of fluorine-containing graft polymer

Examples

Experimental program
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Effect test

Embodiment 1

[0117] Example 1 Preparation of the total ionic strength adjustment buffer solution when the fluorine-containing graft polymer is a fluorine-containing polymer grafted with a non-fluorine-containing vinyl monomer, and the acquisition of a standard curve

[0118] Weigh 58 grams of sodium chloride, 10 grams of sodium citrate, measure 50 mL of glacial acetic acid, add them together to 500 mL of deionized water, stir until dissolved, slowly add 6 mol / L sodium hydroxide solution under stirring, until the pH value of the solution reaches 5.0 ~7.0 range, with a pH value of about 5.5 being the best, cool to room temperature, and set the volume to 1000mL to prepare the total ionic strength adjustment buffer solution. Each sample needs to use 100mL of total ionic strength adjustment buffer solution for absorption determination.

[0119] Use sodium fluoride as the solute and the above-mentioned total ionic strength adjustment buffer solution as the solvent to prepare a series of standard...

Embodiment 2

[0125] Cut the ashless filter paper, accurately weigh 10.0mg of polyvinylidene fluoride grafted styrene modified sample by differential method, fold and fix it on the helix at the lower end of the platinum wire; pour 35mL total ionic strength adjustment buffer solution into the combustion bottle , and then pass oxygen into the combustion bottle for 1 minute. Ignite the sample filter paper bag and put it into the combustion flask quickly and liquid-seal the bottle mouth with 2mL of the total ionic strength adjustment buffer solution prepared in Example 1. After the combustion is complete (there should be no black fragments left in the combustion flask), shake fully to make The generated smoke is completely inhaled into the absorption solution, and the solution is left for 15 minutes to ensure that the HF gas generated after combustion is fully absorbed by the buffer solution, then rinse the cork and platinum wire with the remaining total ionic strength adjustment buffer solution...

Embodiment 3

[0129] Example 3 The preparation of the total ionic strength adjustment buffer solution and the acquisition of the standard curve when the fluorine-containing graft polymer is a non-fluorine-containing polymer grafted with a fluorine-containing vinyl monomer

[0130] Weigh 58 grams of sodium chloride, 10 grams of sodium citrate, measure 50 mL of glacial acetic acid, add them together to 500 mL of deionized water, stir until dissolved, slowly add 6 mol / L sodium hydroxide solution under stirring, until the pH value of the solution reaches 5.0 ~7.0 range, with a pH value of about 5.5 being the best, cool to room temperature, and set the volume to 1000mL to prepare the total ionic strength adjustment buffer solution. Each sample needs to use 100mL of total ionic strength adjustment buffer solution for absorption determination.

[0131] Use sodium fluoride as the solute and the above-mentioned total ionic strength adjustment buffer solution as the solvent to prepare a standard seri...

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Abstract

The invention discloses a determination method for the degree of grafting of a fluorine-containing graft polymer, which is characterized in that when the fluorine-containing graft polymer is a fluorine-containing polymer grafted by a non-fluorine-containing vinyl monomer, the fluorine-containing graft polymer and a sample which is the same as the ungrafted fluorine-containing polymer are respectively treated with an oxygen flask combustion method, then total ionic strength adjustment buffer solutions of which the volumes are v1 and v0 are respectively adopted to carry out absorption, the molar concentrations c1 and c0 of the fluoride ions of the obtained solutions are respectively determined with a fluorine ion selective electrode method, and then v1, v0, c1 and c0 are substituted into a formula to work out the degree of grafting (DG); and when the fluorine-containing graft polymer is a non-fluorine-containing polymer grafted by a fluorine-containing vinyl monomer, the fluorine-containing graft polymer is treated with the oxygen flask combustion method, then the total ionic strength adjustment buffer solution of which the volume is v1 is utilized to carry out the absorption, the molar concentration c1 of the fluorine ions of the obtained solution is determined by using the fluorine ion selective electrode method; and v1 and c1 are substituted into the formula to work out the degree of grafting (DG).

Description

technical field [0001] The invention specifically relates to a method for measuring the grafting rate of a fluorine-containing graft polymer. Background technique [0002] For the finished polymer film, the method used to determine the grafting rate of the grafting reaction is mainly the weighing method, that is, the grafting rate DG (Degree of grafting) is: [0003] DG = W g - W 0 W 0 × 100 % ......① [0004] where W 0 , W g are the weights of the samples before and after the grafting reaction, respectively. For uniformly grafted film samples, the weighing method is a more accurate method. However, when the sample area is too large and it is difficult to weigh, or when the grafting rate of the sample is not uniform due to the influence ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/413G01N1/28
Inventor 李景烨邓波李林繁谢雷东虞鸣于洋张伯武杨璇璇
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI