Method for Determination of Molecular Weight Distribution Curve of Hydrophobically Associating Polymers

A technology of molecular weight distribution and hydrophobic association, which is applied in the field of determination of molecular weight distribution curve of hydrophobic association polymers, can solve the problems that molecular weight distribution is not involved, and the molecular weight distribution of hydrophobic association polymers cannot be measured.

Inactive Publication Date: 2018-08-07
SOUTHWEST PETROLEUM UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These studies show that microporous membrane experiments can classify polymers to a certain extent, but they do not involve the study of molecular weight distribution, and lack of calculation and fitting methods for the cumulative percentage of each fraction, so it is impossible to realize the classification of hydrophobic associations. Determination of Molecular Weight Distribution of Synthetic Polymers

Method used

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  • Method for Determination of Molecular Weight Distribution Curve of Hydrophobically Associating Polymers
  • Method for Determination of Molecular Weight Distribution Curve of Hydrophobically Associating Polymers
  • Method for Determination of Molecular Weight Distribution Curve of Hydrophobically Associating Polymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: the selection of solvent

[0047] (1) Intrinsic viscosity test

[0048] Choose 1,3 propylene glycol and NaCl mixed solvent, such as figure 1 As shown, when the NaCl concentration is 0.1mol / L, with the increase of the volume fraction of 1,3-propanediol, the intrinsic viscosity of the 1000mg / L polymer solution (HAWSP-3) first decreases and then tends to be stable. When the volume concentration of propylene glycol is 40%, the intrinsic viscosity is stable, and the association of the polymer solution has been destroyed at this time. figure 2 As shown, when the concentration of 1,3-propanediol is 50%, when the concentration of NaCl is 0.2mol / L, the intrinsic viscosity is stable, and when there is no association in HAWSP-3 solution, a small amount of salt can make the extended The molecular chain shrinks completely, eliminating the polyelectrolyte effect. Therefore, when the volume fraction of 1,3-propylene glycol in the mixed solvent is 50% and the concentr...

Embodiment 2

[0056] Embodiment 2: Determination of the cumulative percentage content of each fraction of hydrophobically associated polymer

[0057] Specific steps are as follows:

[0058] 1) The standard curve of hydrophobic association polymer absorbance-concentration: the preparation concentration is respectively the hydrophobic association polymer (HAWSP-3) solution of 200mg / L, 400mg / L, 600mg / L, 800mg / L, 1000mg / L, Among them, the volume fraction of 1,3-propanediol is 50%, and the concentration of NaCl is 0.2mol / L. Measure absorbance with UV-2601 type spectrophotometer when wavelength 220nm (1cm cuvette), obtain the standard curve equation A=0.0009c+0.0217 of hydrophobic association polymer concentration-absorbance, see image 3 .

[0059] 2) Prepare a hydrophobic association polymer target solution with a concentration of 1000 mg / L, in which the volume fraction of 1,3-propanediol is 50%, and the concentration of NaCl is 0.2 mol / L, stir with a magnetic stirrer for 4 hours, and after s...

Embodiment 3

[0069] Example 3: Molecular Weight Determination of Fractions of Hydrophobically Associating Polymers

[0070] Calibrate the Mark-Houwink equation of hydrophobic association polymers: select the standard samples of hydrophobic association polymers (HAWSP-1, HAWSP-2), measure their molecular weight in the mixed solvent by static light scattering, and then measure the mixture of these two polymers. Intrinsic viscosity value in solvent, the test results are shown in Table 4:

[0071] Table 4: Molecular Characteristic Parameters of Standard Samples

[0072] sample

Molecular weight g / mol

Intrinsic viscosity [η] / (mL·g -1 )

HAWSP-1

3.49×10 6

1243

HAWSP-2

2.60×10 6

1046

[0073] Calibrate the Mark-Houwink equation [η]=KM of the hydrophobic association polymer under this solvent condition α For [η] = 0.182M 0.586 .

[0074] Determination of the intrinsic viscosity of each fraction of the hydrophobic association polymer (HAWSP-3), ...

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Abstract

The invention provides a method for determining the molecular weight distribution curve of a hydrophobically associative polymer: firstly, under suitable solvent conditions, the hydrophobic association in a solution of the hydrophobically associative polymer is eliminated, the polyelectrolyte effect is shielded, and the macromolecules are dissolved in a dilute solution. Then, using the principle of membrane pore size separation, microporous membranes with different pore sizes were selected, and the hydrophobically associative polymers were classified by the microporous membrane flow experimental device to separate polymers with different molecular weights. Use quadratic equation to fit the relationship between filtrate mass and filtration time to obtain the mass of each fraction of polymer solution, measure the concentration of each fraction of polymer solution by spectrophotometry, and then calculate the cumulative percentage of each fraction . Combined with static light scattering and viscosity method, the molecular weight of each fraction of the hydrophobically associative polymer is accurately determined, and the molecular weight integral distribution curve or differential distribution curve is obtained according to the molecular weight and cumulative percentage of each fraction.

Description

technical field [0001] The invention relates to a method for measuring the molecular weight distribution curve of a hydrophobic association polymer. Background technique [0002] Hydrophobically Associating Water-Soluble Polymers (HAWSP for short) refers to water-soluble polymers with a small amount of hydrophobic groups on the hydrophilic macromolecular chain of the polymer (Properties of hydrophobically associating polyacrylamides: influence of the method of synthesis . Macromolecules, 1993, 26(17): 4521-4532). Due to the interaction of hydrophobic groups on the macromolecular chain, the polymer will have intramolecular or intermolecular association in aqueous solution. When the concentration of the polymer solution is lower than the critical association concentration (CAC), the intramolecular association is mainly Mainly, when the concentration of the polymer solution reaches the critical association concentration (CAC), the intermolecular association in the solution is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
Inventor 冯茹森郭拥军张新民李华兵杨红梅稽薇
Owner SOUTHWEST PETROLEUM UNIV
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