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Hydrophobic associated polymer molecular weight distribution curve testing method

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

Inactive Publication Date: 2015-12-30
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • 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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  • Hydrophobic associated polymer molecular weight distribution curve testing method
  • Hydrophobic associated polymer molecular weight distribution curve testing method
  • Hydrophobic associated polymer molecular weight distribution curve testing method

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

[0068] Example 3: Molecular Weight Determination of Fractions of Hydrophobically Associating Polymers

[0069] 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 2:

[0070] Table 4: Molecular Characteristic Parameters of Standard Samples

[0071]

[0072] Calibrate the Mark-Houwink equation [η]=KM of the hydrophobic association polymer under this solvent condition α For [η] = 0.182M 0.586 .

[0073] Determination of the intrinsic viscosity of each fraction of the hydrophobic association polymer (HAWSP-3), according to the calibrated Mark-Houwink equation [η] = 0.182M 0.586 , Calculate the molecular weight M of each fraction.

[0074] Table 5 Molecular Weight of ...

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Abstract

The invention provides a hydrophobic associated polymer molecular weight distribution curve testing method. According to the method, hydrophobic association in a hydrophobic associated polymer solution is eliminated firstly under a proper solvent condition, polyelectrolyte effect is shielded, so that macromolecules are in a unimolecular dispersion state in a weak solution, then millipore filter membranes with different pore diameters are selected based on the membrane pore size separation principle, and a hydrophobic associated polymer is graded by means of a millipore filter membrane flow test device so that polymers with different molecular weights are separated; fitting of a percolate mass and filtration time relation curve is conducted with a quadratic equation so as to obtain the mass of a polymer solution in any grade, the concentration of the polymer solution in any grade is measured with the spectrophotometric method, and then the accumulated percentage composition of each grade is calculated. The molecular weight of the hydrophobic associated polymer in any grade is measured accurately with the static light scattering and viscosity method, and a molecular weight integral distribution curve or differential distribution curve is obtained according to the molecular weight of each grade and the accumulated percentage composition.

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) refers to a water-soluble polymer with a small amount of hydrophobic groups on the hydrophilic macromolecular chain of the polymer (Propertiesofhydrophobicallyassociatingpolyacrylamides:influenceofthemethodofsynthesis.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 mainly intermolecular, ...

Claims

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Application Information

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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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