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Characterization method of polymer gel point based on complex wave constant rate temperature sweep rheology

A polymer and composite wave technology, applied in the field of polymer gel rheology characterization, can solve the problems of difficult to obtain gel point data and easy change of gel structure.

Inactive Publication Date: 2021-07-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sol-gel transition process is very sensitive, and changes in various environmental conditions have a great impact on the results, and the gel structure is prone to change, making it difficult to obtain accurate gel point data

Method used

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  • Characterization method of polymer gel point based on complex wave constant rate temperature sweep rheology

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] (1) Preparation of aqueous gelatin solution:

[0034] Add the gelatin to a wide-mouthed glass bottle with a lid and a magnetic stirrer filled with ultrapure water with a conductivity equal to 18.2MΩ·cm, let it stand in a water bath at 60°C for 20 minutes, and stir vigorously (400-800rpm, 1h), finally dissolving the gelatin to form a clear and transparent liquid to obtain a mixed gelatin aqueous solution, wherein the mass fraction of gelatin is 6 wt%.

[0035] (2) Characterize the microstructure and viscoelasticity of the mixed gelatin aqueous solution sample under oscillating shear conditions, that is, the multiwave rheological test.

[0036] After installing the upper and lower fixtures of the coaxial cylinder on the rheometer, the automatic clearance is reset to zero, the upper fixture is raised, the gelatin aqueous solution sample is loaded into the lower fixture of the coaxial cylinder, and the fixture gap is automatically adjusted to the test gap. Loading complete...

Embodiment 1

[0043]The gel point characterization method of 6wt% gelatin based on the mass fraction of complex wave constant rate temperature scanning rheological test, the specific steps are as follows:

[0044] (1) Accurately and quickly weigh 6.3830g of dry gelatin, add it to a jar equipped with a stirring bar, measure 100mL ultrapure water with a graduated cylinder, add it to the jar, tighten the bottle cap, and place it in a water bath at 60°C After standing still for 20 minutes, stir at a stirring speed of 500 rpm for 1 hour to obtain a transparent and clear solution as a sample;

[0045] (2) Carry out the composite wave constant rate temperature scanning test on the sample. The test parameters of the complex wave constant rate temperature scanning test are: the equilibrium temperature is 60°C, the equilibrium time is 300s; the initial temperature is set to 60°C, and the temperature scanning rate is The temperature is 5°C / min, the end temperature is 28°C, the holding time at the end ...

Embodiment 2

[0049] The gel point characterization method of 6wt% gelatin based on the mass fraction of complex wave constant rate temperature scanning rheology test, the specific steps are as follows:

[0050] (1) Accurately and quickly weigh 6.3830g of dry gelatin, add it to a jar equipped with a stirring bar, measure 100mL ultrapure water with a graduated cylinder, add it to the jar, tighten the bottle cap, and place it in a water bath at 60°C After standing still for 20 minutes, stir at a stirring speed of 500 rpm for 1 hour to obtain a transparent and clear solution as a sample;

[0051] (2) Carry out the composite wave constant rate temperature scanning test on the sample. The test parameters of the complex wave constant rate temperature scanning test are: the equilibrium temperature is 60°C, the equilibrium time is 300s; the initial temperature is set to 60°C, and the temperature scanning rate is The temperature is 5°C / min, the end temperature is 29.4°C, the holding time at the end ...

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Abstract

The invention belongs to the field of polymer gel rheological characterization, and discloses a polymer gel point characterization method based on complex wave constant rate temperature scanning rheology, including: mixing polymer precursor liquid on a rheometer After loading the sample, set the equilibrium resting temperature, equilibrium resting time and complex wave equal variable rate temperature scanning rheological test parameters on the rheometer; start the rheometer and start the complex wave equal variable rate temperature scanning rheological test , to obtain the test data, and use the interpolation method to directly obtain the viscoelastic spectrum data of the polymer at different angular frequencies at different times; combined with time-resolved technology, the evolution of the viscoelastic spectrum with time is obtained, and the gelation transition process of the polymer is fully characterized structural changes in . The invention can fully characterize the structural change of the gelling material during the gelation transition process, and provide guidance with important reference value for the production, processing and application of the polymer gel material.

Description

technical field [0001] The invention belongs to the field of polymer gel rheological characterization, and relates to a polymer gel point characterization method based on complex wave equal variable rate temperature scanning rheology. Background technique [0002] Polymer gel has a wide range of applications in industry due to its gelling and water absorption properties, such as food glue, oil plugging agent, spinning additive, etc. When the polymer solution reacts to a certain extent or is affected by certain conditions, a network structure begins to form, and the viscosity of the system increases suddenly. The degree of reaction at this time is called the gel point. The sol-gel transition is affected by many factors such as temperature, pH, and electrolyte. However, different industrial productions have different requirements for polymer gels, and it is necessary to have a solid understanding of the temperature, time, and environmental conditions for their gelation. There...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/00
CPCG01N11/00G01N2011/002
Inventor 孙尉翔汪晓岚代迎康王涛童真
Owner SOUTH CHINA UNIV OF TECH
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