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Fluorescent Labeling of Ultrahigh Molecular Weight Polyacrylamide Polymers in Microemulsion Systems
Maged F Serag1, Enoc Basilio2, Antonia Sugar2
1Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), KAUST 4700, Thuwal 23955-6900, Saudi Arabia.
ACS Omega
|April 14, 2025
Summary
We developed a new method to fluorescently label ultrahigh molecular weight polymers, like partially hydrolyzed polyacrylamide (HPAM), making them easier to purify and study. This technique helps understand polymer behavior in complex industrial fluids.
Area of Science:
- Polymer Chemistry
- Materials Science
- Physical Chemistry
Background:
- Fluorescent labeling of ultrahigh molecular weight polymers is essential for studying their behavior in complex systems.
- Existing methods face challenges in purification, limiting their application.
- Partially hydrolyzed polyacrylamide (HPAM) is critical in various industrial processes.
Purpose of the Study:
- To develop an efficient postpolymerization fluorescent labeling method for high molecular weight polymers.
- To enable simultaneous labeling and purification of polymers.
- To investigate the interactions of labeled HPAM with surfactant micelles in microemulsions.
Main Methods:
- Postpolymerization labeling of polyacrylamide (up to 20 MDa) using EDC/NHS coupling reagents and iFluor 647 amine dye.
- Simultaneous labeling and purification achieved by manipulating reagent concentrations.
- Characterization using spectroscopic, microscopic, and single-molecule techniques.
- Investigation of polymer-micelle interactions in Winsor-type microemulsions.
Main Results:
- Successful fluorescent labeling of HPAM with preserved polymer integrity.
- Demonstrated simultaneous labeling and purification of polymers up to 20 MDa.
- Visualized HPAM interactions with surfactant micelles, showing partial enwrapping and penetration.
- Provided direct evidence supporting theoretical models of polymer-micelle complexation.
Conclusions:
- The developed method offers efficient fluorescent labeling and purification for high molecular weight polymers.
- The study provides crucial insights into polymer-surfactant interactions in complex fluids.
- Findings can optimize HPAM applications in enhanced oil recovery, wastewater treatment, and other industries.
