A Quantitative Approach to Determine Hydrophobe Content of Associating Polyacrylamide Using a Fluorescent Probe

Hydrophobically associating polymers have found widespread applications in many domains due to their unique rheological behavior, which is primarily dictated by the hydrophobe content. However, the low fraction of hydrophobic monomers in polymers makes this parameter's precise and straightforwa...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2023-05, Vol.28 (10), p.4152
Main Authors: Su, Ziyang, Zhang, Yu, Liu, Weidong, Han, Ruijing, Zhao, Xuezhi, Shi, Xiaohuo, Lu, Xingyu, Zhang, Yan, Feng, Yujun
Format: Article
Language:English
Subjects:
Aqueous solutions
Fluorescence
fluorescence spectra
Fluorescent indicators
hydrophobe content
hydrophobically associating polymer
Hydrophobicity
Investigations
Magnetic resonance spectroscopy
NMR
NMR spectroscopy
Nuclear magnetic resonance
Polyacrylamide
Polymer industry
Polymerization
Polymers
Rheological properties
scaling relationship
Technology application
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Summary:Hydrophobically associating polymers have found widespread applications in many domains due to their unique rheological behavior, which is primarily dictated by the hydrophobe content. However, the low fraction of hydrophobic monomers in polymers makes this parameter's precise and straightforward measurement difficult. Herein, a variety of hydrophobically associating polyacrylamides (HAPAM) with different alkyl chain lengths ( ) and hydrophobic contents ([ ]) were prepared by post-modification and accurately characterized by H NMR spectroscopy. The maximal fluorescence emission intensity ( ) of 8-anilino-1-naphthalenesulfonic acid, which is sensitive to hydrophobic environments, was then detected in those polymer solutions and shown as a ratio to that in the polymer-free solution ( ). It was found that / for 0.5 wt% HAPAM can be scaled versus , which is a variate related to both and [ ], as / = 1.15 + 1.09 × 10 , which was also verified to be applicable for hydrophobic associating hydrolyzed polyacrylamide (HHAPAM). This relationship provides a handy method for determining the hydrophobic content of hydrophobically associating polymers, particularly for field applications.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules28104152