Effective Enhancement of Water Absorbency of Itaconic Acid Based-Superabsorbent Polymer via Tunable Surface—Crosslinking

A superabsorbent polymer (SAP) was synthesized by copolymerizing itaconic acid and vinyl sulfonic acid. The typically low absorbency of itaconic acid-based SAPs under mechanical loads was improved by introducing surface crosslinking. Fourier-transform infrared spectroscopy and X-ray photoelectron sp...

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Bibliographic Details
Published in:Polymers 2021-08, Vol.13 (16), p.2782
Main Authors: Kwon, Yong-Rok, Kim, Jung-Soo, Kim, Dong-Hyun
Format: Article
Language:English
Subjects:
Acids
Aqueous solutions
Chemical synthesis
Copolymerization
Crosslinking
Distilled water
Fourier transforms
Infrared spectroscopy
Itaconic acid
Moisture content
Photoelectrons
Polymerization
Retention
Rheology
Shear strain
Solvents
Spectrum analysis
Sulfonic acid
Superabsorbent polymers
Surface chemistry
Water absorption
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Summary:A superabsorbent polymer (SAP) was synthesized by copolymerizing itaconic acid and vinyl sulfonic acid. The typically low absorbency of itaconic acid-based SAPs under mechanical loads was improved by introducing surface crosslinking. Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy were used to characterize the synthesis and surface-crosslinking reactions in the SAP. Various conditions for surface-crosslinking reactions, such as the surface-crosslinking solution, content of surface-crosslinking agent, and reaction temperature, were explored and correlated with the gel strength and absorption characteristics of the resulting SAP particles. The distilled water content in the surface-crosslinking solution strongly influenced the absorption capacity of the SAP, but this sensitivity decreased when acetone was used as a co-solvent. Itaconic acid-based SAP that was crosslinked under optimal conditions exhibited centrifuge retention capacity and absorbency under a load of 31.1 and 20.2, respectively.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym13162782