Novel superabsorbent copolymers of partially neutralized methacrylic acid and acrylonitrile: synthesis, characterization and swelling characteristics
| Autor: | K. Sunitha, C. P. Reghunadhan Nair, R. Sadhana, Dona Mathew |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Polymers and Plastics General Chemical Engineering Sodium Radical polymerization chemistry.chemical_element General Chemistry chemistry.chemical_compound Superabsorbent polymer chemistry Methacrylic acid Self-healing hydrogels Polymer chemistry Materials Chemistry Copolymer medicine Acrylonitrile Swelling medicine.symptom Nuclear chemistry |
| Zdroj: | Designed Monomers and Polymers. 18:512-523 |
| ISSN: | 1568-5551 |
| DOI: | 10.1080/15685551.2015.1041082 |
| Popis: | Novel superabsorbent copolymers (SAP) based on random copolymers of sodium methacrylate, methacrylic acid, and acrylonitrile (ACN) of varying compositions and cross-link densities were synthesized by free radical polymerization and were characterized. ACN content in the copolymers varied from 0 to 15 mol%. The SAPs were capable of absorbing 350–990 times their weight of water and 60–130 times their weight of saline (0.3 wt. % solution of sodium chloride in deionized water) depending on the composition and cross-link density of the copolymer. Swelling of the copolymers followed first-order kinetics with non-Fickian swelling behavior in deionized water. Water absorbency (Sw) was found to decrease with pressure on the gel side and a pressure coefficient (dSw/dp) of −0.6%/Pa was estimated for a given composition of the copolymer. Strength of the hydrogels increased with increasing cross-link density. Shear modulus of the hydrogels was found to vary from 1000 to 6000 Pa depending on the composition and cross-l... |
| Databáze: | OpenAIRE |
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