Synthesis and characterization of highly elastic superabsorbent natural rubber/polyacrylamide hydrogel
| Autor: | Kanda Junlapong, Chuanpit Khaokong, Pattarawadee Maijan, Jiranun Arayaphan, Sirinya Chantarak |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Polyacrylamide Hydrogel
Absorption of water Aqueous solution Polymers and Plastics Chemistry Cationic polymerization 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Adsorption Chemical engineering Physisorption Natural rubber Mechanics of Materials visual_art Self-healing hydrogels Materials Chemistry visual_art.visual_art_medium 0210 nano-technology |
| Zdroj: | Polymer Degradation and Stability. 186:109499 |
| ISSN: | 0141-3910 |
| DOI: | 10.1016/j.polymdegradstab.2021.109499 |
| Popis: | A hydrogel based on natural rubber (NR) was developed. NR was simultaneously incorporated within NR-graft-polyacrylamide (NR-g-PAM) hydrogel to form, via physical chain entanglement, a freely mobile secondary polymer network. A semi-interpenetrating polymer network (semi-IPN) was formed. The amount of NR in the hydrogel was varied from 0 wt% to 50 wt% to optimize both mechanical and physical properties. The water absorption capacity of a hydrogel with 30 wt% of NR (30NR) was 15,200%. The compressive modulus of 30NR was 106.5 kPa, 650% higher than that of a pure PAM hydrogel. The formation of the semi-IPN structure improved mechanical properties while maintaining the adsorption performances of the hydrogels. NR-g-PAM hydrogels at all NR contents adsorbed cationic and anionic azo dyes. 30NR removed 90% of methylene blue (MB) from aqueous solution in less than 24 h with a maximum adsorption capacity of 538.3 mg g−1. Fitting the experimental data from 30NR to theoretical adsorption isotherms and the results of thermodynamic study indicated a monolayer adsorption of MB on a homogeneous surface via physisorption and the adsorption process was endothermic. This hydrogel showed reusability for MB removal, with efficiency as high as 70% on the 10th cycle. The NR-g-PAM hydrogels were photodegradable upon exposure to heat, UV light, and moisture. |
| Databáze: | OpenAIRE |
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