Abstract
To improve the humidity resistance and water absorption capacity of the superabsorbent polymer (SAP), a biodegradable cellulose-containing polymer was successfully assembled through inverse suspension polymerization, using cellulose, acrylic acid, and acrylamide as monomers, Span-80 as dispersant, and potassium persulfate as initiator. The impact of conditions such as reaction temperature, ratio of oil to water, degree of neutralization, amount of cellulose, and cross-linking agents on the properties of the polymer were evaluated. The results showed that the as-prepared superabsorbent polymer exhibited the best water (859 g/g) and salt water (72.48 g/g) absorption rate, when the reaction temperature was 70°C, monomer ratio was 1 : 10, neutralization degree was 75%, and oil-water ratio was 3 : 1. Moreover, the humidity resistance of the polymer could be enhanced significantly by adding different cross-linking reagents such as epoxy chloropropane or diethylene glycol.
Highlights
Superabsorbent polymer with strong hydrophilic groups such as carboxyl and hydroxy can absorb water hundreds of times more than its own weight in a short time and exhibit good water retention even at high temperature and pressure [1,2,3,4]
The superabsorbent polymer has been synthesized through inverse suspension polymerization
The absorption experiments for water and salt water showed that the operating conditions such as monomer dosages, neutralization degree, oil-water ratio, temperature, and the cross-linking agent had great effects on the water absorption
Summary
Superabsorbent polymer with strong hydrophilic groups such as carboxyl and hydroxy can absorb water hundreds of times more than its own weight in a short time and exhibit good water retention even at high temperature and pressure [1,2,3,4]. Zhang et al [11] synthesized the starch graft superabsorbent polymer with larger water absorption capacity through radical polymerization in aqueous solution. Mohammadi-Khoo et al [18] synthesized a cellulose-based biodegradable hydrogel, which exhibited excellent swelling behavior in distilled water, tap water, and 0.9% NaCl solution; it can be employed as a suitable moistureholding additive in the soil for agricultural purposes. It was easy for the reported cellulose-based superabsorbent polymers to absorb moisture, which will. The moisture-proof ability of the resins after modification by different kinds of cross-linking agents was discussed carefully
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