Synthesis And Performance Of Salt-tolerant Superabsorbent Polymers Modified By Carboxymethyl Cellulose

Cellulose is the most abundant natural resource, which is renewable, nontoxic and degradable, has been paid much attention by researchers of many countries. But cellulose-modified superabsorbent polymer (SAP) didn't show high sorption and retention capacity in both water and saline solutions, according to the former research repo(?)s. In order to improve the salt tolerance of cellulose-modified SAP, different monomers with anionic, cationic and nonionic hydrophilic group were grafted onto carboxymethyl cellulose (CMC). The factors affecting absorbency of SAP, such as monomers ratio, CMC dosage, content of various initiators and crosslinking agents, neutralization degree of acrylic acid (AA), and synthesis methods were investigated and discussed in detail. Biodegradable cellulose-modified SAPs with high salt tolerance were obtained, and the degradation and application performance of them were determined.Acrylamide (AM) and [2-(methylacryloyloxy)ethyl]trimethylammonium chloride (MAETAC) were grafted onto CMC, and cellulose-modified cationic SAPs with cationic and nonionic hydrophilic group were prepared. Optimal conditions of different synthetic methods, such as solution polymerization, inverse suspension polymerization, and microwave radiation polymerization, were obtained respectively. ICAM, the cellulose-modified cationic SAPs prepared by inverse suspension polymerization, were found to have better perfo(?)ance than SCAM prepared by solution polymerization and MCAM prepared by microwave radiation polymerization.ICAM has the absorbent capacity of 657 times their own weight in distilled water, 273 times in tap water, and 165 times in 0.9% saline solution.AA, AM and MAETAC were grafted onto CMC, and cellulose-modified amphoteric SAPs with anionic, cationic and nonionic hydrophilic group were prepared. Optimal...