Preparation, characterization, and properties of cellulose–polyacrylamide graft copolymers

Abstract

Graft copolymers of acrylamide on cellulose materials (␣-cellulose 55.8%, DP 287.3) obtained from Terminalia superba wood meal and its carboxymethylated derivative (DS 0.438) were prepared using a ceric ion initiator and batch polymerization and modified batch polymerization processes. The extent of graft polymer formation was measured in graft level, grafting efficiency, molecular weight of grafted polymer chains, frequency of grafting as a function of the polymerization medium, and initiator and monomer concentrations. It was found that the modified batch polymerization process yielded greater graft polymer formation and that graft copolymerization in aqueous alcohol medium resulted in enhanced levels of grafting and formation of many short grafted polymer chains. Viscosity measurements in aqueous solutions of carboxymethyl cellulose-g-polyacrylamide copolymer samples showed that interpositioning of polyacrylamide chains markedly increased the specific viscosity and resistance to biodegradation of the graft copolymers. The flocculation characteristics of the graft copolymers were determined with kaolin suspension.

Calcium carbonate crystallization in the presence of modified polysaccharides and linear polymeric additives

“…The grafting reactions were carried out according to the literature [37][38][39][40][41][42] with some modifications. The reactions were initiated by cerium ions and potassium persulfate for both cellulose and potato starch.…”

Cellulose-based anion exchanger with tertiary amine functionality for the extraction of arsenic(V) from aqueous media

“…Their adsorption capacity for metal ions remains very low in comparison to activated carbon (Aloulou et al, 2006). For modifying natural and synthetic polymers, grafting is preferred to physical blending because the grafted polymer chains are covalently linked and interpositioned on the backbone polymer (Okieimen, 2003). Grafting of synthetic polymers onto solids followed by functionalization is a well-known method for the modification of the physical and chemical properties of the adsorbent and to improve the adsorption capacity (Hegazy et al, 2001).…”

Surface and statistical analysis of CaCO3 crystals synthesized in the presence of fluorescein-tagged starch grafted with polyacrylic acid

“…The grafting reactions were carried out according to the literature [21][22][23][24][25][26] with some modifications. The reactions were initiated by cerium ions and potassium persulfate.…”