Synthesis and optimization of polyacrylamide and gum arabic graft copolymer

Abstract

Graft copolymerization of polyacrylamide onto gum arabic was carried out in aqueous medium at room temperature (30 o C) using various initiator (ceric ion) and monomer (acrylamide) concentrations. The extent of graft copolymer formation was determined in terms of percentage graft yield. The results obtained showed that the percentage yield of the graft copolymer is a function of both the initiator and monomer concentrations. The grafted copolymer was characterized by infrared (IR) spectroscopy. The IR spectral data for pure Gum Arabic (GA) and that of Gum Arabic-grafted Polyacrylamide (GA-g-PAAM) indicate that grafting actually occurred. The successful grafting of polyacrylamide onto gum arabic will enhance the search for materials transformation through chemical derivatization with attendant expansion of their spectra of application.

Zeolite reinforced carboxymethyl cellulose‐Na+‐g‐cl‐poly(AAm) hydrogel composites with pH responsive phosphate release behavior

“…The polymerization was initiated by addition of APS at temperature 60–70 °C. The occluded polyacrylamide, residual acrylamide, and other impurities were removed from the final composites by repeated solvent extraction with ethanol and methanol in succession . The crosslinked gel mass was then air dried till constant weight.…”

“…In the present study, three different types of ZMHC composites (ZMHC‐1, ZMHC‐2, and ZMHC‐3) were prepared by varying the zeolite content in feed mass keeping all other reactant ratios constant and their synthesis parameters are depicted in Table . The percent grafting yield was calculated as follows: …”

Physical, Chemical, and Rheological Properties of Rice Husks Treated by Composting Process

“…Various methods such as mechanical (Alang et al 2011), physical (Imanah and Okieimen 2004;Iyasele and Okieimen 2004), chemical (Nigam et al 2009;Cheng et al 2010), and steam explosion (Kristensen et al 2008) have been discussed to improve the processability of lignocellulosic fibers. Physical treatments include soaking/wetting, chopping, grinding, pelleting, steaming under pressure, and gamma radiation.…”