Effect of Chain Length of the Alkyl Group of Alkyl Methacrylates on Graft Polymerization Onto Starch Using Ceric Ammonium Nitrate as Initiator

J of Applied Polymer Sci

İyim

et al. 2008

122

The graft copolymerization of acrylic acid (AA) onto starch was carried out with monomer/starch weight ratio 5 1.5. Cerium ammonium nitrate (CAN) and N,N 0 -methylenebis acrylamide (NMBA) were used as initiator and crosslink agent, respectively. Na-montmorillonite was used as nanoparticles. Starch-graft-acrylic acid/Na-MMT (S-g-AA/MMT) nanocomposite hydrogels were characterized by X-ray diffraction (XRD) and FTIR analysis. The effect of Na-MMT content in nanocomposite hydrogels on the swelling behavior was investigated. Increasing the Na-MMT/monomers ratio up to 1% causes an increment in water absorbency, which indicates that Na-MMT can improve the ability of water absorbency but further increase of Na-MMT causes a decrease in water absorbency. In addition, we describe the removal of safranine T from aqueous solutions using S-g-AA/MMT nanocomposite hydrogels. Effects of various parameters such as treatment time, initial dye concentration, and amount of the Na-MMT were investigated. The Freundlich equations were used to fit the equilibrium isotherms.

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of starch‐graft‐acrylic acid/Na‐montmorillonite superabsorbent nanocomposite hydrogels

J of Applied Polymer Sci

İyim

et al. 2008

122

“…Chemical modification of starch via oxidation, hydrolysis, esterification, etherification, and grafting have been extensively studied. 1 Grafting of acrylamide, 1-4 acrylonitrile, 2,5,6 methylacrylonitrile, 7 alkyl methacrylates, 8,9 vinyl ketones, 10 2-(dimethylamino)ethyl methylacrylate, 11 and acrylic acid (AA) [12][13][14][15][16] onto starch has been investigated. The chemical grafting of vinyl monomers onto polysaccharides has been the subject of extensive investigation using tetravalent cerium and other initiating systems.…”

Section: Introductionmentioning

confidence: 99%

Removal of basic dyes from aqueous solutions using starch‐graft‐acrylic acid copolymers

J of Applied Polymer Sci

Keleş

2007

Graft copolymerization of acrylic acid (AA) onto starch was carried out with ceric ammonium nitrate as initiator under nitrogen atmosphere. The grafting percentages (GP%) of starch‐graft‐AA (St‐gr‐AA) copolymers were determined. When the AA molar concentrations were 0.3 and 0.5 mol/L, GP% of St‐gr‐AA copolymers were 10.5% (St‐gr‐AA‐1) and 14% (St‐gr‐AA‐2), respectively. St‐gr‐AA copolymers have been used for the adsorption of basic dye (Safranine T) from aqueous solutions. Effects of various parameters such as treatment time, initial pH of the solution (pH = 2–6), initial dye concentration (50– 500 mg/L), and GP% of starch graft copolymers were investigated.Basic dye removal capacities of the copolymers increase along with the augment of initial concentration of the adsorbate, GP% of the copolymers, and pH. The adsorption capacities for St‐gr‐AA‐1 and St‐gr‐AA‐2 reach 116.5 and 204 mg/g, respectively. Equilibrium adsorption data were obtained and fitted very well to Freundlich model. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007

“…Chemical modification of starch via oxidation, hydrolysis, esterification, etherification, and grafting have been extensively studied [2] . Grafting of acrylamide [2][3][4][5] , acrylonitrile [3,6] , methylacrylonitrile [7] , alkyl methacrylates [8,9] , vinyl ketones [10] , 2-(dimethylamino)ethyl methylacrylate [11] , and acrylic acid (AA) [12][13][14] onto starch has been investigated. The chemical grafting of vinyl monomers onto polysaccharides using tetravalent cerium and other initiating systems has been the subject of extensive investigation [6] .…”

Section: Introductionmentioning

confidence: 99%

Removal of Cu²⁺Ions from Aqueous Solutions by Starch-Graft-Acrylic Acid Hydrogels

Keleş

Polymer-Plastics Technology and Engineering

2006

Gelatinized starch was prepared by constantly stirring a mixture of starch and water at 95 C for 1 hour. Starch-graft-acrylic acid (S-g-AA) hydrogels were prepared by grafting acrylic acid (AA) [monomer=starch (w=w) 0.5-1.5] onto gelatinized starch with ceric ammonium nitrate as initiator under nitrogen atmosphere. The surface morphology of samples was studied using a scanning electron microscope (SEM). The hydrogels were evaluated for the removal of Cu 2þ ion from aqueous solutions at different pH. The concentration of Cu 2þ ion in aqueous solution was kept constant at 4 mmol=L. The metal ion removal capacities changed depending on treatment time, initial pH of the solution, and monomer=starch (w=w) ratio of the S-g-AA hydrogels. Cu 2þ ion removal capacities were determined by atomic absorption spectrometer (AAS).