Graft Copolymerization of Acrylic Monomers onto Coir Dust by Using Gamma Irradiator of Co-60 Source for Superabsorbent Polymer

Graft copolymers of acrylic monomers with cotton cellulose were obtained. The dependence of the degree and efficiency of grafting of acrylic acid and methyl methacrylate to cellulose on the concentration of monomer and initiator was investigated. Pre-adsorption of the initiator in the macromolecules of cellulose leads to an increase in the efficiency of the grafting. The efficiency of grafting is higher in those systems in which the initiator used is insoluble in the monomer solvent. Absorption of cellulose with an aqueous solution of the initiator - potassium persulfate, followed by removal of water was done. The advantage of using a water-soluble initiator is that during subsequent processing with a solution of monomer in an organic solvent, the desorption of the active centers does not occur. An increase in the concentration of theinitiator leads to an increase in the degree of grafting, a slight increase in the efficiency of the grafting, a significant decrease in the degree of polymerization and the molecular weight of the graft chains. In a heterogeneous process, an increase in the efficiency of grafting with an increase in the concentration of theinitiator is promoted by the additional adsorption interaction of the initiator molecules with the surface of cellulose. With an increase in the concentration of monomers, the overall degree of conversion slightly increases, the efficiency of grafting slightly decreases, the degree of grafting and the molecular weight of the graft chains increase significantly. The mechanism of graft copolymerization was investigated by comparative analysis of the IR and PMR spectra of cellulose, potassium persulfate, acrylic monomers and products of their interaction. Due to the results of spectroscopic studies, a scheme of graft copolymerization reactions has been proposed. The active centers of graft copolymerization are formed as a result of the reductive interaction of potassium persulfate, water and cellulose macromolecules.

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Nonwovens Containing Immobilized Superabsorbent Polymer Particles

International Nonwovens Journal ◽

10.1177/1558925003os-1200311 ◽

2003 ◽

Vol os-12 (3) ◽

pp. 1558925003os-12

Author(s):

Darryl L. Whitmore

Keyword(s):

In Situ Polymerization ◽

Ph Control ◽

Personal Hygiene ◽

Superabsorbent Polymer ◽

Polymer Particles ◽

Superabsorbent Polymers ◽

Acrylic Monomers

In the early 1980's Johnson & Johnson developed a revolutionary process for the production of webs containing superabsorbent polymers (SAP) produced by in-situ polymerization of partially neutralized acrylic monomers directly on a synthetic nonwoven substrate [1, 2, 3, 4]. A fresh look at this forgotten technology will be presented from both a manufacturing and application perspective. In particular, In-situ, SAP-containing nonwovens offer many unique properties for application in the personal hygiene industry, such as, improved fluid acquisition, permeability, compressibility and pH control. These materials also provide a more homogenous SAP distribution, eliminate the need for SAP powder handling and have superior wet integrity as compared to conventional fluff pulp/SAP air laid structures. This technology also offers some unique opportunities for designing and manufacturing profiled absorbent articles with specific zones tailored to perform specific functions.

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Morphological Study of Superabsorbent Polymer Hydrogels from Sago Starch

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.576.338 ◽

2012 ◽

Vol 576 ◽

pp. 338-341 ◽

Cited By ~ 1

Author(s):

O. Nurizan ◽

Ahmad Zuraida ◽

Nordin Norhuda Hidayah

Keyword(s):

Graft Copolymerization ◽

Water Absorbency ◽

Superabsorbent Polymer ◽

Sago Starch ◽

Sem Images ◽

Porosity Distribution ◽

Remarkable Feature ◽

Ammonium Persulphate ◽

Polymer Hydrogels ◽

Sanitary Products

This paper comprises of the characterizations of superabsorbent polymer hydrogels based on sago starch (SS) prepared via graft copolymerization method with acrylic acid (AA) in the presence of ammonium persulphate (APS) and N, N-metylenebisacrylamide. The morphology of sago-g-acrylic (SAG) was evidenced by scanning electron microscope (SEM) images. The remarkable feature of this SAG is the porosity distribution with different amount of crosslinker. Less amount of crosslinker leads to increment in porosity distribution as well as water absorbency. This SAG with excellent water absorbency properties, being biodegradable in nature could be useful in sanitary products, horticulture and agriculture.

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