Superabsorbent Polymer Based on Sodium Carboxymethyl Cellulose Grafted Polyacrylic Acid by Inverse Suspension Polymerization

Pairote Klinpituksa,Patchareeya Kosaiyakanon

doi:10.1155/2017/3476921

Abstract

A superabsorbent polymer (SAP) based on graft copolymerization of sodium carboxymethyl cellulose and acrylic acid was prepared by inverse suspension polymerization using potassium persulfate as an initiator and N,N′-methylenebisacrylamide as a cross-linker. Experiments were performed at 70°C for 90 min but varying the concentrations of sodium carboxymethyl cellulose (NaCMC), acrylic acid (AA), potassium persulfate (KPS), and N,N′-methylenebisacrylamide (MBA), and also varying % neutralization of AA. The maximum swelling capacity for SAP was 544.95 g/g in distilled water and 44.0 g/g in 0.9% w/v NaCl solution. This near optimal SAP was prepared using 2.0 g/100 mL NaCMC, 1.0 mol/L AA with 70% neutralization, 0.014 mol/L KPS, and 0.01 mol/L MBA.

Highlights

Superabsorbent polymers (SAPs) are cross-linked networks of a hydrophilic polymer, with a high capacity for water uptake [1]
Examples of such research include CMC-g-poly(AA-co-AM) [4], CMC-g-poly(NaAA) [5,6,7], CMC-g-poly(NaAA)/Kaolin [6], Poly CMC/poly(AA) [8], CMC-g-poly(AM-co-AMPS) [9], and CMC-g-poly(AA-co-AMPS) [10]. These studies have demonstrated that the introduction of hydrophilic monomers enhances or greatly improves the water absorbency and the swelling rate of superabsorbent polymer (SAP)
Few studies have reported on preparation of SAPs by inverse suspension polymerization, such as CMC-g-poly(AM-coMAETAC) [12]

Summary

Introduction

Superabsorbent polymers (SAPs) are cross-linked networks of a hydrophilic polymer, with a high capacity for water uptake [1]. Examples of such research include CMC-g-poly(AA-co-AM) [4], CMC-g-poly(NaAA) [5,6,7], CMC-g-poly(NaAA)/Kaolin [6], Poly CMC/poly(AA) [8], CMC-g-poly(AM-co-AMPS) [9], and CMC-g-poly(AA-co-AMPS) [10] These studies have demonstrated that the introduction of hydrophilic monomers enhances or greatly improves the water absorbency and the swelling rate of SAP. Few studies have reported on preparation of SAPs by inverse suspension polymerization, such as CMC-g-poly(AM-coMAETAC) [12]. They have stated that the hydrophilelipophile balance (HLB) of stabilizer is of great importance to enhancing the swelling capacity of a cationic superabsorbent polymer

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