Synthesis, characterization and effect of reaction parameters on swelling properties of acrylamide-sodium methacrylate superabsorbent copolymers

Murali Yallapu, P. S.Keshava Murthy, K. Mohana Raju

Research output: Contribution to journalArticle

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Abstract

Superabsorbent copolymers (SAPs) based on acrylamide (AAM) and sodium methacrylate (NMA) were prepared by simultaneous free radical polymerization in aqueous solution using ammonium persulfate (APS) and N,N,N′,N′- tetramethylethylenediamine (TMEDA) as initiating systems at room temperature. Eight different copolymers were prepared by varying NMA with a fixed concentration of acrylamide and 1,4-butanediol diacrylate (BDDA) or ethyleneglycol dimethacrylate (EGDMA) as crosslinkers. The acrylamide-sodium methacrylate (AAM-NMA) SAP formation was confirmed by IR spectroscopy. The percentage of swelling, swelling and diffusion kinetic parameters (i.e., initial swelling network constant, swelling rate constant, maximum swelling equilibrium, network structure constant and type of diffusion, etc.) were investigated for all the SAPs at 25 °C. The swelling behaviour was also studied at different temperatures ranging from 10 to 50°C. The effect of different reaction parameters, such as, crosslinker, initiator and activator concentrations on the swelling capacity was investigated. The effect of variation of crosslinker concentration on the copolymer network structure was studied by SEM analysis. Further the saline sensitivity of the copolymers was investigated at different saline concentrations. The effect of pH and de-swelling behaviour for AAM-NMA SAPs prepared at optimum reaction conditions was studied.

Original languageEnglish (US)
Pages (from-to)11-26
Number of pages16
JournalReactive and Functional Polymers
Volume63
Issue number1
DOIs
StatePublished - Apr 1 2005

Fingerprint

Acrylamide
swelling
Swelling
Copolymers
Sodium
sodium
Temperature
Polymerization
Free Radicals
Spectrum Analysis
Ammonium persulfate
methacrylic acid
effect
parameter
free radical
Free radical polymerization
Kinetic parameters
polymerization
Infrared spectroscopy
Rate constants

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Biochemistry
  • Chemical Engineering(all)
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Synthesis, characterization and effect of reaction parameters on swelling properties of acrylamide-sodium methacrylate superabsorbent copolymers. / Yallapu, Murali; Murthy, P. S.Keshava; Raju, K. Mohana.

In: Reactive and Functional Polymers, Vol. 63, No. 1, 01.04.2005, p. 11-26.

Research output: Contribution to journalArticle

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