Kinetics and In Situ Rheological Behavior of Acrylamide Redox Polymerization

Khai Ern Lee, Norhashimah Morad, Tjoon Tow Teng, Beng Teik Poh

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Acrylamide was polymerized through redox polymerization using ammonium persulphate and sodium bisulfite as redox initiator. The kinetics of acrylamide redox polymerization was determined through gravimetric method. The initial acrylamide redox polymerization rate was found to depend on the feed concentration given by: Rate = k[AM] 1.12[(NH 4) 2S 2O 8] 0.53[NaHSO 3] 0.47 Activation energy (Ea) of 38.1 ± 0.2 kJ/mol was obtained over temperature range 45-65°C using Arrhenius equation. Activation enthalpy (δH ) of 35.44 kJ/mol and activation entropy (δS) of-51.19 J/mol · K were determined from Eyring equation. 98.9% of polyacrylamide conversion was obtained from 1.00 M acrylamide after 60 minutes of polymerization at 50°C. The in situ rheological behavior of polymerized acrylamide solutions were investigated using steady-state flow and oscillatory frequency sweep tests within the linear viscoelastic region. The viscosities of the polymerized acrylamide solutions increased with the polymerization time. The elastic behavior (G′) was found to be dominant for high acrylamide feed concentration in polymerized acrylamide solution while the viscous behavior (G″″) was found to be dominant for low acrylamide feed concentration.

Original languageEnglish
Pages (from-to)387-395
Number of pages9
JournalJournal of Dispersion Science and Technology
Volume33
Issue number3
DOIs
Publication statusPublished - Mar 2012
Externally publishedYes

Fingerprint

Acrylamide
polymerization
Polymerization
Kinetics
kinetics
Chemical activation
activation
Ammonium persulfate
equilibrium flow
sweep frequency
initiators
Polyacrylates
Enthalpy
Entropy
Activation energy
enthalpy
Sodium
sodium
Oxidation-Reduction
Viscosity

Keywords

  • Acrylamide
  • kinetics
  • redox polymerization
  • rheological behavior

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Surfaces, Coatings and Films

Cite this

Kinetics and In Situ Rheological Behavior of Acrylamide Redox Polymerization. / Lee, Khai Ern; Morad, Norhashimah; Teng, Tjoon Tow; Poh, Beng Teik.

In: Journal of Dispersion Science and Technology, Vol. 33, No. 3, 03.2012, p. 387-395.

Research output: Contribution to journalArticle

Lee, Khai Ern ; Morad, Norhashimah ; Teng, Tjoon Tow ; Poh, Beng Teik. / Kinetics and In Situ Rheological Behavior of Acrylamide Redox Polymerization. In: Journal of Dispersion Science and Technology. 2012 ; Vol. 33, No. 3. pp. 387-395.
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