Response surface modeling of polyacrylamide redox polymerization

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Abstract

Polyacrylamide was obtained through redox polymerization in a single batch reactor. Redox initiators, consisting of ammonium persulphate and sodium bisulfite, were applied in initiating the redox polymerization. Response surface methodology (RSM) was used to optimize the polymerization process. Four design parameters i.e. temperature, concentrations of acrylamide, ammonium persulphate and sodium bisulfite were taken into account for optimization. An empirical model was constructed in terms of related significant design parameters to describe the polyacrylamide conversion (%) as the response. Based on the response surface plots and analysis of variance (ANOVA), optimum redox polymerization obtained was: 1.0335M acrylamide, 5×10<sup>-4</sup> M ammonium persulphate and 1×10<sup>-4</sup> M sodium bisulfite under 65°C, producing 96.89% of polyacrylamide in 10 minutes. FT-IR, GPC and TEM analysis were carried out to investigate the changes of chemical functional groups and molecular structure during the conversion of acrylamide to polyacrylamide. The weight average molecular weight of the polyacrylamide produced was 1.66 × 10<sup>6</sup> Da. Vinyl group, which existed in acrylamide FT-IR spectra, disappeared during the conversion of acrylamide into polyacrylamide, and it was replaced by a new alkyl group. The viscosity of aqueous polyacrylamide solution increased with the concentration. Polyacrylamide was observed in linear tree-roots-like structure under TEM viewing.

Original languageEnglish
Pages (from-to)2697-2710
Number of pages14
JournalInternational Journal of ChemTech Research
Volume7
Issue number6
Publication statusPublished - 2014

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Polyacrylates
Polymerization
Acrylamide
Ammonium persulfate
Sodium
Transmission electron microscopy
Oxidation-Reduction
polyacrylamide
Batch reactors
Analysis of variance (ANOVA)
Functional groups
Molecular structure
Molecular weight
Viscosity
sodium bisulfite
ammonium peroxydisulfate

Keywords

  • Optimization
  • Polyacrylamide
  • Redox polymerization
  • Response surface methodology

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

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title = "Response surface modeling of polyacrylamide redox polymerization",
abstract = "Polyacrylamide was obtained through redox polymerization in a single batch reactor. Redox initiators, consisting of ammonium persulphate and sodium bisulfite, were applied in initiating the redox polymerization. Response surface methodology (RSM) was used to optimize the polymerization process. Four design parameters i.e. temperature, concentrations of acrylamide, ammonium persulphate and sodium bisulfite were taken into account for optimization. An empirical model was constructed in terms of related significant design parameters to describe the polyacrylamide conversion ({\%}) as the response. Based on the response surface plots and analysis of variance (ANOVA), optimum redox polymerization obtained was: 1.0335M acrylamide, 5×10-4 M ammonium persulphate and 1×10-4 M sodium bisulfite under 65°C, producing 96.89{\%} of polyacrylamide in 10 minutes. FT-IR, GPC and TEM analysis were carried out to investigate the changes of chemical functional groups and molecular structure during the conversion of acrylamide to polyacrylamide. The weight average molecular weight of the polyacrylamide produced was 1.66 × 106 Da. Vinyl group, which existed in acrylamide FT-IR spectra, disappeared during the conversion of acrylamide into polyacrylamide, and it was replaced by a new alkyl group. The viscosity of aqueous polyacrylamide solution increased with the concentration. Polyacrylamide was observed in linear tree-roots-like structure under TEM viewing.",
keywords = "Optimization, Polyacrylamide, Redox polymerization, Response surface methodology",
author = "Lee, {Khai Ern} and Goh, {Thian Lai} and Norbert Simon",
year = "2014",
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volume = "7",
pages = "2697--2710",
journal = "International Journal of ChemTech Research",
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T1 - Response surface modeling of polyacrylamide redox polymerization

AU - Lee, Khai Ern

AU - Goh, Thian Lai

AU - Simon, Norbert

PY - 2014

Y1 - 2014

N2 - Polyacrylamide was obtained through redox polymerization in a single batch reactor. Redox initiators, consisting of ammonium persulphate and sodium bisulfite, were applied in initiating the redox polymerization. Response surface methodology (RSM) was used to optimize the polymerization process. Four design parameters i.e. temperature, concentrations of acrylamide, ammonium persulphate and sodium bisulfite were taken into account for optimization. An empirical model was constructed in terms of related significant design parameters to describe the polyacrylamide conversion (%) as the response. Based on the response surface plots and analysis of variance (ANOVA), optimum redox polymerization obtained was: 1.0335M acrylamide, 5×10-4 M ammonium persulphate and 1×10-4 M sodium bisulfite under 65°C, producing 96.89% of polyacrylamide in 10 minutes. FT-IR, GPC and TEM analysis were carried out to investigate the changes of chemical functional groups and molecular structure during the conversion of acrylamide to polyacrylamide. The weight average molecular weight of the polyacrylamide produced was 1.66 × 106 Da. Vinyl group, which existed in acrylamide FT-IR spectra, disappeared during the conversion of acrylamide into polyacrylamide, and it was replaced by a new alkyl group. The viscosity of aqueous polyacrylamide solution increased with the concentration. Polyacrylamide was observed in linear tree-roots-like structure under TEM viewing.

AB - Polyacrylamide was obtained through redox polymerization in a single batch reactor. Redox initiators, consisting of ammonium persulphate and sodium bisulfite, were applied in initiating the redox polymerization. Response surface methodology (RSM) was used to optimize the polymerization process. Four design parameters i.e. temperature, concentrations of acrylamide, ammonium persulphate and sodium bisulfite were taken into account for optimization. An empirical model was constructed in terms of related significant design parameters to describe the polyacrylamide conversion (%) as the response. Based on the response surface plots and analysis of variance (ANOVA), optimum redox polymerization obtained was: 1.0335M acrylamide, 5×10-4 M ammonium persulphate and 1×10-4 M sodium bisulfite under 65°C, producing 96.89% of polyacrylamide in 10 minutes. FT-IR, GPC and TEM analysis were carried out to investigate the changes of chemical functional groups and molecular structure during the conversion of acrylamide to polyacrylamide. The weight average molecular weight of the polyacrylamide produced was 1.66 × 106 Da. Vinyl group, which existed in acrylamide FT-IR spectra, disappeared during the conversion of acrylamide into polyacrylamide, and it was replaced by a new alkyl group. The viscosity of aqueous polyacrylamide solution increased with the concentration. Polyacrylamide was observed in linear tree-roots-like structure under TEM viewing.

KW - Optimization

KW - Polyacrylamide

KW - Redox polymerization

KW - Response surface methodology

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