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Assembly and Characterization of Polyelectrolyte Complex Micelles
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Simultaneous thermal analysis of cationic, nonionic and anionic polyacrylamide.

Annett Steudel1, Frank Friedrich1, Wolfgang Lieske1

  • 1Ruhr Universität Bochum (RUB), Chair of Soil Mechanics, Foundation Engineering and Environmental Geotechnics, Universitätsstraße 150, 44780, Bochum, Germany.

Heliyon
|January 1, 2020
PubMed
Summary
This summary is machine-generated.

This study details the thermal decomposition of three polyacrylamide (PAM) types under synthetic air. Unlike previous research under inert gases, this work reveals distinct decomposition products and pathways for cationic, nonionic, and anionic PAM.

Keywords:
Agricultural soil scienceAnalytical chemistryEvolved gas analysisMaterials scienceMineralogyOrganic chemistryPolyacrylamideSoil scienceThermal analysis

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Area of Science:

  • Polymer Science
  • Materials Science
  • Thermal Analysis

Background:

  • Polyacrylamide (PAM) and its derivatives are widely used water-soluble polymers, particularly in clay-polymer composites.
  • Previous thermal decomposition studies of PAM primarily used inert atmospheres (N2, He, Ar).
  • Understanding PAM decomposition under oxidative conditions is crucial for applications involving air exposure.

Purpose of the Study:

  • To investigate the detailed thermal decomposition behavior of cationic (PAM S,τ40Cl), nonionic (PAM° S), and anionic (NaPAM S,τ40) polyacrylamide.
  • To analyze decomposition products and pathways under synthetic air (SynA).
  • To compare the decomposition characteristics across different PAM types.

Main Methods:

  • Thermogravimetry/Differential Scanning Calorimetry (TG/DSC) coupled with Quadrupole Mass Spectrometry (MS).
  • Analysis of gaseous decomposition products (NH3, CH4, NO, H2O, CO2, NO2).
  • Stoichiometric calculations to determine decomposition completeness.

Main Results:

  • Distinct gas release profiles were observed for the three PAM types under SynA.
  • Cationic (PAM S,τ40Cl) and nonionic (PAM° S) polyacrylamide exhibited complete decomposition.
  • Anionic (NaPAM S,τ40) polyacrylamide showed partial decomposition, with sodium remaining as Na2O.
  • Decomposition involved both pyrolysis and oxidation reactions.

Conclusions:

  • The thermal decomposition of polyacrylamides under synthetic air is complex and type-dependent.
  • Oxidative conditions lead to different decomposition products and extents compared to inert atmospheres.
  • The presence of ionic groups (e.g., sodium in NaPAM S,τ40) influences the decomposition pathway and residue formation.