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Hydrophobically associating water‐soluble polymers; a dramatic growth of solution viscosity and the specificity of physical gel formation
Author(s) -
Rogovina Lidiya Z.,
Vasil'cv Victor G.,
Churochkitalia A,
Pryakhina Tatiyana I.
Publication year - 2001
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200106)171:1<225::aid-masy225>3.0.co;2-1
Subject(s) - polymer , rheology , polymer chemistry , viscosity , thixotropy , reduced viscosity , chemistry , monomer , methyl methacrylate , surface tension , acrylate , polymerization , chemical engineering , materials science , thermodynamics , organic chemistry , composite material , physics , engineering
The rheological properties of dilute andsemidilute solutions (viscosity) and physical gels(elasticity modulus) of hydrophobically modifiedself‐associated binary polymers (formed by micellarpolymerization of acrylamide and methyl methacrylate with sidehydrophobic groups (HG) containing 9, 12 and 18C‐atoms), and terpolymers (the same monomers and acharged component — sodium acrylate) are studied. Thedependences of properties on the length, form (linear orbranched) and the number of HG and charges is established. It isshown that a very small number of linear HG leads to a considerablyhigher solution viscosity, starting at a smaller concentrationcompared with the effects of a larger number of branched HG. Solutionsof terpolymers of concentration 2–3 wt % form physicalgels that are thixotropic. After dilution, the polymers suddenly formgels at certain concentrations without the preliminary stage ofviscosity growth