Abstract
The cationic copolymerization products of poly (acrylamide-co-trimethylammoniumethylmethacrylate chloride (PTMAC) having cationic monomer percentages of 8%, 25%, and 50% as well as the cationic homopolymer, were characterized with respect to their molecular dimensions. The light-scattering and viscometric measurements were carried out for molecular weights ranging from 200 000 to 12 800 000 g/mol in 1 M NaCl solution at 25°C. It was possible to establish a relationship between the molecular weight and the two parameters: intrinsic viscosity and radius of gyration, for all four polymers.
Rheological investigations of the flow properties in 1 M NaCl solution were also carried out using the polymer with a cationic monomer of 50% (PTMAC 50). Structure-property relationships were formulated which made it possible to describe and predict the shear viscosity, both in the zero-shear region (Newtonian region) and in the shear-dependent region (non-Newtonian region) as a function of the polymer concentration, the molecular weight, and shear rate.
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Abbreviations
- a :
-
exponent of the [η]-M relationship
- A 2 :
-
2nd virial coefficient/mol·cm3·g−2
- AAm:
-
acrylamide
- b :
-
slope of the flow-curve in the shear-rate dependent region
- c :
-
concentration/g·cm−3
- dn/dc:
-
refractive index increment/cm3·g−1
- f :
-
function
- K η :
-
constant of the [η]-M relationship/cm3·gt-1
- m c :
-
proportion of cationic monomers/mol %
- M :
-
molecular weight/g·mol−1
- M w :
-
weight-average molecular weight/g·mol−1
- M n :
-
number-average molecular weight/g·mol−1
- NaCL:
-
sodium chloride
- PAAm:
-
polyacrylamide
- PS:
-
polystyrene
- PTMAC:
-
poly(acrylamide-co-trimethylammoniumethylme thacrylate chloride)
- 〈RG 2〉0.5 :
-
radius of gyration/nm
- TMAC:
-
trimethylammoniumethylmethacrylate chloride
- \(\dot \gamma \) :
-
shear rate/s−1
- \(\dot \gamma _{{\text{cr}}} \) :
-
critical shear rate/s−1
- η:
-
viscosity/Pa·s
- η0:
-
zero-shear viscosity/Pa·s
- ηs :
-
solvent viscosity/Pa·s
- ηsp :
-
specific viscosity
- [η]:
-
intrinsic viscosity/cm3·g−1
- τ:
-
relaxation time/s
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Griebel, T., Kulicke, WM. & Hashemzadeh, A. Characterization of water-soluble, cationic polyelectrolytes as exemplified by poly(acrylamide-co-trimethylammoniumethylethacryate chloride) and the establishment of structure-property relationships. Colloid Polym Sci 269, 113–120 (1991). https://doi.org/10.1007/BF00660299
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DOI: https://doi.org/10.1007/BF00660299