Characterization of water-soluble,cationic polyelectrolytes as exemplified by poly(acrylamide-co-trimethylammoniumethylethacryate chloride) and the establishment of structure-property relationships |
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Authors: | Th Griebel W-M Kulicke A Hashemzadeh |
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Institution: | (1) Institut für Technische und Makromolekulare Chemie Universität Hamburg, Bundesstr. 45, 2000 Hamburg 13, FRG;(2) Abteilung CR-C, AKZO Obernburg, Obernburg, FRG |
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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.Abbreviations
a
exponent of the ]-M relationship
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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
constant of the ]-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
-
shear rate/s–1
-
critical shear rate/s–1
-
viscosity/Pa·s
- 0
zero-shear viscosity/Pa·s
- s
solvent viscosity/Pa·s
- sp
specific viscosity
- ]
intrinsic viscosity/cm3·g–1
-
relaxation time/s |
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Keywords: | Poly (acrylamide-co-trimethylammoniumethylmethacrylatechloride) cationicpolyelectrolytes [ ]-M relationship" target="_blank">gif" alt="eegr" align="MIDDLE" BORDER="0">]-M relationship shearviscosity structure-property relationships |
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