The dependence of measured viscosity on NaCl concentration (0.1 to 3.0M)
pH (range of 2—13) and cadoxen composition w
cad
(from 2% to 100%) for the lacquer polysaccharide in NaCl/cadoxen/H
2
O mixture containing HCl or without were obtained. All the viscosity exponents γin the Mark-Houwink equations under three different solvent condition arc close to 0.5. The w
cad
dependence of reduced viscosity ηsp/c confirms the single strand chain of the polysaccharide. As the γvalues close to 0.5 and values of unperturbed dimension
<
S
2
>
θ
/M and [η] much smaller than those for usual linear polymers
these facts suggest that the polysaccharide chains in the aqueous solutions should be dense random coil owing to the highly branched structure.
Abstract
The dependence of measured viscosity on NaCl concentration (0.1 to 3.0M)
pH (range of 2—13) and cadoxen composition w
cad
(from 2% to 100%) for the lacquer polysaccharide in NaCl/cadoxen/H
2
O mixture containing HCl or without were obtained. All the viscosity exponents γ in the Mark-Houwink equations under three different solvent condition arc close to 0.5. The w
cad
dependence of reduced viscosity ηsp/c confirms the single strand chain of the polysaccharide. As the γ values close to 0.5 and values of unperturbed dimension
<
S
2
>
θ
/M and [η] much smaller than those for usual linear polymers
these facts suggest that the polysaccharide chains in the aqueous solutions should be dense random coil owing to the highly branched structure.
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