Viscosity Behavior of Lacquer Polysaccharide in Aqueous Solution

The dependence of measured visosity on NaCl concentration (0.1 to 3.0 M),pH(range of 2 -13)and cadoxen composition Wcad (from 2% to 10%)for the laquer polysaccharide in NaCl / cadoxen / H2O mixture containing HCl or without were obtained.All the viscosity exponents γin the Mark-Houwink equations under three different solvent condition are close to 0.5.The Wcad dependence of reduced viscosity πsp/c confirms the single sttand chain of the polysaccharide.As the γvalues close to 0.5 and values of unperturbed dimensionθ/M and ［π］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 baranched structure.