VISCOSITY BEHAVIOR OF LACQUER POLYSACCHARIDE IN AQUEOUS SOLUTION

【摘要】 <正> 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/H₂O 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 <S²>_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.更多还原

【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/H₂O 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 <S²>_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.更多还原