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HYDRODYNAMIC AND MOLECULAR CHARACTERISTICS OF γ-IRRADIATED PULLULAN

The hydrodynamic properties of γ-irradiated pullulan were studied by viscometry and chromatography. It was shown that, within the studied range of molecular masses (1.4 x 10 4 -2.0 x 10 5 ), the Mark-Kuhn-Houwink equation takes the following form: [η] = (2.19 ± 0.01) x 10 -4 M w 0.62±0.015 . The dependence of the hydrodynamic radius R η of the pullulan molecules upon radiolysis on molecular mass is described by the equation R η = (0.15 ± 0.03) x M w 0.52±0.02 . The Kuhn segment length in an aqueous solution was found to be 17.9 ± 0.5 A. Based on the data obtained, it is concluded that upon radiation modification, the macromolecules of pullulan acquire flexibility.