Intrinsic Viscosity of Pullulan in Ionic Liquid Solutions Studied by Rheometry

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  • Hu Hao
    Department of Molecular & Material Sciences, IGSES, Kyushu University
  • Takada Akihiko
    Department of Molecular & Material Sciences, IGSES, Kyushu University Institute for Materials Chemistry and Engineering, Kyushu University
  • Takahashi Yoshiaki
    Department of Molecular & Material Sciences, IGSES, Kyushu University Institute for Materials Chemistry and Engineering, Kyushu University

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Intrinsic viscosity [η] of nine pullulan samples with different molecular weights and narrow molecular weight distributions are obtained in 1-butyl-3-methylimidazolium chloride (BmimCl) and 1-ethyl-3-methylimidazolium acetate (EmimAc) from the Newtonian viscosities measured by oscillatory and steady shear flow in conventional rheometer for dilute solutions. For low molecular weight Mw samples, [η] in BmimCl and EmimAc almost coincide with that in aqueous solutions compared at the same Mw. The data at Mw < 30 kg/mol can be represented by Mw0.5 dependence. The excluded volume effects observed in BmimCl and EmimAc at higher Mw are somewhat stronger than in aqueous solutions. Mark-Houwink-Sakurada equations for pullulan in BmimCl and EmimAc are determined in 20 kg/mol < Mw < 100 kg/mol. It is conclude that measurement of [η] by rheometer is a promising method for characterization of polymers in ionic liquids.

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