Journal
NIHON REOROJI GAKKAISHI
Volume 42, Issue 3, Pages 191-196Publisher
SOC RHEOLOGY, JAPAN
DOI: 10.1678/rheology.42.191
Keywords
1-butyl-3-methylimidazolium chloride; 1-ethyl-3-methylimidazolium acetate; Pullulan; Intrinsic viscosity; Mark-Houwink-Sakurada equation
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Intrinsic viscosity [eta] of nine pullulan samples with different molecular weights and narrow molecular weight distributions are obtained in 1-butyl-3-methylimidazolium chloride (BmimC1) 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 M, samples, [eta] in BmimC1 and EmimAc almost coincide with that in aqueous solutions compared at the same M-w. The data at M-w < 30 kg/mol can be represented by M-w(0.5) dependence. The excluded volume effects observed in BmimC1 and EmimAc at higher M, are somewhat stronger than in aqueous solutions. Mark-Houwink-Sakurada equations for pullulan in BmimC1 and EmimAc are determined in 20 kg/mol < M-w < 100 kg/mol. It is conclude that measurement of [eta] by rheometer is a promising method for characterization of polymers in ionic liquids.
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