Intrinsic viscosity of pullulan in ionic liquid solutions studied by rheometry

Hao Hu; Akihiko Takada; Yoshiaki Takahashi

doi:10.1678/rheology.42.191

Intrinsic viscosity of pullulan in ionic liquid solutions studied by rheometry

Hao Hu, Akihiko Takada, Yoshiaki Takahashi

Department of Advanced Device Materials

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

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 M_w samples, [η] in BmimCl 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 BmimCl and EmimAc at higher M^w are somewhat stronger than in aqueous solutions. Mark-Houwink-Sakurada equations for pullulan in BmimCl and EmimAc are determined in 20 kg/mol < M_w < 100 kg/mol. It is conclude that measurement of [η] by rheometer is a promising method for characterization of polymers in ionic liquids.

Original language	English
Pages (from-to)	191-196
Number of pages	6
Journal	Nihon Reoroji Gakkaishi
Volume	42
Issue number	3
DOIs	https://doi.org/10.1678/rheology.42.191
Publication status	Published - 2014

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1678/rheology.42.191

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title = "Intrinsic viscosity of pullulan in ionic liquid solutions studied by rheometry",

abstract = "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 Mw 0.5 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.",

author = "Hao Hu and Akihiko Takada and Yoshiaki Takahashi",

year = "2014",

doi = "10.1678/rheology.42.191",

language = "English",

volume = "42",

pages = "191--196",

journal = "Nihon Reoroji Gakkaishi",

issn = "0387-1533",

publisher = "Society of Rheology",

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T1 - Intrinsic viscosity of pullulan in ionic liquid solutions studied by rheometry

AU - Hu, Hao

AU - Takada, Akihiko

AU - Takahashi, Yoshiaki

PY - 2014

Y1 - 2014

N2 - 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 Mw 0.5 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.

AB - 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 Mw 0.5 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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Intrinsic viscosity of pullulan in ionic liquid solutions studied by rheometry

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