Viscosity reduction of cellulose + 1-butyl-3-methylimidazolium acetate in the presence of CO2

Masayuki Iguchi, Kazuhiro Kasuya, Yoshiyuki Sato, Taku M. Aida, Masaru Watanabe, Richard L. Smith

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Viscosities of microcrystalline cellulose + 1-butyl-3-methylimidazolium acetate ([bmIm][Ac]) solutions (0. 6-1. 2 wt%) in contact with CO2 were measured at 312 K with a resonant vibrational viscometer. At 4 MPa and 312 K, the CO2 could reduce the viscosity of 1. 2 wt% cellulose + [bmIm][Ac] solution by about 80 %, whereas N2 at the same conditions gave less than a 10 % reduction in viscosity. The viscosity-averaged degree of polymerization and IR spectrum showed that cellulose did not decompose during experiments and that [bmIm][Ac] acted as a non-derivatizing solvent during the dissolution and viscosity reduction process. Further, although CO2 does react with [bmIm][Ac] to form 1-butyl-3-methylimidazolium-2-carboxylate, the reaction seems to be reversible and it does not affect the cellulose. Thus, [bmIm][Ac] with CO2 provides an effective solvent for cellulose and the solvent system can probably be recycled or reused.

Original languageEnglish
Pages (from-to)1353-1367
Number of pages15
Issue number3
Publication statusPublished - 2013 Jun


  • Carbon dioxide
  • Ionic liquid
  • Microcrystalline cellulose
  • Viscosity reduction

ASJC Scopus subject areas

  • Polymers and Plastics


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