Dynamic viscoelastic properties of dilute pullulan ionic liquids solutions

Research output: Contribution to journalArticle

Abstract

Dynamic viscoelastic properties of standard pullulan samples with different molecular weights and narrow molecular weight distributions in ionic liquids are measured in non-entangled region over a wide range of chain overlapping (1 ≤ C [η ] ≤ 12.6) and compared with Rouse-Zimm (RZ) theory with and without introducing correction term called long time (LT) term, proposed by Osaki et al. (J. Polym. Sci., Part B, Polym. Phys. Ed., 39, 211-217, (2001)). When chains are overlapped (say 2.5 ≤ C [η ]), loss modulus data (G" ) can be well expressed by the RZ theory with experimentally determined longest relaxation time τRZ while storage modulus (G' ) was larger than the calculation. However, addition of LT term made reasonable correction for calculation of G' similar to the results for standard polystyrenes. To apply the RZ fitting for Mw estimation of unknown sample (fitting G" by RZ theory), estimation error for τRZ and resulting Mw are examined. At high C [η ], relative error of estimated Mw was about 15%, as long as t RZ can be determined with small error and coincidence of τ RZ and the longest Rouse relaxation time calculated from estimated Mw is confirmed. At lower C [η ], this method tend to underestimate Mw and the error become larger.

Original languageEnglish
Pages (from-to)133-138
Number of pages6
JournalNihon Reoroji Gakkaishi
Volume45
Issue number3
DOIs
Publication statusPublished - Jan 1 2017

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Ionic Liquids
Ionic liquids
Relaxation time
liquids
molecular weight
relaxation time
Polystyrenes
Molecular weight distribution
Error analysis
Elastic moduli
Molecular weight
polystyrene
pullulan

All Science Journal Classification (ASJC) codes

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

Cite this

Dynamic viscoelastic properties of dilute pullulan ionic liquids solutions. / Hao, Hu; Takahashi, Yoshiaki.

In: Nihon Reoroji Gakkaishi, Vol. 45, No. 3, 01.01.2017, p. 133-138.

Research output: Contribution to journalArticle

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