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Molecular weight between entanglements for linear d-glucans

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Abstract

Dynamic viscoelasticity measurements were carried out for concentrated solutions of linear d-glucans in BmimCl to examine the effect of the linkage between repeating units of glucose on the rheological properties. The values of molecular weight between entanglements (M e) were determined for four d-glucans: curdlan, pullulan, cellulose, and amylose. From the concentration dependence of M e, the value of M e in the molten state (M e,melt) for each d-glucan was estimated as a material constant. The order of M e,melt became cellulose < pullulan < curdlan < amylose, indicating that the linkage is actually influential in M e,melt for the linear d-glucans. The relationship between M e,melt and the molecular structure of the d-glucans were discussed assuming that the values of M e,melt for the d-glucans primarily reflect the chain stiffness such as the characteristic ratio C ∞ on the analogy of synthetic polymers. Although the trend was not so clear, it was shown that N unit is a decreasing function of C ∞ .

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Authors and Affiliations

  1. Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo, Kyoto, 615-8510, Japan

    Jun-ichi Horinaka, Atsushi Okuda, Ryosuke Yasuda & Toshikazu Takigawa

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  1. Jun-ichi Horinaka
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  2. Atsushi Okuda
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  3. Ryosuke Yasuda
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  4. Toshikazu Takigawa
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Correspondence to Jun-ichi Horinaka.

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Horinaka, Ji., Okuda, A., Yasuda, R. et al. Molecular weight between entanglements for linear d-glucans. Colloid Polym Sci 290, 1793–1797 (2012). https://doi.org/10.1007/s00396-012-2728-5

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  • DOI: https://doi.org/10.1007/s00396-012-2728-5

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