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Degrees of polymerization (DP) and DP distribution of dilute acid-hydrolyzed products of alkali-treated native and regenerated celluloses

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Abstract

Three groups of cellulose II samples, 20% NaOH-treated native celluloses (M-native celluloses), commercial regenerated celluloses and those treated with 20% NaOH (M-regenerated celluloses), were subjected to dilute acid hydrolysis at 105 °C to obtain so-called leveling-off degrees of polymerization (LODP). Molecular mass parameters of the acid-hydrolyzed products were analyzed by SEC-MALLS using 1% LiCl/DMAc as an eluent. The LODP values were in the order of M-native celluloses ≅ M-regenerated celluloses > regenerated celluloses. The LODP values of M-regenerated celluloses are 1.5–1.7 times as much as those of the regenerated celluloses; the cellulose II crystallites in regenerated celluloses increase in size to the longitudinal direction by the alkali treatment and the successive acid hydrolysis at 105 °C. This increase in the longitudinal crystal sizes might primarily occur during acid hydrolysis. All the acid-hydrolyzed products had bimodal SEC elution patterns, i.e. the predominant high-molecular-mass and minor low-molecular-mass components, the latter of which corresponded to DP 20.

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Acknowledgement

This research was supported by a Grand-in-Aid for Scientific Research (Grant number 15658052) from the Japan Society for the Promotion of Science (JSPS). The authors thank Asahi Chemicals Co. Ltd. and Dr. Masahisa Wada for kindly providing Bemliese and Tencel fibers, respectively.

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  1. Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan

    Takuya Isogai, Masahiro Yanagisawa & Akira Isogai

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  1. Takuya Isogai
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  2. Masahiro Yanagisawa
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  3. Akira Isogai
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Correspondence to Akira Isogai.

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Isogai, T., Yanagisawa, M. & Isogai, A. Degrees of polymerization (DP) and DP distribution of dilute acid-hydrolyzed products of alkali-treated native and regenerated celluloses. Cellulose 15, 815–823 (2008). https://doi.org/10.1007/s10570-008-9231-7

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  • DOI: https://doi.org/10.1007/s10570-008-9231-7

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