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Synthesis of cyanoethyl konjac glucomannan and its liquid crystalline behavior in an ionic liquid

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Abstract

Cyanoethyl konjac glucomannan (CKGM) products with various degree of substitution (DS) were synthesized, and their chemical structure was characterized by infrared spectroscopy and 1H and 13C NMR spectroscopy. Direct evidence of the formation of liquid crystalline phase of cyanoethyl KGM (DS = 2.10) solution in 1-allyl-3-methylimidazolium chloride (AMIMCl), a room temperature ionic liquid, was confirmed by using polarized optical microscopy (POM). The mesophase and anisotropic phase of cyanoethyl KGM solutions and the phase transition boundaries were investigated by steady shear and dynamic sweep measurements. The crystalline state of the cyanoethyl KGM powder and solution were studied by wide X-ray diffraction.

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Acknowledgement

The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (50703031).

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Authors and Affiliations

  1. School of Material Sciences & Engineering, Wuhan University of Technology, Wuhan, 430070, People’s Republic of China

    Chunhui Shen, Wei Li, Ling Zhang, Chao Wan & Shanjun Gao

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  1. Chunhui Shen
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  2. Wei Li
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  3. Ling Zhang
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  4. Chao Wan
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  5. Shanjun Gao
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Correspondence to Shanjun Gao.

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Shen, C., Li, W., Zhang, L. et al. Synthesis of cyanoethyl konjac glucomannan and its liquid crystalline behavior in an ionic liquid. J Polym Res 19, 9758 (2012). https://doi.org/10.1007/s10965-011-9758-4

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