NATURE OF DIELECTRIC RELAXATION IN MICROCRYSTALLINE CELLULOSE

Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Str., Kyiv 01601, Ukraine; OLEXANDER M. ALEKSEEV; KOSTIANTYN M. KOVALOV; Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Str., Kyiv 01601, Ukraine; MAXIM M. LAZARENKO; Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Str., Kyiv 01601, Ukraine; MYKHAILO V. LAZARENKO; National University of Food Technologies, 68, Volodymyrska Str., Kyiv 01601, Ukraine; YURII E. GRABOVSKII; Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Str., Kyiv 01601, Ukraine; SERGII YU. TKACHOV; Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Str., Kyiv 01601, Ukraine

doi:10.35812/cellulosechemtechnol.2019.53.02

journal article·2019-02-28Open access

NATURE OF DIELECTRIC RELAXATION IN MICROCRYSTALLINE CELLULOSE

Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Str., Kyiv 01601, Ukraine, OLEXANDER M. ALEKSEEV, KOSTIANTYN M. KOVALOV, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Str., Kyiv 01601, Ukraine, MAXIM M. LAZARENKO, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Str., Kyiv 01601, Ukraine, MYKHAILO V. LAZARENKO, National University of Food Technologies, 68, Volodymyrska Str., Kyiv 01601, Ukraine, YURII E. GRABOVSKII, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Str., Kyiv 01601, Ukraine, SERGII YU. TKACHOV, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Str., Kyiv 01601, Ukraine

Cellulose Chemistry and Technology· Volume 53· Issue 1-2

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Source abstract

Abstract

This article is devoted to the investigation of microcrystalline cellulose (MCC). X-ray diffraction analysis allowed estimating the radius of microcrystalline cellulose particles (whiskers), while the dielectric spectroscopy method gave an insight into the mean-square change of the dipole moment per unit volume and the concentration of relaxers as a result. The moisture content of the MCC samples was estimated using thermogravimetric analysis. According to the experimentally obtained data, we propose a model to describe the dipole relaxation in MCC as being caused by reorientation of hydroxymethyl groups only on the surface of a microcrystalline cellulose particle.

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Research context

OpenAlex topics: Advanced Cellulose Research Studies · Aerogels and thermal insulation · High voltage insulation and dielectric phenomena

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