Thermogravimetric research of the extruded and native types of starch

Pichkur, V.; Лазаренко, Максим Михайлович; Алєксєєв, Олександр Миколайович; Ковбаса, Володимир Миколайович; Лазаренко, Михайло Васильович

doi:10.15587/1729-4061.2015.33116

Cited by 12 publications

(6 citation statements)

References 8 publications

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“…One can consider that the loss of mass by the sample is caused by the evaporation of water, which is located in the sample in different states [12, 13]. Therefore, the dm / dT was divided on peaks using the Gauss distribution (see Fig.…”

Section: Resultsmentioning

confidence: 99%

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Influence of Water on the Structure and Dielectric Properties of the Microcrystalline and Nano-Cellulose

et al. 2017

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Influence of water in the different states on a structure and dielectric properties of microcrystalline cellulose were studied by of X-ray, thermogravimetry, and dielectric spectroscopy. At research of microcrystalline cellulose (MCC) with different content of water, it is shown that the molecules of water are located in the macropores of MCC and in multimolecular hydrated layers. It is shown that at the increase of concentration of water in a hydrated shell, the reorganization of molecules of cellulose in the surface of crystallites takes place, and as a result, their transversal size and crystallinity increase. It is shown that during the concentration of water, more than 13% in a continuous hydrated shell of crystallites appears. Temperature dependences of actual and imaginary parts of complex dielectric permittivity were studied in the interval of temperatures [−180 ÷ 120] °C on frequencies of f = 5, 10, 20, and 50 kHz. A low-temperature relaxation process and high-temperature transition were observed. Low-temperature relaxation process which is related to transition of surface methylol groups of molecules of cellulose conformation from tg to tt is shifted toward low temperatures at the increase of concentration of water in microcrystalline cellulose.

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Section: Resultsmentioning

confidence: 99%

“…The method for calculation of kinetic parameters of the dehydration process, such as the energy of activation E and pre-exponential factor ( k 0 ) are described in [12]. Kinetic equation of the desorption process may be presented as: …”

Section: Resultsmentioning

confidence: 99%

Influence of Water on the Structure and Dielectric Properties of the Microcrystalline and Nano-Cellulose

et al. 2017

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“…The measurements were made within the temperature range of Т = (20÷250) °C and with the heating rate of 5 °C/min. 6,7 The samples for the dielectric investigation were prepared by pressing MCC powder, under vacuum at 10 -2 mm Hg, at a pressure of 36 MPa, after previously drying this powder at 105 °С during 30 minutes for final removal of moisture. Samples with the diameter of 45 mm and thickness of 0.5 mm were made.…”

Section: Methodsmentioning

confidence: 99%

Nature of Dielectric Relaxation in Microcrystalline Cellulose

Alekseev¹,

Str.²,

Kovalov³

et al. 2019

Cellulose Chem. Technol.

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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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“…Thermogravimetry (TG) is a method of thermal analysis during which a change in mass is registered, depending on temperature. A TG-curve provides information about thermal stability and components of a sample [19]. By using a given method, it is possible to simultaneously measure temperature of the examined sample (T), its mass (TG), rate of change in mass (DTG), and a change in enthalpy (DTA).…”

Section: The Examined Materials and Equipment Used In The Experimentsmentioning

confidence: 99%

Study of the state of moisture in the curd paste with sumach extract and the addition of buckwheat groats

Kochubei-Lytvynenko

Marynin

Yushchenko

et al. 2017

EEJET

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Thermogravimetric research of the extruded and native types of starch

Cited by 12 publications

References 8 publications

Influence of Water on the Structure and Dielectric Properties of the Microcrystalline and Nano-Cellulose

Influence of Water on the Structure and Dielectric Properties of the Microcrystalline and Nano-Cellulose

Nature of Dielectric Relaxation in Microcrystalline Cellulose

Study of the state of moisture in the curd paste with sumach extract and the addition of buckwheat groats

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