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TVT, 2019, Volume 57, Issue 5, Pages 670–676 (Mi tvt11192)  

Thermophysical Properties of Materials

Effect of temperature on the conformation changes of structural and thermophysical characteristics in composite cellulose-acetate films

S. I. Lazarev, Yu. M. Golovin, S. V. Kovalev, D. S. Lazarev

Tambov State Technical University

Abstract: The effect of temperature on the conformation changes of the structural and the thermophysical characteristics in the UAM-50, UAM-100, and MGA-95 composite films of cellulose acetate are studied. An interphase layer appears at the phase interface in the UAM-50 and the UAM-100 samples according to the data of differential scanning calorimetry. An exothermic effect appears in the calorimetry data curves for water-saturated samples in the temperature range of $\Delta T = 125$$226^{\circ}$C with $\Delta H = 20.7$ kJ/kg for the UAM-50 and $27.95$ kJ/kg for the UAM-100; this indicates hydration of the polar groups of cellulose acetate and polyamide in the interphase layer of the composite films. When composite films in the air-dried and the water saturated samples were studied with differential scanning, there was a redistribution of the ratio between the quantities of perfect crystalline structures in crystallites with different melting enthalpies. The melting enthalpy decreases from $6.06$ to $0.99$ kJ/kg for the MGA-95 low-temperature phase, from $1.99$ to $1.72$ kJ/kg for the high-temperature phase; from $3.04$ to $1.38$ kJ/kg for the UAM-50 low-temperature phase, from $8.12$ to $1.76$ kJ/kg for the high-temperature phase; from 4.99 to 1.5 kJ/kg for the UAM-100 low-temperature phase, and from $2.33$ to $0.77$ kJ/kg for the high-temperature phase. The total melting enthalpy of the endothermic peaks also decreases for all three samples; this is an indication of decreased crystallinity in the water saturated samples of the composite films.

DOI: https://doi.org/10.1134/S0040364419050090

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English version:
High Temperature, 2019, 57:5, 641–647

UDC: 538.975
Received: 22.02.2019
Revised: 22.02.2019
Accepted:16.05.2019

Citation: S. I. Lazarev, Yu. M. Golovin, S. V. Kovalev, D. S. Lazarev, “Effect of temperature on the conformation changes of structural and thermophysical characteristics in composite cellulose-acetate films”, TVT, 57:5 (2019), 670–676; High Temperature, 57:5 (2019), 641–647

Citation in format AMSBIB
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\by S. I. Lazarev, Yu. M. Golovin, S. V. Kovalev, D. S. Lazarev
\paper Effect of temperature on the conformation changes of structural and thermophysical characteristics in composite cellulose-acetate films
\jour TVT
\yr 2019
\vol 57
\issue 5
\pages 670--676
\mathnet{http://mi.mathnet.ru/tvt11192}
\crossref{https://doi.org/10.1134/S0040364419050090}
\elib{http://elibrary.ru/item.asp?id=39324210}
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\jour High Temperature
\yr 2019
\vol 57
\issue 5
\pages 641--647
\crossref{https://doi.org/10.1134/S0018151X19050092}
\scopus{http://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-85076515873}


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