The temperature dependence of the molar heat capacity of porous vinylbenzyl chloride and divinylbenzene copolymer was studied using a precise automated adiabatic calorimeter and a differential scanning calorimeter in the range 6.24–496.5 K. On the basis of the obtained experimental data, three anomalous changes in heat capacity were detected in the above temperature range, caused by the glass transition of the copolymer (T = 367–388 K and T = 420–460 K) and desorption of the heat-conducting gas – helium (T = 6–9 K). The standard thermodynamic functions <InlineEquation ID="IEq1"> <EquationSource Format="TEX">${C}_\text{p}^\text{o}$</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mi>C</mi> <mtext>p</mtext> <mtext>o</mtext> </msubsup> </math></EquationSource> </InlineEquation>(T), <InlineEquation ID="IEq2"> <EquationSource Format="TEX">${H}^\text{o}\left(T\right)-{H}^\text{o}\left(0\right)$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msup> <mrow> <mi>H</mi> </mrow> <mtext>o</mtext> </msup> <mfenced close=")" open="("> <mi>T</mi> </mfenced> <mo>-</mo> <msup> <mrow> <mi>H</mi> </mrow> <mtext>o</mtext> </msup> <mfenced close=")" open="("> <mn>0</mn> </mfenced> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq3"> <EquationSource Format="TEX">${S}^\text{o}\left(T\right)-{S}^\text{o}\left(0\right)$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msup> <mrow> <mi>S</mi> </mrow> <mtext>o</mtext> </msup> <mfenced close=")" open="("> <mi>T</mi> </mfenced> <mo>-</mo> <msup> <mrow> <mi>S</mi> </mrow> <mtext>o</mtext> </msup> <mfenced close=")" open="("> <mn>0</mn> </mfenced> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq4"> <EquationSource Format="TEX">${G}^\text{o}\left(T\right){-G}^\text{o}\left(0\right)$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msup> <mrow> <mi>G</mi> </mrow> <mtext>o</mtext> </msup> <mfenced close=")" open="("> <mi>T</mi> </mfenced> <msup> <mrow> <mo>-</mo> <mi>G</mi> </mrow> <mtext>o</mtext> </msup> <mfenced close=")" open="("> <mn>0</mn> </mfenced> </mrow> </math></EquationSource> </InlineEquation> in the range from T → 0 to 490 K, as well as the standard entropy of copolymer formation at T = 298.15 K were calculated from the obtained experimental data.

Thermodynamic properties of vinylbenzyl chloride and divinylbenzene copolymer

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2026年4月1日

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Nataliia V. Abarbanel,
Dmitriy M. Zarubin,
Natalia N. Smirnova,
Alexey V. Markin,
Artyom N. Markov,
Egor S. Dokin,
Ekaterina A. Stepanova,
Andrey V. Vorotyntsev,
Anton N. Petukhov

摘要

The temperature dependence of the molar heat capacity of porous vinylbenzyl chloride and divinylbenzene copolymer was studied using a precise automated adiabatic calorimeter and a differential scanning calorimeter in the range 6.24–496.5 K. On the basis of the obtained experimental data, three anomalous changes in heat capacity were detected in the above temperature range, caused by the glass transition of the copolymer (T = 367–388 K and T = 420–460 K) and desorption of the heat-conducting gas – helium (T = 6–9 K). The standard thermodynamic functions ${C}_\text{p}^\text{o}$ $C_{p}^{o}$ (T), ${H}^\text{o}\left(T\right)-{H}^\text{o}\left(0\right)$ $H^{o} (T) - H^{o} (0)$ , ${S}^\text{o}\left(T\right)-{S}^\text{o}\left(0\right)$ $S^{o} (T) - S^{o} (0)$ , ${G}^\text{o}\left(T\right){-G}^\text{o}\left(0\right)$ $G^{o} (T) {- G}^{o} (0)$ in the range from T → 0 to 490 K, as well as the standard entropy of copolymer formation at T = 298.15 K were calculated from the obtained experimental data.