Abstract
The thermodynamic properties of a series of polystyrene samples with different molecular weights (M w was varied from 2.5·103 to 6.57·104) were studied by precision adiabatic vacuum, high-accuracy dynamic, and combustion calorimetry: temperature dependences of the heat capacity in a wide temperature range, thermodynamic characteristics of glass transition and glassy state under standard pressure, and energy of combustion. The thermodynamic functions C ○ p (T), H ○(T) - H ○(0), S ○(T) - S ○(0), and G ○(T) - H ○(0) of polystyrene with different molecular weights, enthalpies of combustion Δc H ○, thermodynamic parameters of formation from simple substances Δf H ○, Δf S ○, and Δf G ○ at T = 298.15 K, and parameters of their synthesis from monomers were calculated from the experimental data. The temperature dependences of the heat capacity for a region of 0–380 K, glass transition temperatures, and thermodynamic characteristics of formation and synthesis of polystyrene depending on its molecular weight were examined.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2251–2257, October, 2013.
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Smirnova, N.N., Kolyakina, E.V., Kulagina, T.G. et al. Influence of the molecular weight of polystyrene on its thermodynamic properties. Russ Chem Bull 62, 2251–2257 (2013). https://doi.org/10.1007/s11172-013-0325-5
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DOI: https://doi.org/10.1007/s11172-013-0325-5