Abstract
The thermodynamic properties of a series of polystyrene samples with different molecular weights (Mw 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 ΔcH○, thermodynamic parameters of formation from simple substances ΔfH○, ΔfS○, and ΔfG○ 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.
Published Version
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