Entropy production during reversible polymerization in nonideal systems.

Area of Science:

• Physical Chemistry
• Polymer Science
• Chemical Thermodynamics

Background:

• Polymerization processes in closed systems can exhibit non-equilibrium behavior.
• Understanding entropy production is crucial for characterizing the dynamics of chemical reactions.
• Non-ideal molecular interactions influence system thermodynamics.

Purpose of the Study:

• To develop a general method for calculating time-dependent entropy production during reversible polymerization.
• To investigate the impact of non-ideal polymer behavior on entropy production dynamics.
• To analyze how activity coefficients affect the course of entropy production.

Main Methods:

• Application of classical Flory-Huggins theory to model non-ideal polymer solutions.
• Derivation of explicit expressions for activity coefficients.
• Calculation of time-dependent entropy production for two distinct polymerization scenarios.

Main Results:

• Entropy production (sigma) was explicitly calculated as a function of time (t).
• The system transitions from a non-equilibrium state towards equilibrium, with sigma approaching zero over time.
• Non-ideal behavior, specifically the activity coefficient, significantly influences the curvature of sigma, deviating from ideal behavior.

Conclusions:

• The study provides a framework for calculating entropy production in non-ideal polymerization systems.
• Non-ideal interactions play a critical role in the thermodynamic trajectory of polymerization.
• The findings highlight the importance of considering molecular interactions for accurate thermodynamic modeling.