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Modeling ring/chain equilibrium in nanoconfined sulfur.

Fatema Begum¹, Rakibul H Sarker, Sindee L Simon

¹Department of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409-3121, USA.

The Journal of Physical Chemistry. B

|March 13, 2013

Summary

This summary is machine-generated.

Nanoconfinement significantly impacts sulfur polymerization thermodynamics. Chain length decreases in nanopores due to confinement entropy, altering propagation equilibrium.

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Area of Science:

Polymer Chemistry
Materials Science
Physical Chemistry

Background:

Free radical polymerization of sulfur exhibits complex thermodynamic behavior.
Nanoconfinement effects on polymerization are not fully understood.
Previous models of bulk sulfur polymerization exist.

Purpose of the Study:

To examine the thermodynamics of free radical polymerization of sulfur under nanoconfinement.
To extend existing bulk polymerization models to account for confinement effects.
To quantitatively model the impact of nanopore size on polymerization.

Main Methods:

Extended Tobolsky and Eisenberg's bulk sulfur polymerization model.
Incorporated confinement entropy of polymer chains and rings using literature scaling.
Applied scaling laws for chain entropy with molecular size and nanopore diameter.

Main Results:

The model quantitatively captures experimental data for bulk and nanopore sulfur polymerization.
Confinement entropy scales with molecular size (power of 2) and nanopore diameter (power of -3.0 to -3.8).
The propagation equilibrium constant is dependent on nanopore size and chain length.

Conclusions:

Nanoconfinement significantly reduces the average polymer chain length.
The developed model accurately predicts polymerization behavior in various nanopore sizes.
This work provides insights into the thermodynamics of confined polymerization systems.