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Determination of Molar Masses of Polymers I

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Polymerization produces macromolecules with a range of chain lengths due to the random nature of molecular growth processes. As chains form and terminate at different stages, a single polymer sample contains molecules of varying sizes rather than a uniform structure. This variability is described using average molar masses and distribution-related parameters, which together provide a comprehensive understanding of polymer characteristics.The distribution of molar masses plays a critical role in...

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Related Experiment Video

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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

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Published on: June 20, 2019

Nucleation in polydisperse polymer mixtures.

Shuanhu Qi¹, Dadong Yan

¹Beijing National Laboratory for Molecular Sciences (BNLMS), Joint Laboratory of Polymer Science and Materials Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.

The Journal of Chemical Physics

|December 3, 2008

Summary

This summary is machine-generated.

Polydispersity significantly impacts polymer nucleation, altering critical nucleus properties and broadening interfaces. Longer polymer chains in polydisperse mixtures increase nucleation tendency, affecting phase separation dynamics.

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Area of Science:

Polymer Science
Physical Chemistry
Materials Science

Background:

Understanding nucleation in polymer mixtures is crucial for controlling material properties.
Polydispersity, the distribution of molecular weights, is a common feature of synthetic polymers.
The influence of polydispersity on nucleation kinetics and thermodynamics is not fully understood.

Purpose of the Study:

To investigate the effect of polydispersity on nucleation in a metastable polymer mixture.
To analyze how the chain length distribution of polymer A influences the critical nucleus properties.
To examine the changes in interfacial properties due to polydispersity.

Main Methods:

Utilizing self-consistent field theory (SCFT) to model the nucleation process.
Employing the continuous Schulz chain length distribution to represent polydispersity in polymer A.
Analyzing the free energy barrier, nucleus composition, and interfacial width.

Main Results:

The free energy barrier for nucleation is sensitive to polydispersity, particularly in highly polydisperse systems.
Longer polymer chains exhibit a stronger tendency towards nucleation, altering nucleus composition.
The distribution of volume fraction within the nucleus differs from the bulk, with longer chains dominating.
The interface between the critical nucleus and the bulk phase broadens significantly with increasing polydispersity.

Conclusions:

Polydispersity plays a critical role in polymer nucleation, affecting both kinetics and thermodynamics.
The tendency of longer chains to nucleate leads to distinct compositional profiles in the nucleus.
Broadened interfaces in highly polydisperse systems have implications for phase separation and material morphology.