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Molecular Weight of Step-Growth Polymers

Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...

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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

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Published on: September 26, 2016

Constant pH simulations of pH responsive polymers.

Arjun Sharma¹, J D Smith¹, Keisha B Walters²

¹Department of Chemistry, University of New Orleans, New Orleans, Louisiana 70148, USA.

The Journal of Chemical Physics

|December 25, 2016

Summary

This summary is machine-generated.

Polyacidic polymers exhibit distinct local and global structural changes in response to pH. Polymer tacticity influences these changes, revealing both positive and negative cooperativities in poly(methacrylic acid).

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Area of Science:

Polymer Chemistry
Physical Chemistry
Computational Chemistry

Background:

Polyacidic polymers undergo structural transitions driven by hydrophobic and electrostatic forces.
Understanding these pH-dependent changes is crucial for polymer science and applications.

Purpose of the Study:

To investigate the structural response of poly(methacrylic acid) to pH variations.
To elucidate the relationship between polymer tacticity and structural changes.

Main Methods:

Constant pH molecular dynamics computer simulations were employed.
Analysis focused on local and global structural rearrangements.

Main Results:

Two distinct types of structural changes were identified: local and global.
The local structural response is dependent on polymer tacticity.
Different stereochemistries exhibited varied cooperative effects, including positive and negative cooperativities.

Conclusions:

The tacticity of poly(methacrylic acid) significantly influences its pH-responsive behavior.
Local structural changes driven by tacticity play a key role in the polymer's overall response.