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An Injectable and Drug-loaded Supramolecular Hydrogel for Local Catheter Injection into the Pig Heart

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A generalized model for swelling-controlled release systems.

S K Singh¹, L T Fan

¹Department of Chemical Engineering Durland Hall Kansas State University Manhattan, Kansas 66506.

Biotechnology Progress

|June 23, 2010

Summary

This summary is machine-generated.

A new model simulates active agent and organic penetrant transport in glassy polymers. It accounts for polymer swelling, chain relaxation, and stress-induced movement, improving understanding of diffusion dynamics.

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Area of Science:

Polymer Science
Materials Science
Chemical Engineering

Background:

Understanding simultaneous transport of multiple species in polymers is crucial for material design.
Glassy polymers exhibit complex behaviors like swelling and chain relaxation upon penetrant absorption.
Existing models may not fully capture the interplay between diffusion, swelling, and polymer dynamics.

Purpose of the Study:

To develop a generalized phenomenological model for simultaneous transport of an active agent and an organic penetrant in a glassy polymer matrix.
To incorporate macromolecular chain relaxation and volume expansion effects into the transport model.
To account for convective transport driven by volume expansion and stress gradients.

Main Methods:

Developed a generalized model for simultaneous transport.
Incorporated macromolecular chain relaxation and volume expansion.
Included a stress-induced drift velocity term (case-II velocity) to characterize swelling.
Accounted for convective transport due to volume expansion and stress gradients.

Main Results:

The model describes the simultaneous diffusion of an active agent and an organic penetrant.
It captures the influence of polymer chain relaxation and volume expansion on active agent release.
The model integrates swelling behavior via a case-II velocity term.
It considers convective transport induced by both volume expansion and stress gradients.

Conclusions:

The developed model provides a comprehensive framework for analyzing simultaneous transport in glassy polymers.
It highlights the importance of considering polymer dynamics (relaxation, swelling) in transport phenomena.
The model's flexibility allows it to reduce to special cases, applicable to various polymer-penetrant systems.