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Resins with "nano-raisins".

S Sinha-Ray¹, Y Zhang, D Placke

¹Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, 842 W. Taylor Street, Chicago, Illinois 60607-7022, USA.

Langmuir : the ACS Journal of Surfaces and Colloids

|February 16, 2010

Summary

Novel polymer materials exhibit temperature-responsive dye release without global swelling. Shrinking nanogel "raisins" increase nanoporosity, enhancing release rates at higher temperatures for advanced applications.

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Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Thermosensitive hydrogels globally change volume with temperature, typically shrinking or swelling above a lower critical solution temperature (LCST).
Conventional hydrogels exhibit bulk volume changes, limiting precise control over stimuli-responsive behavior.

Purpose of the Study:

To introduce a novel class of cross-linked polymeric materials with stimuli-responsive, hydrogel-like behavior without global volume changes.
To investigate the mechanism behind temperature-modulated release of embedded substances in these materials.

Main Methods:

Fabrication of cross-linked polymeric materials containing dispersed nanogel structures.
Characterization using copper staining, transmission electron microscopy (TEM), and energy dispersive X-ray analysis (EDX).

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Assessment of fluorescent dye release kinetics at varying temperatures relative to the LCST.

Main Results:

The materials demonstrate a positive thermosensitive release of an embedded fluorescent dye, significantly influenced by temperature crossing the LCST.
Microscopic analysis revealed nanogel "raisins" within the polymer matrix, which shrink at elevated temperatures.
Nanogel shrinkage was correlated with increased nanoporosity and/or nanocrack formation, facilitating enhanced dye release.

Conclusions:

The observed stimuli-responsive behavior is attributed to the localized shrinkage of embedded nanogels, altering the material's nanoporous structure.
These functional materials offer tunable release kinetics and hold potential for applications in nanofluidics and controlled drug delivery systems.