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Synthesis and Lcst Behavior of Thermally Responsive Poly(N-Isopropylacrylamide)/Layered Silicate Nanocomposites

Published online by Cambridge University Press:  10 February 2011

Phillip B. Messersmith  and
F. Znidarsich
Phillip B. Messersmith
Affiliation:
Departments of Restorative Dentistry and Bioengineering, University of Illinois at Chicago, 801 S. Paulina St., Chicago, IL 60612.
F. Znidarsich
Affiliation:
Departments of Restorative Dentistry and Bioengineering, University of Illinois at Chicago, 801 S. Paulina St., Chicago, IL 60612.
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Abstract

Stimuli responsive polymeric hydrogel composites were synthesized by room temperature copolymerization of N-isopropyl acrylamide and methylene bisacrylamide (crosslinking monomer) in an aqueous suspension of Na-montmorillonite. Hydrogels containing 3.5 weight % of montmorillonite exhibited a lower critical solution temperature (LCST) similar to unmodified PNIPAM hydrogel (approximately 32°C), and underwent a reversible 60–70% volume shrinkage when heated from ambient temperature to above the LCST. However, hydrogels containing 10 weight% montmorillonite did not exhibit a measurable LCST, and underwent considerably less shrinkage when heated. A solvent exchange reaction was used to replace the water with an acrylic monomer, which was polymerized in-situ to create a delaminated montmorillonite/polymer nanocomposite.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 457: Symposium V – Nanophase and Nanocomposite Materials II , 1996 , 507
Copyright
Copyright © Materials Research Society 1997

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References

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