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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

REFERENCES

1. Giannelis, E.P., Adv. Mater., 8, 229(1996).Google Scholar
2. Usuki, A., et al., J. Mater. Res. 8, 1179(1993).Google Scholar
3. Yano, K., et al., J. Polym. Sci. Part A: Polym. Chem., 31, 2493(1993).Google Scholar
4. Messersmith, P.B. and Giannelis, E. P., Chem. Mater., 6, 1719(1994).Google Scholar
5. Lan, T., Pinnavaia, T.J., Chem. Mater. 6, 2216(1994).Google Scholar
6. Messersmith, P.B. and Giannelis, E.P, J. Polym. Sci. Part A: Polym. Chem., 33, 1047(1995).Google Scholar
7. Shi, H., Lan, T., Pinnavaia, T.J., Chem. Mater. 8, 1584(1996).Google Scholar
8. Schild, H.G., Prog. Polym. Sci., 17, 163(1992).Google Scholar
9. Hoffman, A.S., Afrassiabi, A., Dong, L.C., J. Controlled Release, 4, 213(1986).Google Scholar
10. Okuyama, Y., et al., J. Biomater. Sci. Polymer Edn., 4, 545(1993).Google Scholar
Hu, U.Z., Zhang, X., Li, Y., Science, 269, 525(1995).Google Scholar