Synthesis and LCST behavior of thermally responsive poly(N-isopropylacrylamide)/layered silicate nanocomposites
- Univ. of Illinois, Chicago, IL (United States)
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.
- OSTI ID:
- 522348
- Report Number(s):
- CONF-961202--; ISBN 1-55899-361-4
- Country of Publication:
- United States
- Language:
- English
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