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Home  >  Journal list  >  Polymer Journal  >  Vol.41  No.9 (2009)  >  pp.771-777

Polymer Journal
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Preparation and Characterization of Micrometer-Sized Poly(N-isopropylacrylamide) Hydrogel Particles

Hidenobu Shimizu1), Risei Wada1) and Masaru Okabe1)
1) Department of Applied Bioscience, Faculty of Applied Bioscience, Kanagawa Institute of Technology

ABSTRACT:  The present study deals with preparation and swelling properties of micrometer-sized poly(N-isopropylacrylamide) (PNIPAM) hydrogel particles. Aqueous precipitation polymerization of NIPAM with N,N′-methylenebisacrylamide (MBAAm) was performed with varying electrolyte concentrations in the polymerization media. Sodium chloride was used as an electrolyte. According to the particle size analysis by transmission electron microscope, the particle size increased in the range of 0.55 to 1.60 μm with an increase in the electrolyte concentration up to 1.6 wt %. The concentration is based on the NIPAM monomer weight. Dynamic light scattering data showed that swelling ratio of PNIPAM hydrogel particles in water varied from 10 to 40 as the electrolyte concentration at particle preparation increased from 0 to 1.6 wt %. Time-course analysis of particle size showed that an increase in particle size would be caused by aggregation of smaller particles. In conclusion, micrometer-sized PNIPAM particles with high swelling capacity can be obtained by the addition of an electrolyte in polymerization media.

Poly(N-isopropylacrylamide)/ Thermosensitive Particle/ Precipitation Polymerization/ Hydrogel/ Volume Phase Transition

Published online: September 15, 2009
© Copyright, 2009 by The Society of Polymer Science, Japan

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