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Properties of Poly(N-isopropylacrylamide)-Grafted Colloidal Silica

✍ Scribed by Jun Liu; Robert Pelton; Andrew N. Hrymak

Book ID: 102582346
Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 96 KB
Volume: 227
Category: Article
ISSN: 0021-9797
DOI: 10.1006/jcis.2000.6871

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✦ Synopsis

Poly(N-isopropylacrylamide-co-3-trimethoxysilylpropyl methacrylate) was prepared by radical polymerization and was grafted onto the surface of spherical colloidal silica. The copolymer, which had on average 1 silyl group per chain, condensed on the silica dispersed in THF at 60 • C. The resulting particles had a critical coagulation concentration of calcium chloride of 500 mM at room temperature, indicating robust colloidal stability. By contrast, heating the suspension to 50 • C lowered the critical coagulation concentration by more than three orders of magnitude, giving a value of 0.1 mM. Thus, the PNIPAM shell induced temperature-sensitive colloidal stability in the silica dispersion. The coated silica particles were also surface active. However, the surface tension of 50 mJ/m 2 at 25 • C is 15% higher than the corresponding value for PNIPAM solutions.

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