Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 227, Issue 2, Pages 408-411Publisher
ACADEMIC PRESS INC
DOI: 10.1006/jcis.2000.6871
Keywords
colloidal silica; poly(N-isopropylacrylamide); temperature-sensitive; colloid stability
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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 degrees C. The resulting particles had a critical coagulation concentration of calcium chloride of 500 mM I at room temperature, indicating robust colloidal stability. By contrast, heating the suspension to 50 degrees 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 degrees C is 15% higher than the corresponding value for PNIPAM solutions. (C) 2000 Academic Press.
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