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Modification of porous silica particles with poly(acrylic acid)

✍ Scribed by K. Suzuki; S. Siddiqui; C. Chappell; J. A. Siddiqui; R. M. Ottenbrite

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 131 KB
Volume: 11
Category: Article
ISSN: 1042-7147
DOI: 10.1002/(sici)1099-1581(200002)11:2<92::aid-pat941>3.0.co;2-w

No coin nor oath required. For personal study only.

✦ Synopsis

The surface of porous silica particles was modified with poly(acrylic acid) by reacting the carboxyl groups on poly(acrylic acid) with the amino groups of pregrafted aminopropyltriethoxysilane (APS). The chemical modifications by APS and polymer were characterized by infrared spectroscopy and the amount of APS and poly(acrylic acid) grafted to the surface were determined by thermal gravimetric analyses. The wettability of the modified silica particles, based on the rate of water penetration, was pH-dependent with PAA; at pH 1.5 the wettability increased but at pH 5.5 it decreased dramatically. The pore size and size distribution of the silica particles decreased with APS and polymer grafting.

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