Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 328, Issue 1, Pages 81-91Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2008.08.054
Keywords
Silica nanoparticles; Grafting; Maleimide; Epoxide
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Funding
- Intel Technology (M) Sdn. Bhd. [304/PKIMIA/650392/1104, 304/PKIMIA/650336/1104]
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Grafting of free maleimide and epoxide pendant groups onto the surface of similar to 7-nm silica nanoparticles was investigated. Glycidyloxypropyl groups (3-glycidyloxypropyltrimethoxysi lane and 3-aminopropyltrimethoxysilane) that carried epoxide groups and aminopropyl groups were grafted to the silica surface with the help of condensation reactions. Maleimide groups [1,1'-(methylenedi-4,1-phenelene) bismaleimide] were introduced to the silica surface via nucleophilic addition reaction with the aminopropyl groups pre-grafted onto the surface. The grafted silica samples were characterized using CHN, FTIR, DSC, TGA-FTIR, and C-13 and Si-21 CP/MAS NMR spectroscopy. NMR analyses revealed that all the functional groups were covalently bonded to the silica surface and most of the maleimide and epoxide rings remained intact on surface. DSC analysis showed that the epoxide groups were more reactive than the maleimide groups. (C) 2008 Elsevier Inc. All rights reserved.
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