文摘
Dendritic polymer-modified porous silica particles prepared by a poly(amidoamine)(PAMAM) dendrimer synthesis reaction were characterized by elementary analysis (EA)and size exclusion chromatography (SEC). EA demonstrated the successful alternate growthof dendritic layers on the particles. The phased growth of polymer moieties by cascadereactions filled mesopores on the silica particles and decreased the exclusion limit molecularweight (Mlim) step by step. The density of the dendritic polymer moieties was affected bythe reaction conditions, such as reaction time, temperature, and generation. The mesoporesize on the particles, indicated as Mlim, was controlled by the grafting ratio, which could beadjusted by the reaction conditions. Furthermore, the elution behaviors of SEC standardsamples with a Mw lower than the Mlim were governed by the local microstructure of thedendritic polymer moieties on the silica particles, most notably by polymer density. It wasfound that the local microstructure of the dendritic polymer moieties could also be controlledby the reaction conditions.
