Abstract
Poly(octadecyl acrylate)-grafted silicas were prepared by surface-initiated atom transfer radical polymerization (ATRP). Initially, undecyl ester and allyl ester-based ATRP initiators were synthesized and then immobilized on silica. The surface-initiated ATRP of octadecyl acrylate was carried out from the initiator-grafted silicas using copper(I) bromide and N,N,N′ ,N′,N′′-pentamethyldiethylenetriamine as catalyst precursors to produce poly(octadecyl acrylate)-grafted silicas, Sil-C 11-ODA n (obtained from undecyl ester) and Sil-C 3-ODA n (originated from allyl ester), respectively. Both Sil-C 11-ODA n and Sil-C 3-ODA n were characterized by DRIFT, suspension-state 1H NMR, solid-state 13C CP/MAS NMR spectroscopies, thermogravimetric analysis (TGA), elemental analysis and differential scanning calorimetry (DSC) measurements. Suspension-state 1H NMR, solid-state 13C CP/MAS NMR and DSC analyses suggest that Sil-C 11-ODA n demonstrated more ordered structure than Sil-C 3-ODA n . In this paper, it is also described that for ordering of the polymer phase is accompanied by the selectivity increase for the separation of poly cyclic aromatic hydrocarbons (PAHs) in RP-HPLC.
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