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Indexed by:Journal Papers

Date of Publication:2015-09-04

Journal:JOURNAL OF CHROMATOGRAPHY A

Included Journals:SCIE、EI、PubMed

Volume:1410

Page Number:110-117

ISSN No.:0021-9673

Key Words:Hybrid monoliths; Methacrylate epoxy cyclosiloxane; POSS; Free-radical polymerization; 2,2-Dimethoxy-2-phenylacetophenone; Photochemical initiation

Abstract:Monolithic poly(methacrylate epoxy cyclosiloxane-co-polyhedral oligomeric silsesquioxanes) (epoxy-MA-PUSS) capillary columns have been prepared via either photo- or thermally-initiated polymerization of the corresponding monomers using a 1-propanol/PEG 400 mixture as porogens. Photochemical polymerization was accomplished by irradiation of the UV-transparent capillary for 10 min at room temperature, while thermal polymerization was performed at 55 degrees C, 60 degrees C or 65 degrees C for 18 h. The evaluation of chromatographic property for two hybrid epoxy-MA-PUSS monoliths was carried out. The results indicate that hybrid monoliths fabricated by photochemical initiation exhibit higher column efficiency (97,000-98,400 plates/m) than those synthesized by thermal polymerization (41,100-48,000 plates/m) in cLC. The higher efficiency of photo-initiated hybrid monoliths is closely related to lower eddy dispersion (A-term) and mass transfer resistance (C-term). (C) 2015 Elsevier B.V. All rights reserved.