title: Surface modification of nanoporous 1,2-polybutadiene by atom transfer radical polymerization or click chemistry.
abstract: Surface-initiated atom transfer radical polymerization (ATRP) and click chemistry were used to obtain functional nanoporous polymers based on nanoporous 1,2-polybutadiene (PB) with gyroid morphology. The ATRP monolith initiator was prepared by immobilizing bromoester initiators onto the pore walls through two different methodologies: (1) three-step chemical conversion of double bonds of PB into bromoisobutyrate, and (2) photochemical functionalization of PB with bromoisobutyrate groups. Azide functional groups were attached onto the pore walls before click reaction with alkynated MPEG. Following ATRP-grafting of hydrophilic polyacrylates and click of MPEG, the originally hydrophobic samples transformed into hydrophilic nanoporous materials. The successful modification was confirmed by infrared spectroscopy, contact angle measurements and measurements of spontaneous water uptake, while the morphology was investigated by small-angle X-ray scattering and transmission electron microscopy.
authors.affiliation: Danish Polymer Centre, Department of Chemical and Biochemical Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
authors.forename: Fengxiao
authors.initials: F
authors.lastname: Guo
authors.forename: Katja
authors.initials: K
authors.lastname: Jankova
authors.forename: Lars
authors.initials: L
authors.lastname: Schulte
authors.forename: Martin E
authors.initials: ME
authors.lastname: Vigild
authors.forename: Sokol
authors.initials: S
authors.lastname: Ndoni