title: Magnetic Hydrogels from Alkyne/Cobalt Carbonyl-Functionalized ABA Triblock Copolymers.
abstract: A series of alkyne-functionalized poly(4-(phenylethynyl)styrene)-block-poly(ethylene oxide)-block-poly(4-(phenylethynyl)styrene) (PPES-b-PEO-b-PPES) ABA triblock copolymers was synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization. PESn[Co2(CO)6]x-EO800-PESn[Co2(CO)6]x ABA triblock copolymer/cobalt adducts (10-67 wt % PEO) were subsequently prepared by reaction of the alkyne-functionalized PPES block with Co2(CO)8 and their phase behavior was studied by TEM. Heating triblock copolymer/cobalt carbonyl adducts at 120 °C led to cross-linking of the PPES/Co domains and the formation of magnetic cobalt nanoparticles within the PPES/Co domains. Magnetic hydrogels could be prepared by swelling the PEO domains of the cross-linked materials with water. Swelling tests, rheological studies and actuation tests demonstrated that the water capacity and modulus of the hydrogels were dependent upon the composition of the block copolymer precursors.
authors.affiliation: Department of Chemistry, Stony Brook University , Stony Brook, New York 11794-3400, United States.
authors.forename: Bingyin
authors.initials: B
authors.lastname: Jiang
authors.affiliation: Department of Chemistry, Stony Brook University , Stony Brook, New York 11794-3400, United States.
authors.forename: Wendy L
authors.initials: WL
authors.lastname: Hom
authors.affiliation: Department of Chemistry, Stony Brook University , Stony Brook, New York 11794-3400, United States.
authors.forename: Xianyin
authors.initials: X
authors.lastname: Chen
authors.affiliation: Department of Chemistry, Stony Brook University , Stony Brook, New York 11794-3400, United States.
authors.forename: Pengqing
authors.initials: P
authors.lastname: Yu
authors.affiliation: Department of Chemistry, Stony Brook University , Stony Brook, New York 11794-3400, United States.
authors.forename: Laura C
authors.initials: LC
authors.lastname: Pavelka
authors.affiliation: Center for Functional Nanomaterials, Brookhaven National Laboratory , Upton, New York 11973, United States.
authors.forename: Kim
authors.initials: K
authors.lastname: Kisslinger
authors.affiliation: Department of Chemistry, Stony Brook University , Stony Brook, New York 11794-3400, United States.|Department of Geosciences, Stony Brook University , Stony Brook, New York 11794-2100, United States.
authors.forename: John B
authors.initials: JB
authors.lastname: Parise
authors.affiliation: Department of Chemistry, Stony Brook University , Stony Brook, New York 11794-3400, United States.
authors.forename: Surita R
authors.initials: SR
authors.lastname: Bhatia
authors.affiliation: Department of Chemistry, Stony Brook University , Stony Brook, New York 11794-3400, United States.
authors.forename: Robert B
authors.initials: RB
authors.lastname: Grubbs