title: Heterobifunctional poly(ethylene oxide) oligomers containing carboxylic acids.
abstract: Syntheses of vinylsilyl alcohols having one to three vinyl moieties and their use as initiators for ethylene oxide polymerizations are discussed. Poly(ethylene oxide) oligomers with vinylsilanes at one end and a hydroxyl group at the other were prepared in base-catalyzed reactions. Molecular weights determined from 1H NMR and gel permeation chromatography were close to the targeted values. Carboxylic acid functional poly(ethylene oxide) oligomers were prepared from ene-thiol addition reactions of mercaptoacetic acid across the vinylsilane terminus. It is anticipated that these carboxylic acid functional oligomers will complex to magnetite nanoparticles to afford complexes that can be dispersed in aqueous media.
authors.affiliation: Department of Chemistry and the Macromolecules and Interfaces Institute, Virginia Polytechnic Institute and State University, Mail Code 0212, Blacksburg, Virginia 24061-5976, USA.
authors.forename: M L
authors.initials: ML
authors.lastname: Vadala
authors.forename: M S
authors.initials: MS
authors.lastname: Thompson
authors.forename: M A
authors.initials: MA
authors.lastname: Ashworth
authors.forename: Y
authors.initials: Y
authors.lastname: Lin
authors.forename: T P
authors.initials: TP
authors.lastname: Vadala
authors.forename: R
authors.initials: R
authors.lastname: Ragheb
authors.forename: J S
authors.initials: JS
authors.lastname: Riffle
mesh_terms: D002264:Carboxylic Acids / Q000032:analysis; D002850:Chromatography, Gel; D052203:Ferrosoferric Oxide / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D053768:Metal Nanoparticles / Q000737:chemistry; D008970:Molecular Weight; D011092:Polyethylene Glycols / Q000737:chemistry*; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D012821:Silanes / Q000138:chemical synthesis / Q000737:chemistry*; D014753:Vinyl Compounds / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D002264:Carboxylic Acids; D011108:Polymers; D012821:Silanes; D014753:Vinyl Compounds; C528067:trivinyl(3-chloropropyl)silane; C528069:trivinyl(3-hydroxypropyl)silane; C528068:trivinyl(3-iodopropyl)silane; D011092:Polyethylene Glycols; D052203:Ferrosoferric Oxide