title: Cylindrical micelles of alpha-fluorocarbon-omega-hydrocarbon end-capped poly(N-acylethylene imine)s.
abstract: Micelles of ABC block copolymers with varying degrees of polymerization of the B block (n) and constant lengths of the A and C blocks were investigated by small-angle X-ray scattering (SAXS), analytical ultracentrifugation (AUC), surface tension measurements, and isothermal titration calorimetry. The copolymers consisting of hydrophilic poly(N-acylethylene imine)s, end-capped with a hydrophobic fluorocarbon and a hydrocarbon block, are polymeric surfactants (gamma = 35 mN/m). They form cylindrical micelles with radii of 3.0 nm (n = 35), 3.8 nm (n = 57), and 4.0 nm (n = 72). Their lengths are about 20 nm. The micelles can be doped with 1,4-diiodoperfluorobutane for the polymers with n = 57 and 72 but not for n = 35. We assume that the doped micelles form distinct fluorocarbon domains, which are able to incorporate selectively the fluorocarbon dopant. The work presented here is a contribution to the development of multicompartment micelles.
authors.affiliation: Max Planck Institute of Colloids and Interfaces, MPI KGF Golm 14424 D-Potsdam, Germany.
authors.forename: Stephan
authors.initials: S
authors.lastname: Kubowicz
authors.forename: Andreas F
authors.initials: AF
authors.lastname: Thünemann
authors.forename: Ralf
authors.initials: R
authors.lastname: Weberskirch
authors.forename: Helmuth
authors.initials: H
authors.lastname: Möhwald
mesh_terms: D005466:Fluorocarbons / Q000737:chemistry*; D006838:Hydrocarbons / Q000737:chemistry*; D008823:Micelles; D008968:Molecular Conformation; D011094:Polyethyleneimine / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D012542:Scattering, Radiation; D013499:Surface Properties; D013816:Thermodynamics; D014965:X-Rays
chemical_list: D005466:Fluorocarbons; D006838:Hydrocarbons; D008823:Micelles; D011108:Polymers; D011094:Polyethyleneimine