title: Structure of micelles of a nonionic block copolymer determined by SANS and SAXS.
abstract: The micellar state of Pluronic P123, which is a poly(ethylene oxide)-b-poly(propylene oxide)-b- poly(ethylene oxide) block polymer (EO(20)PO(70)EO(20)), has been investigated using SANS, SAXS, and differential scanning calorimetry under the conditions utilized in the synthesis of ordered mesoporous materials, such as SBA-15. The absolute intensity measurements, both with SANS and SAXS, have provided a detailed quantitative description of the P123 micelles in the framework of a simple core-shell spherical model. The model developed has been used to establish the structure of the copolymer micelles, including their size, shape, aggregation number and detailed composition, as well as the structural changes induced by varying reaction conditions. The effects of temperature, pH, acidic source and the addition of swelling agents (toluene and TMB) are reported and discussed.
authors.affiliation: Laboratoire de Physique de Solides, UMR 8502, Bât. 510, Université Paris-Sud, F-91405 Orsay, France.
authors.forename: Sabine
authors.initials: S
authors.lastname: Manet
authors.forename: Amélie
authors.initials: A
authors.lastname: Lecchi
authors.forename: Marianne
authors.initials: M
authors.lastname: Impéror-Clerc
authors.forename: Vladimir
authors.initials: V
authors.lastname: Zholobenko
authors.forename: Dominique
authors.initials: D
authors.lastname: Durand
authors.forename: Cristiano L P
authors.initials: CL
authors.lastname: Oliveira
authors.forename: Jan Skov
authors.initials: JS
authors.lastname: Pedersen
authors.forename: Isabelle
authors.initials: I
authors.lastname: Grillo
authors.forename: Florian
authors.initials: F
authors.lastname: Meneau
authors.forename: Cyrille
authors.initials: C
authors.lastname: Rochas
mesh_terms: D002152:Calorimetry, Differential Scanning; D008823:Micelles; D008962:Models, Theoretical; D033363:Neutron Diffraction; D011060:Poloxalene / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry; D016062:Porosity; D011409:Propylene Glycols / Q000737:chemistry; D053838:Scattering, Small Angle; D012822:Silicon Dioxide / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D008823:Micelles; C116176:PEO-PPO-PEO; D011409:Propylene Glycols; C509969:SBA-15; C464484:pluronic block copolymer P123; D011092:Polyethylene Glycols; D012822:Silicon Dioxide; D011060:Poloxalene