title: Physicochemical properties of micelles of poly(styrene-b-[3-(methacryloylamino)propyl]trimethylammonium chloride-b-ethylene oxide) in aqueous solutions.
abstract: Polymeric micelles from a new triblock copolymer, polystyrene-block-poly[(3-(methacryloylamino)propyl)trimethylammonium chloride]-block-poly(ethylene oxide) (PS-b-PMAPTAC-b-PEO), were prepared in aqueous solutions and characterized by various techniques including dynamic light scattering (DLS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and fluorescence spectroscopy. The micelle consists of a PS core, PMAPTAC shell, and PEO corona. It was revealed by SEM and DLS measurements that the micelles have a spherical structure with a hydrodynamic diameter about 75 nm. The addition of tungstate to the micellar solution caused a morphological change in the micelles from extended to shrunken spheres, which can be attributed to the fact that electrostatic repulsion among the cationic PMAPTAC blocks is canceled by the negative charge of the bound tungstate ions. Effective incorporation of tungstate ions into the micelles were confirmed by TEM and zeta-potential measurements.
authors.affiliation: Department of Chemistry, Faculty of Science and Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan.
authors.forename: Jingjing
authors.initials: J
authors.lastname: Liu
authors.forename: Dian
authors.initials: D
authors.lastname: Liu
authors.forename: Yuuichi
authors.initials: Y
authors.lastname: Yokoyama
authors.forename: Shin-Ichi
authors.initials: S
authors.lastname: Yusa
authors.forename: Kenichi
authors.initials: K
authors.lastname: Nakashima
mesh_terms: D000643:Ammonium Chloride / Q000138:chemical synthesis / Q000737:chemistry*; D002627:Chemistry, Physical; D008027:Light; D008823:Micelles; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D015394:Molecular Structure; D010316:Particle Size; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D011137:Polystyrenes / Q000138:chemical synthesis / Q000737:chemistry*; D012542:Scattering, Radiation; D012996:Solutions; D013050:Spectrometry, Fluorescence; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D008823:Micelles; D011108:Polymers; D011137:Polystyrenes; D012996:Solutions; C535252:poly(styrene-b-(3-(methacryloylamino)propyl)trimethylammonium chloride-b-ethylene oxide); D000643:Ammonium Chloride; D014867:Water