title: Differences of internal structures between amphiphilic and hydrophobic block-copolymer nanoparticles.
abstract: In this report, we show a novel and simple preparation method for obtaining block-copolymer nanoparticles. Regular-sized polymer nanoparticles are formed after evaporation of a good solvent from a polymer solution containing a non-volatile poor solvent and the volatile good solvent. Nanoparticles of poly(styrene-b-sodium acrylate), poly(styrene-b-4-vinylpyridine), and poly(styreneb-isoprene) were prepared by using this method. We also discuss the difference of internal structures between amphiphilic and hydrophobic block-copolymer nanoparticles. From the results of scanning transmission electron microscope (STEM) imaging, the particles of amphiphilic block-copolymers have hollow structures were observed. On the other hand, the particles of a hydrophobic block-copolymer form lamellar micro-phase separation structures.
authors: Graduate School of Science, Hokkaido University, NIOW8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan.
authors: Takeshi
authors: T
authors: Higuchi
authors: Hiroshi
authors: H
authors: Yabu
authors: Masatsugu
authors: M
authors: Shimomura
mesh_terms: D000179:Acrylates / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D008855:Microscopy, Electron, Scanning; D015394:Molecular Structure; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology; D011137:Polystyrenes / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry; D011725:Pyridines / Q000737:chemistry; D012997:Solvents; D013501:Surface-Active Agents / Q000737:chemistry
chemical_list: D000179:Acrylates; D011137:Polystyrenes; D011145:Polyvinyls; D011725:Pyridines; D012997:Solvents; D013501:Surface-Active Agents; C509855:poly(styrene-b-acrylic acid); C509607:polystyrene-block-poly(4-vinylpyridine)