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Synthesis and characterization of PNIPAM/PS core/shell particles
Author(s) -
Zhang Li,
Daniels Eric S.,
Dimonie Victoria L.,
Klein Andrew
Publication year - 2010
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.31508
Subject(s) - dispersity , materials science , polystyrene , dynamic light scattering , particle (ecology) , polymerization , chemical engineering , precipitation polymerization , polymer chemistry , particle size , core (optical fiber) , transmission electron microscopy , shell (structure) , radical polymerization , nanoparticle , composite material , nanotechnology , polymer , oceanography , geology , engineering
Crosslinked, monodisperse PNIPAM particles were synthesized by precipitation polymerization. The particle size was measured by dynamic light scattering (DLS), capillary hydrodynamic fractionation (CHDF), and transmission electron microscopy (TEM). Two different polymerization methods were used to prepare PNIPAM/PS core/shell particles, both above and below the volume phase transition temperature (VPPT) using either a semibatch or seeded semibatch polymerization process. In both processes, uniform “raspberry” structures were obtained in which polystyrene formed small domains on the surface of the PNIPAM particles. The resulting core and shell structure was confirmed by temperature‐dependent particle size and density gradient experiments. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010