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Preparation of Polystyrene‐Poly( N ‐isopropylacrylamide) (PS‐PNIPA) Core‐Shell Particles by Photoemulsion Polymerization
Author(s) -
Lu Yan,
Wittemann Alexander,
Ballauff Matthias,
Drechsler Markus
Publication year - 2006
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200600190
Subject(s) - dispersity , materials science , polystyrene , poly(n isopropylacrylamide) , shell (structure) , polymerization , polymer chemistry , core (optical fiber) , chemical engineering , dispersion polymerization , homogeneous , lower critical solution temperature , copolymer , composite material , polymer , thermodynamics , physics , engineering
Summary: Monodisperse thermosensitive PS‐NIPA core‐shell particles composed of a PS core and a cross‐linked PNIPA shell can be successfully synthesized by a novel method: photoemulsion polymerization. Cryo‐TEM images indicate clearly the core‐shell morphology of the PS‐NIPA particles: A homogeneous regular PNIPA shell has been affixed on the spherical PS core. DLS measurements indicate that the obtained PS‐NIPA latex particles are thermosensitive. The shell of PNIPA networks with different cross‐linking densities can shrink and re‐swell with temperature and the volume transition temperature is around 32 °C in all cases.Cryo‐TEM image of PS‐NIPA core‐shell particles.