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A Nanotechnology Pathway to Arresting Phase Separation in Soft Nanocomposites
Author(s) -
Pomposo José A.,
de Luzuriaga Alaitz Ruiz,
García Iñaki,
Etxeberria Agustín,
Colmenero Juan
Publication year - 2011
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.201000720
Subject(s) - lower critical solution temperature , nanocomposite , materials science , nanoparticle , polymer , miscibility , polymer nanocomposite , phase (matter) , chemical engineering , dispersion (optics) , polymer chemistry , nanotechnology , composite material , chemistry , copolymer , organic chemistry , optics , physics , engineering
Abstract Direct observation of the miscibility improving effect of ultra‐small polymeric nanoparticles (radius ≈4 nm) in model systems of soft nanocomposites is reported. We have found thermodynamically arrested phase separation in classical poly(styrene) (PS)/poly(vinyl methyl ether) blends when PS linear chains were totally replaced by ultra‐small, single chain PS nanoparticles, as determined by thermo‐optical microscopy measurements. Partial arrested phase splitting on heating was observed when only some of the PS chains were replaced by unimolecular PS nanoparticles, leading to a significant increase of the lower critical solution temperature (LCST) of the system (up to 40 °C at 15 vol.‐% nanoparticle content). Atomic force microscopy and rheological experiments supported these findings. Thermodynamic arrest of the phase separation process induced by replacement of linear polymer chains by unimolecular polymer nanoparticles could have significant implications for industrial applications requiring soft nanocomposite materials with excellent nanoparticle dispersion in a broad temperature range.