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Free volume studies in miscible polymer blend systems
Author(s) -
Campbell Jonathon A.,
Goodwin Y. A.,
Ardi Mohsen Safari,
Simon George P.,
LandryColtrain Christine J. T.
Publication year - 1997
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19971180150
Subject(s) - volume (thermodynamics) , volume fraction , polymer blend , materials science , polymer , amorphous solid , thermodynamics , mixing (physics) , positron annihilation , polymer chemistry , chemistry , composite material , positron , crystallography , copolymer , physics , quantum mechanics , electron
This paper summarises the currently available literature concerned with measurement of free volume in miscible, amorphous polymer blends using positron annihilation lifetime spectroscopy (PALS) which probes excluded volume at the angstrom level. Previously reported data is compared with new data from a range of different blend systems. Miscible blends tend to show a negative deviation of free volume size (and to a lesser degree free volume fraction) on mixing due to the intimacy of packing of the blend component macromolecules. A largely immiscible system is also reported and shows a different behaviour (positive deviation of free volume size) and this is ascribed to additional free volume at the interface.