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On the analysis of positron annihilation lifetime spectroscopy data in semicrystalline miscible polymer blend systems
Author(s) -
Simon G. P.,
Zipper M. D.,
Hill A. J.
Publication year - 1994
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.1994.070520903
Subject(s) - crystallinity , amorphous solid , materials science , miscibility , polycarbonate , positron annihilation , polymer , thermal analysis , polymer blend , polymer chemistry , volume (thermodynamics) , spectroscopy , copolyester , composite material , chemical engineering , positron , thermodynamics , thermal , chemistry , organic chemistry , copolymer , polyester , physics , nuclear physics , quantum mechanics , electron , engineering
A free volume probing technique, positron annihilation lifetime spectroscopy (PALS) is used to characterize miscible blends of amorphous polycarbonate with a semicrystalline copolyester at room temperature. The paper describes the analysis required to use the PALS technique to probe the amorphous regions in which the miscibility of the blends occurs. Analysis of the raw PALS data in this system involves taking account of the influence of crystallinity on the PALS results. The results demonstrate that the PALS technique is able to discriminate between free volume in the amorphous regions of as‐molded and annealed samples. This difference in free volume between samples of differing thermal history is assigned to the influence of polymer crystals on the stress state of the miscible amorphous regions. © 1994 John Wiley & Sons, Inc.