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Positron annihilation lifetime studies of gas sorption and desorption in polyethylene and poly[1‐(trimethylsilyl)‐1‐propyne]
Author(s) -
Mohsen M.,
Gomaa E. A. H.,
Schut H.,
Van Veen A.
Publication year - 2001
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.1178
Subject(s) - propyne , low density polyethylene , polyethylene , high density polyethylene , materials science , sorption , volume (thermodynamics) , desorption , polymer chemistry , polymer , analytical chemistry (journal) , chemistry , thermodynamics , composite material , organic chemistry , physics , adsorption
The variation of free‐volume parameters (lifetime, intensity, and distribution) after sorption and desorption of CO 2 and CH 4 gases in the glassy polymer poly[1‐(trimethylsilyl)‐1‐propyne] (PTMSP) and in the rubbery high‐density polyethylene (HDPE) and low‐density polyethylene (LDPE) were determined by the PAL technique. Size distributions deduced from PAL measurements reveal the presence of large free‐volume holes in PTMSP with an average size of 0.725 nm 3 and intensity of 22% in addition to a free‐volume hole size of 0.197 nm 3 with an intensity of 11%. In polyethylene free‐volume hole sizes of 0.107 and 0.153 nm 3 with intensities of 21% and 25% could be deduced for HDPE and LDPE, respectively. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 970–974, 2001