| Abstract: | The variation of free‐volume parameters (lifetime, intensity, and distribution) after sorption and desorption of CO2 and CH4 gases in the glassy polymer poly1‐(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 nm3 and intensity of 22% in addition to a free‐volume hole size of 0.197 nm3 with an intensity of 11%. In polyethylene free‐volume hole sizes of 0.107 and 0.153 nm3 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 |
