Abstract
It is found that physical ageing in PMMA decreases the isomerization ability of probes requiring larger volumes to isomerize more than the probes that require smaller volumes. The results indicate that, upon physical aging, larger pockets ol local free volume decrease in number more than the smaller pockets, causing the size distribution of local free volume to narrow upon aging. The degree of the decrease in a local free volume fraction was found to depend on the aging time and aging temperature.
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