w**i 发帖数: 159 | 1 When I applied time-temperature superposition principle to make a master
curve for my data, the vertical shift factors were unusually large (greater
than 1.5; should be less than 1.1 under normal conditions). Has anyone ever
had this issue before or does anyone know the possible reasons for this?
Thanks. | w********h 发帖数: 12367 | 2 the reason is: gap issue.
when a wide range of temperatures are applied in measurements,
it is inevitable to have gap issue, which means gap is not what you can see
from the meter simply because nobody knows how much the sample and the
parallel disks will expand or shrink precisely during the change of
temperature.
consequently, the rheological data such as viscosity and moduli at
temperatures other than the reference temperature can be inaccurate. that's
why the vertical shift factor bT can be
【在 w**i 的大作中提到】 : When I applied time-temperature superposition principle to make a master : curve for my data, the vertical shift factors were unusually large (greater : than 1.5; should be less than 1.1 under normal conditions). Has anyone ever : had this issue before or does anyone know the possible reasons for this? : Thanks.
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