Thermal measuring and testing – Thermal testing of a nonthermal quantity – Expansion or contraction characteristics
Patent
1998-04-14
1999-12-28
Gutierrez, Diego
Thermal measuring and testing
Thermal testing of a nonthermal quantity
Expansion or contraction characteristics
374 56, G01N 2500
Patent
active
060072407
ABSTRACT:
By employing a "modulated-temperature" heating program composed of a series of heat-isotherm stages, it is possible to separate the change in dimensions of an oriented material during heating into two contributions: a thermally "reversing" component which is due to linear thermal expansion and a "non-reversing" part arising from relaxation to the disordered state on heating above T.sub.g. Some preliminary results for biaxially drawn poly(ethylene terephthalate) film are presented.
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Fernandez Maria
Gutierrez Diego
TA Instruments, Inc.
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