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Appendix B
Figure B.21
B–72
Sample size (approximately 10.45mg), sensitiv-
ity setting (1.0), purge gas (100 mL/minute dry
air) and sample pan (open platinum) were all
held constant from run to run.
As can be seen in the examples, the results are
similar in each scan except that the measurement
of transitions is moved to slightly lower tem-
peratures as heating rate is reduced, and each
run takes about 50% longer to complete when
heating rate is reduced by 50%. Most notice-
able, however, is that transition resolution is
best in the fastest scan. This is because higher
maximum heating rates allow the TGA furnace
temperature to change more quickly between
transitions which reduces transition overlap and
flattens weight loss baseline. As an added
benefit, experiment time is reduced compared to
traditional resolution enhancement techniques.
Here we can see the real beauty of dynamic rate
Hi-Res
TM
TGA: better results in the same or less
time as traditional constant heating rate TGA.
TA I
TGA 2950
NSTRUMENTS
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