This question is on behalf of one of my friends:
1. What will happen if a differential scanning calorimeter (DSC) runs up to 300 oC for a polymer having Tg = 45 - 65 oC. If any problem arises can that be solved by Liquid nitrogen.
2. What is the use of liquid nitrogen in DSC analysis?
It always depends on the particular DSC instrument. Some DSCs can be cooled to sub-zero temperatures without using LN2 (for example, PerkinElmer equipped with an intracooler or cryostat). Then, LN2 cooling is only used if even lower temperature is needed. Other DSCs may require LN2 whenever the measurement is performed at sub-ambient temperatures.
If the expected Tg is around 45-65°C, then starting from an ambient temperature (approx. 25°C) should be sufficient. However, it would be better to start at about 0-10°C since Tg is usually determined from a second heating run and programmed cooling always requires certain temperature gradient.
It always depends on the particular DSC instrument. Some DSCs can be cooled to sub-zero temperatures without using LN2 (for example, PerkinElmer equipped with an intracooler or cryostat). Then, LN2 cooling is only used if even lower temperature is needed. Other DSCs may require LN2 whenever the measurement is performed at sub-ambient temperatures.
If the expected Tg is around 45-65°C, then starting from an ambient temperature (approx. 25°C) should be sufficient. However, it would be better to start at about 0-10°C since Tg is usually determined from a second heating run and programmed cooling always requires certain temperature gradient.
Thanks Subhankar and Tibor for your help. I have forwarded your replies and will post if I get any more follow up questions.
1) only problem with dry instrument [like to setaram dscIII], or fine controll of cooling step [but depend of the type cooling system of dsc]
2)dry electronic and fournace. Cooling system [but not in all dsc]
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