Questions tagged [differential-scanning-calorimetry]

This tag should be applied to questions regarding the theory and application of differential scanning calorimetry (DSC).

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Why would the first Tg be higher than a rescan Tg of an epoxy by DSC? [closed]

I have some small cured epoxy shafts I am cutting segments out of for checking Tg by DSC. First scan gave a Tg of 118 °C, follow on was 109 °C. Scans were repeated on a new sample of the shaft with ...
2
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1answer
128 views

Does alumina become transparent at high temperatures?

Consider a normal opaque alumina crucible. I've heard that they become transparent at higher temperatures and therefore, are not appropriate for high precision DSC (caloric) measurements. The reason ...
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2answers
158 views

Assigning labels and answering questions using given DSC graph

I'm currently working through past exam papers in preparation for my upcoming Inorganic Chemistry exam and I got to this question. We really haven't looked at DSC graphs, so I'm not completely sure ...
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0answers
121 views

Correctness of DSC curve for polyamid or polyester

I did a DSC on a part of an alternator car belt. We already found out that it should by a polyester or a polyamid. But then we got the following DSC curve: How is it possible that the glass ...
2
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1answer
229 views

DSC Metal hysteresis (melt/cryst)

So we were analyzing Polymers using DSC and calibrated the system using Indium. I expected it to be a single transition only as Indium only has 1 known crystal structure and as I never worked with DSC ...
2
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0answers
56 views

Is Polymorphism accompanied with an energy change?

Differential Scanning Colorimetry (DSC) is a technique used to identify Polymorphism by revealing two melting points of a pure crystalline structure. DSC shows a peak associated with the formation ...