Setting Up a DSC Heat/Cool/Heat Procedure


DSC Heat/Cool/Heat experiments are designed to erase previous thermal history by heating the material above a transition (e.g., glass transition or melting), where relaxation or molecular rearrangement can occur, then cooling at a known rate before heating again.  The first heating curve provides the “as received” information. The cooling imparts a known thermal history.  Therefore, any differences observed between similar materials in the second heating curve are related to real internal differences in the materials (e.g., molecular weight) rather than previous thermal history effects.

If you want to set up a DSC heat/cool/heat procedure, you can choose one of two techniques—the DSC Wizard or the Experimental View - Procedure Page. See the instructions below for each technique.

When you perform a DSC Heat/Cool/Heat experiment, the following parameters need to be chosen:

You can choose to start your experiment from one of the following choices:

  1. Current Temperature—the temperature of the DSC cell at the current moment (usually ambient temperature, 35°C). In this case, the ramped heating begins immediately on starting the experiment.

  2. Another Temperature—you choose the specific temperature desired (default is 50°C). In this case, the system equilibrates at the chosen temperature before ramped heating begins.

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Using the DSC Wizard :

Enter the desired parameters, then select Next to proceed.

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Using the Experimental View Procedure Page:

  1. Display the Procedure Page. Select the desired experiment from the list of available preprogrammed templates.

  2. Enter the desired parameters. When you have finished setting up this procedure, you can enter more information by selecting the Notes Page and Summary Page for this run.

  3. Click the Apply button when finished to save these changes or the Append  button to save the changes to this run and add another run to the end of the sequence.

NOTE: You can use any test template as the basis for a custom test by selecting the desired test template from the list of tests, then click the Apply button and change the test to Custom. Then you can click on the Procedure Page and then the Editor button to make the changes desired.

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