TTS Tutorial

  1. Start RepTate and create a new LVE Application logo:

    New application

  2. Drag and drop files with .osc extension, e.g. the set of PI_*.osc files in the data/PI_LINEAR/osc/ folder. See Data Files for a description of the data file organization.

    Load data

  3. Select a theory, e.g. “WLF Shift” theory, and press einstein to create it (calculation is done with default parameter values). Press “Minimize Error” fit.

    New theory

  4. Change a parameter, e.g. set the reference temperature to \(T_0=-40^\circ\)C, and press “Minimize Error” fit.

    New theory

  5. To save the theory line(s), click the th_save button. A dialog will ask for a folder where the theory files will be saved.

Note

When the “Vertical Shift” button arrow_up is checked, vertical shift of the data is allowed.

Note

When the “Shift to Isofrictional State” button iso is checked, RepTate includes the molecular-weight dependence of \(T_g\) in the WLF horizontal shift. The correction uses the file molecular weight Mw and the theory parameters CTg and dx12. Untick this option when this correction should not be applied, for example for well-entangled monodisperse samples where the molecular-weight dependence of \(T_g\) can be neglected.