I tested my samples using DMA and DSC.. and the Tg of the same samples was very different in DSC vs tan delta. I have read some articles that it won't have the same value because it has different sensitivities to the samples, but I was wondering if I'm testing my samples wrongly. The lab I sent my samples to, only requested me to cut them (PSA with PET film still attached on both sides of the adhesive) and give it to them. So I think, maybe if they don't remove the PET film, the PET film may affect my results. I'm now confused about how you do it.
Here are my conditions:
1. In film tension mode
2. strain rate: 0.1%
3. Frequency: 1Hz
4. Heating rate: 5degrees Celcius/min
5. Temperature range: -70 to 60 degrees Celcius
Thank you~
First, you should use the DMA with the compression set clamp with the PSA between the clamp. Second, your frequency is too low. You should determine where the linear visco-elastic region is for your material is. This you should do an amplitude and frequency sweep before you do a temperature ramp. Hope this helps.
Levi Scott Thank you for your answer. but would you know if there's a way where I can only test the PSA films through DMA without the PET films? my samples are in this form: PET-PSA-PET. Because I think when I test it through DMA, the PET films affects my results
Jernette Oblepias if you can not remove the PSA or if the coating is too thin, you may need to rely on a different test methods (DSC) based on total amount is PSA collected. It is common to use GPC, FTIR, and LC(MS) to characterize the polymer.
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