We have multiple samples of PHA polymers that are prepared differently. We would need Tg values with sufficient precision in order to compare the different samples, which will have relatively close Tg values. I believe values to at least 1oC would be sufficient.
I have been recommended to perform DSC testing at a heating rate of 1oC/min, performing multiple passes and repeating the test with replicate specimens to get the most accurate Tg. As far as I'm currently aware it isn't feasible to slow down the heating rate.
Are there any other ways of performing this test to ensure we have values precise enough for comparison or is performing multiple passes the best way of determining these values?
Dear Nate,
I would recommend DSC for this case. Alternatively, you could use DMTA for Temperature sweep (slow heating rate and testing frequency in the elastic region).
Best Regards,
Andrey
@andrey we have decided on DSC. However, I have been told that - as a rule of thumb - you cannot accurately measure Tg values that are less than 3 times your heating rate. The lab we will be accessing is normally calibrated to 1°C/min which would mean if we wanted results accurate to 1 degree our heating rate would be too quick.
- Badges
- Science topic
- Similar topics
- Philosophy
- Philosophy Of Science
- Reasoning