Hello everyone!

I have been thinking about extracting the storage and loss moduli (E’ and E”) of two viscoelastic materials -- namely PLA @200 C and PCL @90 C -- and use these values in modeling the materials’ viscoelastic behaviors using generalized Maxwell models.

I was hoping to do this with DMA (frequency sweeps with temperatures set constant at 200C and 90C, respectively). My original plan was to extract E’ and E” and use optimization/ curve fitting techniques to determine the elastic constants (E0, E1, E2, … n1, n2, …) of the Maxwell models. But now I am having a second thought about the validity of this approach given the materials would in molten states at the indicated temperatures.

My questions are:

I am kindly asking for your thoughts and guidance on this. I appreciate your time.

Thank you!