when post curing applied to thermoset resin, a significant decrease in room temperature storage modulus is observed during my experiments. As far as i know, as the x-link increases , modulus also increases. What should be the explanation? Is this also an indication of decrease in tensile strength, can we correlate these directly?
Loss modulus is decreased and broadened as it is expected. But what happens to Storage modulus?
if temperature and frequency are sententiously increases up to certain point the bonding between the stryene and fibers are broken due to the visco elastic behaviour
From what i have read I can say that the absolute value of any modulus is useless for a viscoelsatic fluid. It is the ratio of corresponding ( at same temperature and frequency) loss moduli and storage moduli that is found to predict change over from viscous to elastic behaviour and vise versa
"when post curing applied to thermoset resin," - may be degardation as a result of overheating?
Thank you for your answers. Degradation was on of our predictions about the decrease in modulus value. But Glass transition temperature increases as we increase the curing. This is what we are confused about, because as we increase applied temperature or cure time, we achieve increase in glass transition temperature but also a significant decrease in modulus.
What method you used for definition of the module? Judging from the fact that you write about two modules, you used DMA? This method does not give exact value of the module and you do not write what configuration of a sample was used - a bend, stretching or compression. Also absolute values are interesting.
Hi Deniz,
Can you share your graphs?
It seems a contradictory result.
I am really keen on to dig its root cause.
Sincerely,
Amin
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