I am devising an experiment to be done in the lab and cannot seem to find any rheodestructive substances (except gypsum plaster which I do not wish to use).
Does anyone know of any pharmaceutical polymers or oils which are so?
Thanks
Guess it depends on your meaning of 'rheodestructive' - a curing epoxy resin changes its structure and the rheological properties alter
I agree with the other Alan - to give helpful advice, we need to know exactly how you define "rheodestructive".
Thank you for your help.
I would like to know an example of a fluid that upon being applied shear stess its viscoity decreases with no reformation of the original viscosity.
I still retain my confusion. If you heat water up and maintain the temperature the viscosity decreases and the original viscosity is not 'reformed' until the temperature is lowered again.
This definition seems clear enough to me - a substance that once sheared does not return to its original structure. Weak gelatine (say 2%) or high methoxy pectin (=jam) might be interesting, although they may recover a lot of structure of you wait long enough (days).
OK, then liquid crystals, in the isotropic phase, lower their viscosity when going into an ordered nematic phase when the temperature is lowered below the clearing point.
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