Can anyone explain why there is coloration of my PVDF films prepared by solution casting method using solvents DMAC & DMSO?
I think it may be some sort of degradation of the polymer, I noticed this degradation of these just PVDF films before I oven dried them; when I did oven dry this coloration only got worse.
Note: details of the preparation are in the photos I've attached, temperature in degrees and the number of holes is the amount of holes I poked in the aluminium foil cover over the petri dish which contained the solution, this was to allow the solvent to evaporate in the fume cupboard when it was cast.
I've also attached of a PVDF/PPG blend film I left in the oven for nearly two weeks at 150 - does this seem to be oxidation degradation> This sample did not seem show any coloration before the oven dry (where as the pure PVDF films did) so not really sure what's going on here.
A transparent PVDF film should be 100% amorphous. Normally, PVDF is a polycrystalline and solidifies in pale yellow color films.
This can be caused by many factors, however, the most probable are:
1- Oxidation.
2- Degree of crystallization.
3- Degradation due to solvent treatment.
4- Trapping of the solvent in the polymer.
FTIR and DSC are required to find out the which factor is dominated.
I think Dr. Mohammad Arjmand can help you exactly. He is an expert in this filed. Please make a contact with him.
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