🚀 go-pugleaf

In article <1992Jul31.175332.10341@kodak.kodak.com>
ornitz@kodak.kodak.com (Barry Ornitz) writes:
 
>
>In article <1992Jul30.170903.12107@ee.gatech.edu> drabik@eecom.gatech.edu
>(Timothy J. Drabik) writes:
>>I'm looking for a solvent for polyvinylidene flouride.
>>I would like to spin-deposit it.  Can anyone recommend
>>a journal reference or a chemical?
>
>PVDF is used extensively in the chemical industry because of its chemical
>resistance to most materials.  In fact, it is used as a replacement for PTFE
>(Teflon) in many applications because of superior mechanical properties with
>only a slight decrease in chemical resistance.  Finding a solvent for
>polyvinylidene difluoride will be very difficult.
>
>Having said this, however, I will add that one of our commercial high boiling
>point solvents, Ektasolve EEP, has been known to attack PVDF.  In our
>manufacturing process for EEP, Kynar (PVDF) coated pH probes were dissolved
>away completely as were Kynar insulated electrical conductivity probes.  I
>am not sure this solvent will meet your needs however.
>
>Why do most net posters always mistakenly spell fluorine containing compounds
>as if they were bakery products?   ;-)
>						Barry
> -----------------
>|  ___  ________  |       Dr. Barry L. Ornitz          WA4VZQ
>| |  / /        | |       Eastman Kodak Company
>| | / /         | |       Eastman Chemical Company Research Laboratories
>| |< < K O D A K| |       Process Instrumentation Research Laboratory
>| | \ \         | |       P. O. Box 1972, Building 167B
>| |__\ \________| |       Kingsport, TN  37662       615/229-4904
>|                 |       INTERNET:   ornitz@kodak.com
> -----------------
 
 
 Polyvinylidene difluoride (PVDF) has been extensively researched in early
1980's because of on of its crystallographic form which is piezoelectric.
This form, made by Penwalt (sp?) Corp. under tradename KYNAR, has found
many applications as thin film piezoelectric transducer. I don't know how
Penwalt makes it but I remember casting PVDF films for my Raman studies. The
solvents I used were hexane and acetone. As Dr. Ornitz mentioned it is not
readily soluble and some patience is needed. However, for spincoating technique
the above solvents aren't the ideal one. I would suggest to start with low
molecular weight polymer (Aldrich) in form of powder rather than pellets.
Filtering the solution is another problem and may cause some gray hair grow.
For more info I would scan Chem Abs (1980-4). Unfortunately I don't have
references I used for my work anymore.
 
Regards,
 
Ryszard Burzynski