Properties of Cyanoethyl Pullulan (CEP)


#1

Hi folks,

I’m looking for some details about Cyanoethyl Pullulan (CEP). I allready oredered the chemicals, but it takes time (Germany-USA-China-USA-Germany…)

Anyway, does anybody has some details about the CEP?

  • dielectric breakdown strength
  • spincoating table (SPINspeed-time-concentration to layer thickness)
  • dipcoating table (DIPspeed-time-concentration to layer thickness)

found some papers about spinning, but cannot find anythink about dipping an the dielectric strength.

cheers,
Sebastian


#2

Hi Sebastian,

I've attached the Cyanoresin brochure that I received when purchasing
CEP. It lists a dielectric breakdown strength for CR-S as 2100 V/mil.
We've been spin coating devices with thicknesses in the range of 1-2
microns, which should correspond to a breakdown voltage of ~80-170 V.
We haven't thoroughly characterized the breakdown voltage of our
devices, but those numbers seem to be in the right ballpark.

I don't have any experience with dipcoating.

-Ryan

CYANORESIN BROCHURE.PDF (2.05 MB)

···

On Fri, May 22, 2015 at 11:23 AM, Sebastian vdE <sebasti...@kit.edu> wrote:

Hi folks,

I'm looking for some details about Cyanoethyl Pullulan (CEP). I allready
oredered the chemicals, but it takes time (Germany-USA-China-USA-Germany...)

Anyway, does anybody has some details about the CEP?

- dielectric breakdown strength
- spincoating table (SPINspeed-time-concentration to layer thickness)
- dipcoating table (DIPspeed-time-concentration to layer thickness)

found some papers about spinning, but cannot find anythink about dipping an
the dielectric strength.

cheers,
Sebastian

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#3

Thanks! That will help.


#4

Sebastian,

Who did you order your CEP from? Do you have a part number?

–Michael

···

On Friday, May 22, 2015 at 8:23:29 AM UTC-7, Sebastian vdE wrote:

Hi folks,

I’m looking for some details about Cyanoethyl Pullulan (CEP). I allready oredered the chemicals, but it takes time (Germany-USA-China-USA-Germany…)

Anyway, does anybody has some details about the CEP?

  • dielectric breakdown strength
  • spincoating table (SPINspeed-time-concentration to layer thickness)
  • dipcoating table (DIPspeed-time-concentration to layer thickness)

found some papers about spinning, but cannot find anythink about dipping an the dielectric strength.

cheers,
Sebastian


#5

Hi Michael,

I ordered my CEP from Biddle Sawyer Corporation, USA:

Product: Cyanoethyl Pullulan ( Cyanoresin CR-S)
Quantity: 100gms net
Packing: Foil/mylar sealed bag

As I said, they’re just a reseller for the Shin-Etsu Chemical CO, ltd. So it might take a while…

Best,
Sebastian


#6

I finally got my Cyanoresin!

As soon as I get a laboratory place for the chemicals, I will start to try the recipies I found in several papers. But out lab-chiefs are a little bit concerned about the DMF as a solvent -> means we need fume cuppord and the spincoater in it. Does anybody of you have experience with it and maybe some experience with alternative solvents?

Best,
Sebastian


#7

Hi Sebastian,

The datasheet has a table of CR-S solubility in various organic
solvents. There appear to be lots of options, but I don't have any
personal experience to report.

I prefer to avoid DMF (the solvent) wherever possible, just to avoid
confusion :wink:

-Ryan

···

On Mon, Jun 15, 2015 at 8:19 AM, Sebastian vdE <sebasti...@kit.edu> wrote:

I finally got my Cyanoresin!

As soon as I get a laboratory place for the chemicals, I will start to try
the recipies I found in several papers. But out lab-chiefs are a little bit
concerned about the DMF as a solvent -> means we need fume cuppord and the
spincoater in it. Does anybody of you have experience with it and maybe some
experience with alternative solvents?

Best,
Sebastian

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#8

Hello everybody,

I just tested some solvents for the cyanoethyl and they all seem to work quite fine: e.g. Propylen Carbonate, Cyclohexanone, Acetonitril with PGMEA.

But our laboratory team has concerns about the cyanoethal itself. The MSDS of the Cyanoresins shows two colums “cyanoethyl pullulan” and “aceton (-solution?)”. And now they aren’t sure, if it means, that the CEP i totally harmless in any case, or does it becomes very ugly when in solution?

Does anybody have a reliable answer for their concerns?

Best,
Sebastian


#9

My experiences with CEP so far:

Propylencarbonate seems to be an excellent solvent for CEP. Not dangerrous and good physical properties. I work with 20wt% and 30wt% solution to create 1-3µm or 4-10µm layers. On a 1.5µm layer we need 35V to move a water droplet, on a 7µm layer we need 65V for a good moveablity. But those thin layers seem to be quite fragile, got breakdowns within minutes or even seconds. My first thick-layer chip was stable over 30 minutes at 60-85V, before I got one breakdown.

Breakdowns
Do you know this situation: you playing around with a new chip, DI-water, moderat voltage and you be happy about the quick and precise movements or a long time. Then you add another fluid, for example water with some dye, and blubblub frzzlzlzlzl srrrrrrr it broke down. Are there fluids or additives, which let a chip break? (I don’t think, that it pass/dissolve the teflon layer)
Layer quality
My spincurves are quite nice, and the layer look fine. But on larger areas (chips ^^) i always get some particles in it. The 30wt% solution is so thick, that I cannot push it through a normal siringe filter. Any ideas, how I could filter it?

Cheers,
Sebastian


#10

We've also experienced similar issues with the reliability of
CEP-based devices (mostly using 20% wt in DMF). Compared to our
standard Parylene-C process which is highly robust and approaching
100% consistency, CEP seems to be hit-or-miss. We've had several
batches that seemed to work well, but others that breakdown almost
instantly. Part of the problem is that its not easy to decouple
breakdowns caused by material properties versus non-uniform coating
and/or point defects.

That said, I'm not ready to give-up on CEP since we haven't devoted a
lot of time to optimizing the process. It may be possible to produce
highly reliable devices given the right conditions, but we haven't
figured out what those conditions are yet...

-Ryan

···

On Fri, Nov 6, 2015 at 10:27 AM, Sebastian vdE <sebasti...@kit.edu> wrote:

My experiences with CEP so far:

Propylencarbonate seems to be an excellent solvent for CEP. Not dangerrous
and good physical properties. I work with 20wt% and 30wt% solution to create
1-3µm or 4-10µm layers. On a 1.5µm layer we need 35V to move a water
droplet, on a 7µm layer we need 65V for a good moveablity. But those thin
layers seem to be quite fragile, got breakdowns within minutes or even
seconds. My first thick-layer chip was stable over 30 minutes at 60-85V,
before I got one breakdown.

Breakdowns
Do you know this situation: you playing around with a new chip, DI-water,
moderat voltage and you be happy about the quick and precise movements or a
long time. Then you add another fluid, for example water with some dye, and
*blubblub frzzlzlzlzl srrrrrrr* it broke down. Are there fluids or
additives, which let a chip break? (I don't think, that it pass/dissolve the
teflon layer)

Layer quality
My spincurves are quite nice, and the layer look fine. But on larger areas
(chips ^^) i always get some particles in it. The 30wt% solution is so
thick, that I cannot push it through a normal siringe filter. Any ideas, how
I could filter it?

Cheers,
Sebastian

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