Styrene and methyl methacrylate
MARSHALL DUDLEY
I was surprised at the high viscosity of the styrene. I thought it would be
water thin like the MM, but it is more like syrup. Is this normal, or did I
receive partially polymerized styrene?
Is there a gas that I can use to polymerize thin films of these monomers?
Would ozone or another active gas provide the necessary free radicals?
Do I use the same method to de-stablize MM as I would for styrene, shake with
50% sodium hydroxide then wash with clean water? After de-stablizing can the
monomers be kept any length of time at reduced temperature, ie. 0 degrees F?
Any assistance would be greatly appreciated.
Marshall
Song-Tai Lee
>I was surprised at the high viscosity of the styrene. I thought it would be
>water thin like the MM, but it is more like syrup. Is this normal, or did I
>receive partially polymerized styrene?
>
>Do I use the same method to de-stablize MM as I would for styrene, shake with
>50% sodium hydroxide then wash with clean water? After de-stablizing can the
>monomers be kept any length of time at reduced temperature, ie. 0 degrees F?
(1) You must have received a polymerizad styrene monomer. Pore it into methonal,
it would not be a clear solution.
(2) Yes, the same procedures used in St would be fine for MMA. Don't forget to
distil the destabilized monomers. The shelf-life for purified MMA is about
2 weeks under 0 degree C.
Antoni S. Gozdz 21621
>I just received some styrene and MM monomers to do some experimenting with.
>water thin like the MM, but it is more like syrup. Is this normal, or did I
>receive partially polymerized styrene?
Yes.
>
>Is there a gas that I can use to polymerize thin films of these monomers?
>Would ozone or another active gas provide the necessary free radicals?
UV with some photosensitizer/intiator under nitrogen would be better.
>
>Do I use the same method to de-stablize MM as I would for styrene, shake with
>50% sodium hydroxide then wash with clean water? After de-stablizing can the
1 M NaOH should be enough. After washing with water, dry it over
Drierite(TM) or something similar. Then distill under low
pressure to avoid polmerization, if you want pure monomer,
instead of a prepolymer...
>monomers be kept any length of time at reduced temperature, ie. 0 degrees F?
Sure, it should be stable for weeks at that temperature.
>
>Any assistance would be greatly appreciated.
Tony
---------------------
Antoni S. Gozdz PWr '72 'Atoms are not things'
to...@nyquist.bellcore.com W. Heisenberg
JR. Eastman
: I just received some styrene and MM monomers to do some experimenting with.
: I was surprised at the high viscosity of the styrene. I thought it would be
: water thin like the MM, but it is more like syrup. Is this normal, or did I
: receive partially polymerized styrene?
: Is there a gas that I can use to polymerize thin films of these monomers?
: Would ozone or another active gas provide the necessary free radicals?
: Do I use the same method to de-stablize MM as I would for styrene, shake with
: 50% sodium hydroxide then wash with clean water? After de-stablizing can the
: monomers be kept any length of time at reduced temperature, ie. 0 degrees F?
: Any assistance would be greatly appreciated.
: Marshall
If your styrene is 'syrupy' then I suggest it is partially polymerised.
The best way to purify is to distil the styrene under an atmosphere of
nitrogen at a reduced pressure. Keep the collecting vessel in a
methanol/dry ice bath and keep the distilling styrene at 60C. To test if
your styrene is free of polymerised styrene, drop some of the styrene into
methanol. If it goes cloudy then it still contains polystyrene.
You should be able to keep this in a refridgerator under nitrogen for a
couple of weeks.
--
John Eastman
John.E...@Bristol.ac.uk
School of Chemistry
University Of Bristol
UK
dumont
C'est Jeff qui te fait un gros bisous