Chemical Forums
Specialty Chemistry Forums => Materials and Nanochemistry forum => Topic started by: lag on July 10, 2008, 09:43:20 AM
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Hi,
I would like to cast a thin layer of PMMA PolyMethylMetAcrylate on a silicon mold. I bought a commercial PMMA in powder, and I found a recipe to dissolve it in toluene (2% w/w). Does anybody know a different, but effective, recipe?
Thanks a lot!
bye!
lag
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You could spin it out with just about any solvent for PMMA I would think. We used chlorobenzine IIRC, but what's wrong with toluene? For thicker films use either a higher conc of polymer or a slower spinning speed. For thinner films use a lower polymer conc or a faster spinning speed.
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Toluene would work well. P's suggestions of a chlorinated solvent could be hazardous depending on you're background with working with chemicals.
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P's suggestions of a chlorinated solvent could be hazardous depending on you're background with working with chemicals.
Yes that's right, I'm just saying that it's what we used to use - Toluene sounds fine. I used impermeable gloves, a cleanroom suit, goggles and the solutions were prepared and spun in a fume cupboard. We tried not to breath over the disk when spinning as particulates from your breath can cause comet trails in the coating. Takes a couple of goes of practice to get it right.
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iam using pmma in powder and it dissolves in dimethyl formamide well but dimethyl formamide is hazardous to health
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Most organic solvents are. You have to take the proper precautions when using them.
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Hi,
I would like to cast a thin layer of PMMA PolyMethylMetAcrylate on a silicon mold. I bought a commercial PMMA in powder, and I found a recipe to dissolve it in toluene (2% w/w). Does anybody know a different, but effective, recipe?
Thanks a lot!
bye!
lag
THF will prob work best.
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I have previously formed PMMA films of variable thickness by casting from toluene (1 - 5% w/v). If you want an alternative solvent that evaporates faster, try either THF or ethyl acetate. I would personally stay away from chlorinated solvents, unless of course you are a trained chemist and you have access to a fume-cupboard.
Bear in mind that if your PMMA has a high molecular weight (which it probably does), then you should leave the solution to stand for several hours at least before casting it.
Best wishes
Athan
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Hi,
This is Prasad.
Yes that's right, I'm just saying that it's what we used to use - Toluene sounds fine. I used impermeable gloves, a cleanroom suit, goggles and the solutions were prepared and spun in a fume cupboard. We tried not to breath over the disk when spinning as particulates from your breath can cause comet trails in the coating. Takes a couple of goes of practice to get it right.
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Prasad.
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Hi,
I would like to cast a thin layer of PMMA PolyMethylMetAcrylate on a silicon mold. I bought a commercial PMMA in powder, and I found a recipe to dissolve it in toluene (2% w/w). Does anybody know a different, but effective, recipe?
Thanks a lot!
bye!
lag
Hi,
I have a big problem because I'd like to buy PMMA PolyMethylMetAcrylate in powder to produce transparent acrylic awards and trophies but I can't find ecxcatly where I can buy it. I found out that I need toluene and that's all. I have been looknig for this raw material fo 2 weeks and I'll be very, very appreciate for your help. Nobody could help me.
I need a help, please!
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I'm sure you've tried this already, but I typed "PMMA POWDER" into google and there LOADS of links to componies that sell it worldwide. Have you tried to contact any of them?