Looking for low MW sodium polystyrene sulfonate (PSS)
Looking for low MW sodium polystyrene sulfonate (PSS)
(OP)
Folks, I am looking for low MW (<20 kD) sodium polystyrene sulfonate (PSS) for coating nanoparticles. The widely availble molecular weight is 70 kD, but with this molecular weight, dialysis cannot be used for purification. The ideal MW should be less than 20 kD. I know about the suppliers of GPC standards, but these standerds are too expensive ($300 per gram), besides, we do not need highly monodisperse polymer. Ideally, we would like to simply buy it and not synthesize it as we do not have characterization capabilites. I will appreciate any suggestions. Thanks.





RE: Looking for low MW sodium polystyrene sulfonate (PSS)
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You might call them and ask how low is low. They list medium and high as well so there's some hope.
A crude trick you might try is to take the 70 000 mwt, make a concentrated (viscous) solution of it in water and then beat it to death with a high speed mixer. This breaks down the molecular weight by chopping the large chains which are too slow to get out of the way of the blade. I have done this before. Not sure if 70 000 is high enough for this to work though. You can take a gel of high mwt PEO (PEG) in water and shop the long chains down in a couple on minutes. When done you no longer have a gel but an easy flowing solution.
There is not any memory with less satisfaction than the memory of some temptation we resisted.
- James Branch Cabell
RE: Looking for low MW sodium polystyrene sulfonate (PSS)
RE: Looking for low MW sodium polystyrene sulfonate (PSS)
There is not any memory with less satisfaction than the memory of some temptation we resisted.
- James Branch Cabell