By Anonymous on Tuesday, September 16, 2003 - 11:13 am:
I have a sample of a weathered polypropylene sheet, it is a roofing product. The sheet has weathered prematurely, and it is suspected that a UV stabilizer was not added to the batch or maybe not added in sufficient quantity.
I believe there should be two stabilizer products in the blend, both of which are sterically hindered piperidnes.
Can anyone suggest a suitable solvent extraction to try to get at the stabilizer for analysis? I am thinking acetonitrile, or toluene, maybe a mixture?
I have tried taking IR spectrum and analyzing by pyro-GC, both with no luck. I do a lot of headspace analysis and some pyro, but not a lot of extractions. Any help would be appreciated.
Thanks in advance,
Mike
By Anonymous on Tuesday, September 16, 2003 - 12:09 pm:
Hot tolouene does a nice job of dissolving polyethylene. Perhaps, it will work for polypropylene.
By Anonymous on Wednesday, September 17, 2003 - 02:23 am:
we use 2-propanol and heat under reflux for antioxidant in PP
By Anonymous on Tuesday, September 23, 2003 - 04:13 pm:
I'd try Pyro-GC or Pyro-GC/MSD with a 400-55o oC in the pyrolisis.
By Anonymous on Wednesday, September 24, 2003 - 07:48 am:
A colleague of mine has done this type of thing using a cryogenic mill to micronize the sample followed by soxhlet extraction using methanol.
John