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distinguish polyester vs vinylester

distinguish polyester vs vinylester - Chemistry Forum

distinguish polyester vs vinylester - Chemistry Forum. Discuss chemical reactions, chemistry.


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  #1  
Old 02-18-2004, 01:41 PM
David A. Webb
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Default distinguish polyester vs vinylester



A customer dropped off a fiberglass rod, which is supposed to contain
either polyester or vinylester.

The glass content is very high, probably 95% at least.

Is there a method to determine if it is polyester or vinylester?

Thanks,

Dave




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  #2  
Old 02-18-2004, 06:22 PM
Frank Logullo
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Default distinguish polyester vs vinylester


"David A. Webb" <[Only registered users see links. ]> wrote in message
news:[Only registered users see links. ]...
I'm not sure how they cure vinylester but I see the base material is made by
addition of acrylic acid to bisphenol A.
Polyester is cured with styrene which can often be smelled on breaking a
piece of the plastic. Another possible sniff test would be to cook a piece
in caustic to hydrolyze then acidify with sulfuric acid to see if you can
smell acrylic acid.
I doubt if glass loading is 95% (except by weight) since that would make an
awfully dry composite.
Frank


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  #3  
Old 02-18-2004, 08:10 PM
Frank Logullo
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Default distinguish polyester vs vinylester


"Frank Logullo" <[Only registered users see links. ]> wrote in message
news:A3OYb.2005$[Only registered users see links. ].. .
by
piece
an
Should have said bisphenol A diglycidyl ether/ acrylic acid adduct:
[Only registered users see links. ]
Frank


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  #4  
Old 02-18-2004, 10:33 PM
Mark Tarka
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Default distinguish polyester vs vinylester

David A. Webb <[Only registered users see links. ]> wrote in message news:<[Only registered users see links. ]>. ..

Why?

And most cleaning products recommend testing
first on an inconspicuous area :-)


Mark (Alleged to not know nuttin)
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