Phthalate plasticizer

[kclim]

In a previous post, I mentioned that I was looking at the difference between two phenolic resin components - one OEM and one original.

What we found was the resins were essentially the same apart from an additive - phthalic anhydride vs tetrahydrophthalic anhydride.

These compounds were detected via pyrolysis MS, so presumably they were present as ethers functioning as plasticisers.

What differences in property might one expect ingoing from phthalic anhydride to THPA additive? Or do they perform exactly the same function, with subtitution being a function of practicality (cost, safety issues)?

Thanks

 

[Compositepro]

You can get a wide variety of compounds from pyrolysis. Phthalic anhydride is used to make resins as well as plasticizers and I don't think its presence in the pyrolysis products necessarily indicates there is any plasticizer in your phenolic. It is more likeley the phenolic resins are different.

Do you know that there is plasicizer present in on of the resins? Putting plasticizer into phenolic seems odd to me.

 

[Demon3]

Agree 100% with Compositepro. The substances you detected are monomers used to make polymers.

Chris DeArmitt

http://www.phantomplastics.com

Consulting to the plastics industry

 

[kclim]

Thanks for your comments. It does make more sense that the phthalates are incorporated into the polymer. Assuming this is the case, how would you expect the properties would vary, in going from a phthalic anhydride copolymer to a hydrogenated PA?