×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Phthalate plasticizer

Phthalate plasticizer

Phthalate plasticizer

(OP)
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

RE: Phthalate plasticizer

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.

RE: Phthalate plasticizer

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

Chris DeArmitt

www.phantomplastics.com
Consulting to the plastics industry

RE: Phthalate plasticizer

(OP)
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?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources