×
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!

*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

Characterization of PC/ABS
4

Characterization of PC/ABS

Characterization of PC/ABS

(OP)
Dear All,

Would anyone know how to identify PC/ABS blend? I have tried to use FT-IR, but it only give me the PC spectrum. Any other methods to identify it? Furthermore, would anyone know how to obtain the ratio of PC and ABS in the PC/ABS blend? Which laboratories can do this in USA or Hong Kong?
Thanks a lot.

RE: Characterization of PC/ABS

4
You can distinguish PC/ABS by measuring the glass transition temperatures on a differential scanning calorimeter (DSC).  PC/ABS will have two glass transitions (Tg), one at 85-105 deg. C for the ABS and one at 155 deg. C
for the PC.  This method will not be very good for determining PC to ABS ratio.

Another method that will give a qualitative estimate of ABS content is to measure modulus vs. temp using dynamic mechanical analysis (DMA).  The modulus will drop at the glass transition temperatures of ABS and PC.  The plateau modulus of the material at temperatures above the Tg of ABS and below the Tg of PC will be an indicator of PC to ABS ratio.  You would need standards against which to compare.  GE has DMA curves for most of their PC/ABS products on their web site:

http://www.gepolymerland.com

You will need to register for this service.

There are numerous peaks in an FTIR spectrum of PC/ABS attributed to butadiene.  Unfortunately, I do not have any reference spectra available to tell you for what peaks to look.  Also, depending on the type of ABS, there can be IR peaks from the high heat additives such as alpha methyl styrene, para methyl styrene or n-phenyl maleimide.  If you are seeing only PC in the IR then possibly you only have PC.

There are numerous labs that can perform DSC and FTIR (or old fashioned diffraction IR), including:

Detroit Testing Laboratory (DSC & FTIR), Warren, Michigan

http://www.dtl-inc.com

Constellation Technology Corporation (DMA), Tampa, Florida

http://www.contech.com

RE: Characterization of PC/ABS

A quick and dirty test is to burn it and smell the smoke. The butadiene in the ABS gives a rubbery smell that is not in straight PC
It's best to have a known straight PC and a known PC/ABS alloy sample for comparison

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! Already a Member? Login


Resources

Solutions Brief - Protecting and Rescuing On-Ground Personnel
Keeping our warfighters safe and delivering them a competitive advantage is a key goal of departments of defense around the world. It’s a goal shared by embedded computing manufacturers like Abaco: we never forget who we serve.This case study describes how a major international contractor integrated an Abaco single board computer at the heart of its CAS/CSAR solution. Download Now
Datasheet - Top Enhancements Creo 7.0
PTC's Creo 7.0 has breakthrough innovations in the areas of generative design, real-time simulation, multibody design, additive manufacturing, and more! With Creo 7.0, you will be able to design the most innovative products faster than ever before, keeping you on the cutting edge of product design and ahead of your competition. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close