×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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

Stabilizing UHMWPE for the space environment

Stabilizing UHMWPE for the space environment

Stabilizing UHMWPE for the space environment

(OP)
Hello!

I'm working with a lab at the University of Notre Dame to try to make a better material for solar sails. They've created a polyethylene/graphene nanocomposite film (paper attached) that is roughly on par with kevlar in terms of unidirectional strength (whether biaxial drawing will work well remains to be seen). NASA seems interested and encouraged us to submit an SBIR proposal for it. I've come up with a testing plan for seeing how well the material will hold up to the space environment, but it's going to be expensive and slow. We might well only get one shot at getting it right.

The major question here is how to stabilize the 1 micron thick polymer film so it doesn't degrade too much after being hit with high energy protons, electrons and copious amounts of UV light (maybe even atomic oxygen) for years.

The normal goto surviving UV/weathering is carbon black or passivized titanium oxide. It works really well to block the UV without it penetrating much and can act as a mild antioxidant.

The catch there is that radiation is going to penetrate anyway, so it would probably be a good idea to try to prevent it from propagating damage but carbon black is known not to play too well with other anti-oxidation solutions.

If I may ask, does anyone know how this is usually handled? I would just try lots of different formulations, but testing for it iteration is going to cost $$$$ and take months.

Thanks,
Charlie West

RE: Stabilizing UHMWPE for the space environment

You might have a look at COC. One trade name is Topas
It's UV transparent, ok to gamma sterilization, and used as a barrier film layer
so film is available somewhere.


Politicians like to panic, they need activity. It is their substitute for achievement.

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

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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