I'm a Swedish mechanical engineering student currently writing my bachelor thesis.
One of the topics included regards aging of polymers. My knowledge of chemistry is still limited after weeks of intesive studies, and that's why I'm turning to you guys.
The problem is like this;
I am to suggest a cheap replacement for aluminium rating plates fastened on electrical equipment.
Seems easy enough, ya?
The thing is supposed to last for 30 years, in service temp of 55 °C (131 °F), with humidity 50-85%.
I cant use bolts or screws. It has to be an adhesive of some kind.
Cost restrictions forces me to use Thermal Transfer, meaning the rating plate has to be of polymeric material.
I've been in contact with numerous well-renowned suppliers and got about 20 different alternatives to choose from, that should work according to them. I just have to prove it somehow, and I still haven't found a critical parameter that allows me to say "this is great stuff".
Im currently comparing the following:
Recommended service temperature
Thermal expansions coefficient
Reference applications (i.e. if there is documented long-term use on laundry machines, motors, gearboxes etc).
I'm also performing a standard arrhenius-aging test, measuring loss of adhesion. I doubt it will give much info though, since I only have a few weeks and not the months or years required.
So, my questions...
- Should I remove some parameters?
- Is there a critical parameter that I have forgot to include?
Materials used are mainly HDPE, PE, PET, and some PVC (though this seems crappy). Adhesives are all PSA-type, mostly acrylic, but some rubber-based adhesives are included.
All help is greatly appreciated!