Hi everyone,
I'd like to know what are the various methods to improve the thermal resistance of polymer matrix composites, especially the epoxy-based ones. Normally, conventional PMCs creep or distort when heated to moderate temperature (>100-200°C), that can eventually lead to buckling and failure.
Any hints would be greatly appreciated
Thank you.
Best Wishes.
Post-crosslinking may help to a limited extent: by maintaining the matrix at a temperature higher than that of normal use, additional crosslinking occurs, making the polymer tougher, and with a higher Tg. But it'll also become more brittle. Unfortunately, except choosing a different, more heat-resistant polymer, there is not much to do.
Alain
Epoxy is one of the common thermosets. It needs a hardener to crosslink. Just like a net, warp and weft decide the fabric properties. By choosing suitable type of epoxy and hardener, the epoxy matrix can be tailored based on the desired properties.
Please focus on crosslink density and polymer chain between two crosslinks, so thermal resistance (which relates to heat transfer, storage, release) can be enhanced.
Du Lan
As Dr. Alain Celzard mentioned, for a given thermosetting matrix PMC system you can postcure it at its glass transition temperature or slightly above it. Bear in mind that the residual cross-linking will not enhance the thermal properties of the composite in a great extent and it may trigger its thermal degradation.
On the other hand, if what you want is to choose an epoxy-based PMC having high thermal properties, I would advice you to use epoxy with tetra-functional epoxy-based systems like tetraglycidyl-4,4′-diaminodiphenyl methane (TGDDM) or phenol formaldehyde-based (PF) systems.
Use of specific crosslinkers can improve the thermal properties of your polymer matrix
Thanks guys. Do you have any idea to what temperatures can the enhanced carbon./epoxy composite resist?
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