Hallo, sounds to me that what is needed is the resin or binder that is used in injection moulding of metals.
I don't know the process in detail, but I believe that the metal powder is injection moulded on "normal" machines, e.g. Arburg, into a green state, using a binder which is similar to wax or low M.Wt. PE.
The soft parts are then placed in an oven and the binder is "evaporated", leaving the parts in a "brown" state. The metal powder is then fused to form the finished part by a process like sintering.
W There seems to be some interest in aligning carbon nanotubes in one direction. What if one mixed aggregate carbon nanotubes with molten PE or PE and then extruded. Then using the method after Damascus Steel, keep melting, stretching and folding over 10's , 100's , 1000's of times. The carbon nanotubes would be eventually aligned in one direction.
Now to remove the PE or PP matrix?? Possibly it could be vaporized off.