From second link:
At low temperatures (just over room temperature), another type of polymer can be formed into elastic gels that are still stronger than most polymers, but still maintains its flexibility because of solvent that is trapped within the network, stretching like a rubber band.
Hmm. I wonder what the solvent is, and would it be harmful as it slowly evaporates?
Titan is, naturally, the stronger one. According to IBM, it has bone-like strength (its measurements were similar to the organic material that frames our bodies) and roughly one-third of the tensile strength of steel. When IBM researchers combined Titan with 2% to 5% carbon nanotubes, however, they found they could make a material three times stronger than the polyamides sometimes used on current aircraft.
OK, that seems potentially impressive.