  Using mixtures of soap, water, and long chain polymers, free-floating soap
bubbles can be formed with volumes approaching 100 m$^3$. Here we investigate
how such thin films are created and maintained over time. We show how the
extensional rheology is the most important factor in creating the bubble, and
how polydispersity in molecular weight of the solvated polymers leads to better
performance at lower concentrations. Additionally, using IR absorption, we
measure soap film thickness profiles and film lifetimes. Although the initial
thickness mostly depends on the choice of detergent, polymers can dramatically
increase film lifetime at high molecular weights and high concentrations,
although such high concentrations can inhibit the initial film formation. Thus,
the ideal concentration of polymer additives for making giant bubbles requires
a robust viscoelastic rheology during extension, and is aided by long film
lifetimes during gravitational drainage and evaporation.
