Proud Mom - Soap bubbles are probably a little off our 'expertise' and experience, but it is a fun topic. As a grandfather, I'm also looking for the perfect bubble solution, and the conventional recipes of liquid soap detergent, glycerin, corn syrup and water seems to be most often cited. I'm interested in your results with Elmer's glue. But, back to your question. You have researched the 'what makes a bubble' so you have an understanding of surface tension, the addition of soap and other ingredients that become surfactants and allow the liquid to become a partially stable film. Fundamentally, the bubble breaks for two reasons. One, it contacts another surface. It breaks. The second reason is the one you are experimenting for. Evaporation.
As you can appreciate, the thickness of this soap bubble film is is very slight, in the order of a few microns (one millionth of a meter) down to several hundred nanometers (one billionth of a meter). The bubble material is a sandwich made up of soap molecules on the inner and outer surface, sandwiching water molecules in between. The bubble breaks primarily because of evaporation of the water. This film is somewhat porous, and water molecules are able to evaporate into the atmosphere causing a break in the film, and an escape of the air inside the bubble. The air inside the bubble, just before it breaks is at a slightly higher pressure than the atmosphere that surrounds it. When that pressure exceeds the films ability to maintain its structural integrity, the bubble breaks. This is the same as would happen if you overinflated a rubber or latex based balloon and exceeded it's structural strength.
I've attached a link to a website that might help as well. You can search for other references under "soap bubble thickness", "soap bubble colors" etc. Publish your best recipe findings. As a control, I would not make the bubbles too large, as that would be detrimental to your tests. Size is a variable that should be controlled unless you want to extend the experiment and use a constant solution and determine how size affects your result.
Rick Marzhttp://www.ehow.com/facts_4966287_what- ... s-pop.html