Cover Image, Volume 51, Issue 6


original image

Poly(methyl methacrylate) can breathe when it is immersed in a mixture of a non-solvent (water) and good solvent (THF), as presented by Farnaz Farbod, Behzad Pourabbas, and Mehdi Sharif on page 441. In normal breath figure formation, a surface swollen layer is formed by solvent on the glassy polymer. When this is surrounded by a temperature and humidity controlled atmosphere, a combination of concurrent events including evaporation of the solvent and water vapor condensation on the cooled surface lead to formation of regular patterns, the breath figure. However, the surface of a glassy polymer can be decorated much easier by a process called direct breath figure formation, when the regularity of the pattern hasminor priority.