ABSTRACT
Plastics play a major role in our everyday lives, ranging from basic commodity goods to more sophisticated cellular structures for drug delivery systems [1,2]. Cellular structures, or foams, were originally generated by mechanical, chemical, or physical means. However, steps taken to improve process economics, a ban on ozone depleting agents (CFCs, HCFCs), and product limitations associated with the use of organic solvents as blowing agents have resulted in the use of CO
and N
gases to create morphologies with diverse and intricate applications.
