“…Until now, the research on microcellular foams has been mainly directed at polystyrene, 10 -18 polypropylene, 19 poly(methyl methacrylate), 20 polyamide, 21 polysulfone, 9,22,23 poly(ether sulfone), 23,24 poly(ether imide), 24 or their blends. [25][26][27][28][29][30][31] Only a few studies have been conducted on the preparation of microcellular polycarbonate (PC) foam, 5,32,33 one of the most important engineering plastics. Because of weak melt strength and melt elasticity, its foaming is more difficult than other plastics.…”