Advanced Materials for Additive Manufacturing: Architected Polymer Foams via Direct Bubble Writing
The polymer foam material refers to a microporous material based on a polymer (plastic, rubber, elastomer, or natural polymer material) with numerous bubbles inside, and can also be regarded as a composite material using gas as a filler. At present, polymer foam materials are mainly prepared by directly expanding and foaming the resin with a foaming agent. How to accurately control the micro-cell shape, the appearance and macro-foam structure are still a difficult problem. In order to solve some problems in the process of preparing polymer foam by direct expansion foaming method, Professor Jennifer A. Lewis and co-workers describe the fabrication of architected polymer foams by "direct bubble writing". In this process, bubbles are ejected into the air, deposited onto a substrate, and then photopolymerized with UV light, and open-and-closed-cell foams with locally graded densities can be printed into 3D objects such as 3D lattices, shells, and out-of-plane pillars. The resea
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