Anna Makar-Limanov

Stanford

“Chemically Recyclable Resins for Additive Manufacturing”

Have you ever wondered how we develop new kinds of materials suitable for the 21st century? This work will discuss how we can leverage chemistry to make new, sustainable, chemically recyclable materials for resin 3D printing.

ABSTRACT

To address the plastic pollution problem, next-generation polymers must be designed with end-of-life in mind. This presents a synthetic challenge to incorporate degradability or recyclability without sacrificing material properties. In parallel with advances in additive manufacturing technologies, it is critical to co-design appropriate materials suited to the application while also considering their environmental impacts. In particular, the thermosetting polymers used in vat photopolymerization additive manufacturing, such as Continuous Liquid Interface Production (CLIP), cannot be traditionally recycled by melt reprocessing, furthering the need for engineering chemical reprocessing. This work discusses the design of star-shaped, CLIP-compatible methacrylate-functionalized resins synthesized by ring-opening polymerization. The goal of this project is to enable a closed-loop manufacturing system, where manufactured pieces can be degraded or depolymerized back to monomer, to allow for an infinitely recyclable material. Design principles, synthetic approaches, materials characterization, and future directions will be discussed.
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