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Toughening and Imparting Deconstructability to 3D‐Printed Glassy Thermosets with “Transferinker” Additives

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Author(s)
Qin, K Peter
•
Herzog‐Arbeitman, Abraham
•
Zou, Weizhong
•
Chakraborty, Saswata
•
Kristufek, Samantha L
•
Husted, Keith EL
•
Joly, Guy D
•
Craig, Stephen L
•
Olsen, Bradley D
•
Johnson, Jeremiah A
Date Issued
September 11, 2024
Journal
Advanced Materials
Publisher
Wiley
Citation
Qin, K.P., Herzog-Arbeitman, A., Zou, W., Chakraborty, S., Kristufek, S.L., Husted, K.E.L., Joly, G.D., Craig, S.L., Olsen, B.D. and Johnson, J.A. (2025), Addition to: “Toughening and Imparting Deconstructability to 3D-Printed Glassy Thermosets with “Transferinker” Additives”. Adv. Mater., 37: 2511990.
Version
Final published version
Abstract
Thermoset toughness and deconstructability are often opposing features; simultaneously improving both without sacrificing other mechanical properties (e.g., stiffness and tensile strength) is difficult, but, if achieved, could enhance the usage lifetime and end‐of‐life options for these materials. Here, a strategy that addresses this challenge in the context of photopolymer resins commonly used for 3D printing of glassy, acrylic thermosets is introduced. It is shown that incorporating bis‐acrylate “transferinkers,” which are cross‐linkers capable of undergoing degenerative chain transfer and new strand growth, as additives (5–25 mol%) into homemade or commercially available photopolymer resins leads to photopolymer thermosets with substantially improved tensile toughness and triggered chemical deconstructability with minimal impacts on Young's moduli, tensile strengths, and glass transition temperatures. These properties result from a transferinker‐driven topological transition in network structure from the densely cross‐linked long, heterogeneous primary strands of traditional photopolymer networks to more uniform, star‐like networks with few dangling ends; the latter structure more effectively bear stress yet is also more easily depercolated via solvolysis. Thus, transferinkers represent a simple and effective strategy for improving the mechanical properties of photopolymer thermosets and providing a mechanism for their triggered deconstructability.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. Department of Chemical Engineering
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DOI of Published Version
https://doi.org/10.1002/adma.202406600
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