Issue 5, 2021

PET-RAFT facilitated 3D printable resins with multifunctional RAFT agents

Abstract

The application of reversible addition–fragmentation chain-transfer (RAFT) agents in stereolithographic 3D printing has been seldom reported due to their tendency to reduce polymerization rates. In this work, multi-arm RAFT agents (1, 2, 3, 4 arms) were used in model photoresins that were 3D printed using a PET-RAFT polymerization system. These resins were efficiently 3D printed under ultra-low intensity green-light (λmax = 530 nm, 0.32 mW cm−2) with a commercial DLP 3D printer. Optimization of printing conditions indicated that the storage moduli and glass transition temperature of 3D printed parts were increased, then plateaued with increasing curing time. Notably, a relatively low ratio of monofunctional RAFT agent was found to concurrently enhance storage modulus and fracture toughness in comparison with unmodified systems. In addition, changing the concentration and functionality of RAFT agents provided control over material mechanical properties in a broad span. With comprehensive knowledge of these properties, these photoresins should allow the expansion of advanced materials for 3D printing.

Graphical abstract: PET-RAFT facilitated 3D printable resins with multifunctional RAFT agents

Supplementary files

Article information

Article type
Research Article
Submitted
23 nov 2020
Accepted
21 dec 2020
First published
22 dec 2020

Mater. Chem. Front., 2021,5, 2271-2282

PET-RAFT facilitated 3D printable resins with multifunctional RAFT agents

X. Shi, J. Zhang, N. Corrigan and C. Boyer, Mater. Chem. Front., 2021, 5, 2271 DOI: 10.1039/D0QM00961J

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