Influence of Postprinting Conditions on Morphologies in a Three-Dimensional Printable Dual-Cure Interpenetrating Dimethacrylate/Epoxy Polymer Network

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

A dual-curing dimethacrylate/epoxy resin system was found to retain printed resolution after photocuring by digital light processing three-dimensional (3D) printing, and after a subsequent heating step, it had a glass transition temperature of up to 140 °C. Postprinting curing conditions were shown to influence the morphology of the fully cured structure, depending on the rate of epoxy polymerization by dynamic mechanical analysis (DMA). Curing of the epoxy component by heating to 180 °C immediately after UV exposure created a partially miscible, phase-separated structure, while delayed curing (dark curing at ambient temperature for long times, up to 5 weeks) resulted in a single, broad tan δpeak in DMA, indicating a miscible network system with no macroscale phase separation. This dispersion of the epoxy-amine monomers into the photopolymerized dimethacrylate polymer over long times is surprising and is attributed to lower critical solution temperature behavior of these two polymer systems. The resulting phase structure of the sequential interpenetrating polymer network was found to influence the thermal and mechanical properties of the finished 3D-printed article.

Original languageEnglish
Pages (from-to)9076–9084
Number of pages9
JournalACS Applied Polymer Materials
Volume4
Issue number12
Early online date23 Nov 2022
DOIs
Publication statusPublished - 9 Dec 2022

Keywords

  • additive manufacturing
  • dark cure
  • dimethacrylate
  • dynamic mechanical analysis
  • epoxy
  • photo-polymerization

Fingerprint

Dive into the research topics of 'Influence of Postprinting Conditions on Morphologies in a Three-Dimensional Printable Dual-Cure Interpenetrating Dimethacrylate/Epoxy Polymer Network'. Together they form a unique fingerprint.

Cite this