3D Printing Latex: A Route to Complex Geometries of High Molecular Weight Polymers

Philip J. Scott, Viswanath Meenakshisundaram, Maruti Hegde, Christopher R. Kasprzak, Christopher R. Winkler, Keyton D. Feller, Christopher B. Williams, Timothy E. Long

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Vat photopolymerization (VP) additive manufacturing fabricates intricate geometries with excellent resolution; however, high molecular weight polymers are not amenable to VP due to concomitant high solution and melt viscosities. Thus, a challenging paradox arises between printability and mechanical performance. This report describes concurrent photopolymer and VP system design to navigate this paradox with the unprecedented use of polymeric colloids (latexes) that effectively decouple the dependency of viscosity on molecular weight. Photocrosslinking of a continuous-phase scaffold, which surrounds the latex particles, combined with in situ computer-vision print parameter optimization, which compensates for light scattering, enables high-resolution VP of high molecular weight polymer latexes as particle-embedded green bodies. Thermal post-processing promotes coalescence of the dispersed particles throughout the scaffold, forming a semi-interpenetrating polymer network without loss in part resolution. Printing a styrene-butadiene rubber latex, a previously inaccessible elastomer composition for VP, exemplified this approach and yielded printed elastomers with precise geometry and tensile extensibilities exceeding 500%.

Original languageEnglish (US)
Pages (from-to)10918-10928
Number of pages11
JournalACS Applied Materials and Interfaces
Volume12
Issue number9
DOIs
StatePublished - Mar 4 2020
Externally publishedYes

Keywords

  • 3D printing
  • SBR
  • elastomers
  • latex
  • semi-interpenetrating polymer network
  • stereolithography
  • styrene-butadiene rubber
  • vat photopolymerization

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint Dive into the research topics of '3D Printing Latex: A Route to Complex Geometries of High Molecular Weight Polymers'. Together they form a unique fingerprint.

Cite this