am9b19986_si_004.mp4 (9.55 MB)
3D Printing Latex: A Route to Complex Geometries of High Molecular Weight Polymers
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posted on 2020-02-20, 19:09 authored by Philip
J. Scott, Viswanath Meenakshisundaram, Maruti Hegde, Christopher R. Kasprzak, Christopher R. Winkler, Keyton D. Feller, Christopher B. Williams, Timothy E. LongVat
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%.
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weight polymerspart resolutionComplex GeometriesVP system designThermal post-processingweight polymer latexeselastomer compositioncontinuous-phase scaffoldstyrene-butadiene rubber latexadditive manufacturingsemi-interpenetrating polymer networkparadoxHigh Molecular Weight Polymers Vat photopolymerization3 D Printing Latexlatex particlescomputer-vision print parameter optimization
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