3D Printing of Viscoelastic Suspensions via Digital Light Synthesis for Tough Nanoparticle–Elastomer Composites

• DOI: 10.1002/adma.202001646
• Publication Date: 2020-05-18T06:18:55Z
• Authors: Kaiyang Wang; Wenyang Pan; Zheng Liu; Thomas J. Wallin; Geoffrey van Dover; Shuo Li; Emmanuel P. Giann...; Yigit Menguc; Robert F. Shepherd
• Keywords: Stereolithography

The rheological parameters required to print viscoelastic nanoparticle suspensions toward tough elastomers via Digital Light Synthesis (DLS) (an inverted projection stereolithography system) are reported. With a model material of functionalized silica nanoparticles suspended in poly(dimethylsiloxane) matrix, the rheological-parameters-guided DLS can structures seven times tougher than those formed from neat polymers. large yield stress and high viscosity associated with these concentration suspensions, however, may prevent pressure-driven flow, mechanism essential stereolithography-based printing. Thus, better predict evaluate printability boundary properties compatible is defined using non-dimensional Peclet number (Pe). Based on proposed analysis parameters, border at standard temperature pressure (STP) established by resin mass fraction (ϕsilica ) 0.15. Above this concentration, have Pe > 1 not printable. Beyond STP, be further extended ϕsilica = 0.20 heating module lower shear rate reduce < 1. printed rubber possesses even higher toughness (Γ ≈ 155 kJ m-3 ), which 40% over that