In order for 3d printing to realize its potential for distributed manufacturing, it must be possible to make parts with acceptable mechanical properties, use local materials, and recycle or rework printed materials. Fused Filament Fabrication (FFF) printing of thermoplastics is generally limited by poor adhesion between layers in prints. Composite filaments for FFF are difficult to make and use due to the challenges in mixing highly viscous molten thermoplastics with filler and the inflexibility of the resulting filled filaments. Solution processing of thermoplastics facilitates homogeneous incorporation of filler, but introduces additional process steps, creates a solvent waste stream and potentially degrades composite performance through plasticization by residual solvent. Thermoreversible thermosets provides a solution to all of these problems. These highly cross-linked resins have thermal weak-links that break apart at higher temperatures and can reform to re-establish crosslinks once the temperature is reduced. The most common weak-link is the Diels-Alder cycloadduct of maleimides and furans that form at room temperature and exhibit a reversion temperature of 100°C. In our study, we have prepared and mechanically tested composites based on PLA, ABS, TPU, and bismaleimide-tetrafurfuryl thermoreversible thermosets with silica, silicate minerals, and tricalcium phosphate.

FFF 3D printing of filled thermoplastics and thermoreversible thermosets

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.