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Material-Process-Structure-Property Relationships for Direct-Ink-Writing of Polymer Composite-type Precursors
Dissertation

Material-Process-Structure-Property Relationships for Direct-Ink-Writing of Polymer Composite-type Precursors

Caitlin Ann Grover
Doctor of Philosophy (PhD), Washington State University
12/2025
DOI:
https://doi.org/10.7273/000008356
pdf
Caitlin Grover_DissertationComplete_v24.34 MB
Embargoed Access, Embargo ends: 02/26/2028
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ELASTI~11.43 MB
Video Extensional Rheology on an Elastic Fluid Embargoed Access, Embargo ends: 02/26/2028
MP4
YIELDI~1367.73 kB
Video Extensional Rheology on Yielding Fluid Embargoed Access, Embargo ends: 02/26/2028

Abstract

3D Printing Ceramic matrix composites Polymer composites Wall slip Rheology
Polymer composite-type precursors hold exceptional promise in the manufacturing of polymers, ceramics, metals, and their composites stemming from their simplicity, processibility, and tunable rheological properties. These precursors cover a large compositional space with markedly varying rheology; thus, these precursors can be used in a large variety of manufacturing methods, including direct-ink-writing (DIW). Several complexities lie within DIW, including the complex flow mechanisms governing structural evolution during the process, which are influenced by material composition and printing nozzle geometry. Our approach to understanding these mechanisms is generalizing composition-rheology relationships, which is foundational to precursor design, then implementing a multimodal rheological model to elucidate wall slip and shear flow contributions to ink flow. Additionally, understanding final part properties is paramount to creating a robust component, so material characterization efforts were made to study the compositional evolution through pyrolysis and sintering of these precursors and the effects on mechanical properties.

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