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Your search keyword '"Onffroy, Philip R."' showing total 4 results
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4 results on '"Onffroy, Philip R."'

1. Opportunities at the Intersection of 3D Printed Polymers and Pyrolysis for the Microfabrication of Carbon-Based Energy Materials

Author

Onffroy, Philip R., Chiovoloni, Samuel, Kuo, Han Lin, Saccone, Max A., Lu, Jennifer Q., and DeSimone, Joseph M.

Abstract

In an era marked by a growing demand for sustainable and high-performance materials, the convergence of additive manufacturing (AM), also known as 3D printing, and the thermal treatment, or pyrolysis, of polymers to form high surface area hierarchically structured carbon materials stands poised to catalyze transformative advancements across a spectrum of electrification and energy storage applications. Designing 3D printed polymers using low-cost resins specifically for conversion to high performance carbon structures via post-printing thermal treatments overcomes the challenges of 3D printing pure carbon directly due to the inability of pure carbon to be polymerized, melted, or sintered under ambient conditions. In this perspective, we outline the current state of AM methods that have been used in combination with pyrolysis to generate 3D carbon structures and highlight promising systems to explore further. As part of this endeavor, we discuss the effects of 3D printed polymer chemistry composition, additives, and pyrolysis conditions on resulting 3D pyrolytic carbon properties. Furthermore, we demonstrate the viability of combining continuous liquid interface production (CLIP) vat photopolymerization with pyrolysis as a promising avenue for producing 3D pyrolytic carbon lattice structures with 15 μm feature resolution, paving way for 3D carbon-based sustainable energy applications.

Published
2024
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2. Residence Time Distribution and Specific Mechanical Energy in Solid-State Shear Pulverization: Processing-Structure-Property Relationships in a Chilled Extruder

Author

Onffroy, Philip R., Miu, Evan V., Confer, William J., Darkes-Burkey, Caleb M., Holler, William C., and Wakabayashi, Katsuyuki

Subjects
Extruding -- Methods, Polymerization -- Methods, Polymers -- Production processes -- Mechanical properties, Propylene, Polypropylene, Energy industries, Engineering and manufacturing industries, Science and technology
Abstract

Solid-state shear pulverization (SSSP) is a continuous polymer processing methodology based on a modified twin-screw extruder. The unique application of low barrel temperatures and mechanochemistry has contributed to the development of an extensive range of polymer-based materials, from environmentally responsible polymer blends to nanocomposites, for more than 30 years. The complex processing-structure-processing relationships in SSSP can be elucidated by way of integrated, measured covariants that capture the interplay between numerous processing parameters. Residence time distribution and specific mechanical energy are evaluated in a base case polypropylene (PP) study under a full factorial experiment involving screw design, screw speed, and throughput parameters. These factors are in turn correlated to dispersion morphology and thermal property results from a parallel study based on a model PP/carbon black composite. This investigation highlights the tunability of SSSP processing parameters for tailored output with desired purposes and applications. In particular, enhanced residence distribution can be achieved with low screw speed and high throughput settings, leading to high levels of material mixing and shear., INTRODUCTION Twin screw extrusion (TSE) is perhaps the most prevalent, cost-effective, and versatile continuous processing methodology in polymer engineering. In both academia and industry, significant research has been conducted on [...]

Published
2020
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