ADDITIVE MANUFACTURING OF FLUOROELASTOMER LATEX: A DIRECT-INK-WRITING APPROACH
Fluoroelastomers (FKM) are beneficial materials with desirable properties such as resistance to chemical environments, aging, fluid, and high temperatures. However, FKM processing is restricted to the use of conventional tooling equipment to produce goods, in which energy-intensive procedures including mixing, shaping, and vulcanization are a part of manufacturing. These processes are carbon intensive because the primary energy source is fossil fuels. Our strategy is predicated on using additive manufacturing (AM) as a tool-less manufacturing process exhibiting customizability, flexibility, and sustainability. AM machines consume energy only while building objects in contrast to energy-intensive machinery. Thus, our plan of action is to combine AM with a newly developed FKM ink that can be 3D printed with a direct-ink-write (DIW) process. The rheological characteristics, printing parameters, and mechanical properties of the formulated ink are investigated. We believe that this adaptable method will make it easier to produce 3D-printed FKM components with DIW, which could have a wide range of applications in engineering and consumer goods.ABSTRACT

Process flow for FKM latex printing.

FKM latex printing: (a) DIW system, (b) shear thinning FKM ink for DIW, (c) ink exhibiting yield stress after extrusion from the nozzle.

Thermogravimetric analysis of terpolymer FKM latex before (black) and after (red) being centrifuged.

Graph showing the viscosity of the FKM inks as a function of shear rate.

Changes in the width of printed lines at (a) constant pressure with varying printing speeds and (b) constant speed with varying extrusion pressures. (c) Microscope image comparison of unfilled ink for constant pressure experiment. (d) Microscope image comparison of unfilled ink for constant speed experiment.

DSC curves of uncrosslinked FKM ink for filled and unfilled samples.

Dimensional accuracy of printed parts using FKM inks.

Examples of 3D-printed structures.
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