Influence Of Ink Composition on Filament Geometry in Direct Ink Writing of Dense Pastes
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O'Kelly, Nora Phoebe
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Additive manufacturing via direct ink writing (DIW) has emerged as a versatile technique for creating structures using dense polymer composite structures. Understanding the relationship between the compositions of these highly solid-loaded (61.4 vol% solid) pastes and their filament geometry is crucial for consistently creating structures. This thesis employs a design of experiments approach to investigate how polyvinylpyrrolidone (PVP) molecular weight and concentration in methanol based binders influence single line filament dimensions and the difficulties associated with creating multi-layer structures. These factors were assessed for their impact on filament width, height, aspect ratio, and the angle made with the printing interface. These values were quantified from cross-sections of the printed structures and quantified from optical scans and image analysis via ImageJ. Increased concentration of PVP was found to decrease filament aspect ratio and increase the filament’s angle with the printing surface, while higher molecular weight exhibited the opposite effect due to a greater percentage of methanol in the paste. Issues related to slumping for dilute pastes were found to be affected by the printing surface. These findings will advance the understanding of binder formulation effects on DIW printability.
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Undergraduate Research Option Thesis