Mechanical and electrical properties of 3D-printed acrylonitrile butadiene styrene composites reinforced with carbon nanomaterials

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Show simple item record Weaver, Abigail 2017-04-18T16:30:07Z 2017-04-18T16:30:07Z 2017-05-01 en_US
dc.description.abstract 3D-printing is a popular manufacturing technique for making complex parts or small quantity batches. Currently, the applications of 3D-printing are limited by the material properties of the printed material. The processing parameters of commonly available 3D printing processes constrain the materials used to a small set of primarily plastic materials, which have relatively low strength and electrical conductivity. Adding filler materials has the potential to improve these properties and expand the applications of 3D printed material. Carbon nanomaterials show promise as filler materials due to their extremely high conductivity, strength, and surface area. In this work, Graphite, Carbon Nanotubes, and Carbon Black (CB) were mixed with raw Acrylonitrile Butadiene Styrene (ABS) pellets. The resulting mixture was extruded to form a composite filament. Tensile test specimens and electrical conductivity specimens were manufactured by Fused Deposition Method (FDM) 3D-printing using this composite filament as the feedstock material. Weight percentages of filler materials were varied from 0-20 wt% to see the effect of increasing filler loading on the composite materials. Additional tensile test specimens were fabricated and post-processed with heat and microwave irradiation in attempt to improve adhesion between layers of the 3D-printed materials. Electrical Impedance Spectroscopy tests on 15 wt% Multiwalled Carbon Nanotube (MWCNT) composite specimens showed an increase in DC electrical conductivity of over 6 orders of magnitude compared to neat ABS samples. This 15 wt% specimen had DC electrical conductivity of 8.74x10−6 S/cm, indicating semi-conducting behavior. MWCNT specimens with under 5 wt% filler loading and Graphite specimens with under 1 wt% filler loading showed strong insulating behavior similar to neat ABS. Tensile tests showed increases in tensile strength at 5 wt% CB and 0.5 wt% MWCNT. Placing the specimens in the oven at 135 °C for an hour caused increased the stiffness of the composite specimens.
dc.language.iso en_US en_US
dc.publisher Kansas State University en
dc.subject Fused Deposition Modeling en_US
dc.subject Carbon nanomaterials en_US
dc.subject Nanocomposites en_US
dc.subject Tensile properties en_US
dc.subject Acrylonitrile butadiene styrene composites en_US
dc.subject Additive manufacturing en_US
dc.title Mechanical and electrical properties of 3D-printed acrylonitrile butadiene styrene composites reinforced with carbon nanomaterials en_US
dc.type Thesis en_US Master of Science en_US
dc.description.level Masters en_US
dc.description.department Department of Mechanical and Nuclear Engineering en_US
dc.description.advisor Gurpreet Singh en_US 2017 en_US May en_US

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