Testing and characterizing polylactic acid-hydroxyapatite composite filament for 3D Printing

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Abstract:

Current methods to treat bone lesions such as allograft and autograft present predominant disadvantages such as infection. Synthetic grafts have been hypothesized as a promising solution. For example, Fused Filament Fabrication provides the ability to produce complex structures such as bone. The suggestion of polylactic acid-hydroxyapatite (PLA-HA) composites were hypothesized to provide positive results. Characteristics of PLA make it a favorable material as it is biocompatible, non-toxic, and biodegradable. The addition of HA assists complications regarding bone osseointegration. In this work, the aim is to produce composite filament made of PLA matrix with 0, 5, 10, 20, and 30 percent HA by weight. Dehydrated HA and PLA powders were dispersed in ethanol and extruded into filament via single-screw extruder. As a control, two pure PLA filaments were used as a reference. The first controlled PLA filament was bought from PROTOPASTA. As for control filament two, pure PLA filament underwent the same production process as the PLA-HA composite filaments. Standard ASTM tests were used for characterization of filament. Tensile tests (ASTM D638-14) provided information regarding strength, elasticity, yield stress, strain, and elongation at break.  Regarding incinerating filament (ASTM D3171-15), density, fiber, matrix, and reinforced content can be determined.

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Elizabeth Noriega Landa
In your discussion you mention needing new printing parameters, so which one are you thinking of changing besides printing speed, and why?
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