Thermal Analysis of Thermoplastic Materials Filled with Chopped Fiber for Large Area 3D Printing

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Date

2019

Authors

Billah, Kazi Md Masum
Lorenzana, Fernando A.R.
Martinez, Nikki L.
Chacon, Sarah
Wicker, Ryan B.
Espalin, David

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Publisher

University of Texas at Austin

Abstract

At room temperature, material extrusion, in the context of large area fabrication, requires thermally stable materials and, as a result, fillers are included to tailor the thermal behavior. This research investigated the thermophysical properties of neat ABS and short carbon fiber (CF) reinforced ABS. Thermogravimetric analysis, differential scanning calorimetry, and thermomechanical analysis were carried out to determine the thermophysical properties. The addition of CF (20 wt. %) to an ABS matrix caused the glass transition temperature to change slightly (110 °C to 105 °C). Also, the CF within the ABS matrix reduced the thermal stability by decreasing the degradation on set temperature by (323 °C to 253 °C). Thermal deformation analysis showed that large area pellet extruded AM machine produces highly anisotropic materials. Thermomechanical analysis results showed that the coefficient of thermal expansion (CTE) reduced 4 times in the perpendicular to the extruded direction. The dataset and knowledge from the thermal analysis can be useful to design optimized printing parameters for highly filled thermoplastics used in large area 3D printing machines.

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