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Impacts of Mechanical Recycling on the Thermal and Mechanical Properties of ULTEM 1000


Title: Impacts of Mechanical Recycling on the Thermal and Mechanical Properties of ULTEM 1000

Authors: Nicholas Gajkowski, Luke Grant, Tyrone Woodard, Jakob Waltz, Sean Ryan, John Misasi

DOI: 10.33599/nasampe/c.23.0111

Abstract: Recycling materials at the end of their useful lives is becoming ever more necessary in the modern world due to the increasing demand for raw materials and the minimization of the impacts of climate change. Aerospace materials such as various ULTEM grades are high value and have high embodied energy, and therefore it is critical to ensure these materials are reused and not wasted. However, there is limited information available on how to recycle ULTEM 1000 and the impacts of recycling on its properties. In this research, ULTEM 1000 was taken through a mechanical recycling process five separate times and then characterized to better understand the impacts of recycling on processability and properties. Processability was studied via screw torque and die pressure during twin-screw extrusion for each recycling cycle. The chemical characteristics after recycling were characterized by FTIR to observe oxidative products from thermal cycling. Thermal analysis was performed via TGA and DSC to characterize mechanical recycling’s impacts on basic thermal degradation properties and the glass transition temperature, respectively. Viscosity as a function of shear rate at typical injection molding temperatures was measured via parallel plate rheology. Finally, injection molded mechanical specimens were tested in tension to examine the relationship between the number of times recycled and critical mechanical properties (modulus, ultimate strength, yield strain). The above test results show that ULTEM 1000 can be recycled many times before serious degradation of the physical, thermal, and mechanical properties.

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Conference: CAMX 2023

Publication Date: 2023/10/30

SKU: TP23-0000000111

Pages: 10

Price: $20.00

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