SAMPE Journal - March/April 2023 - 39

made by mixing together 66 g of granulate and 134g of virgin pellets in a bag
for 5 minutes. For the 67% recycled content samples, a 200 g batch was made
by mixing together 134 g of granulate and 66 g of virgin pellets in a bag for 5
minutes.
Material Characterization
Tensile Testing
Tensile testing was performed in accordance with ASTM D638.21
ASTM D638
Type I dogbone were prepared via injection molding with thicknesses of 3
mm ± 0.1 mm. Tensile testing was conducted on a 313 Universal Frame (Test
Resources, Shakopee, MN) at a rate of 2mm/min with a 50 kN load cell and a
2.54 cm gauge length extensometer (Epsilon, Jackson, WY) was employed to
calculate the strain. A minimum of six trials were performed for each of the 0%,
37%, 67%, and 100% recycled content samples.
Thermogravimetric Analysis
Samples were prepared for thermogravimetric analysis (TGA) by cutting pieces
from the virgin pellets, granulate, and injection molded specimens. Prior to
testing, 100 µL platinum pans were cleaned using a butane torch and tared.
TGA was performed utilizing a TGA 5500 (TA Instruments, New Castle, DE)
heating in argon at a rate of 10°C/min to 600°C. A minimum of three trials were
performed for each sample type.
Nuclear Magnetic Resonance Spectroscopy
Neat PA66 and the 100% recycled PA66/30CF/10AltF
samples were dissolved in cresol/chloroform
solvent. The liquid phase was filtered with a syringe
and dried using air. The cresol was removed via
vacuum drying in an oven at 70°C for 12 hours. The
remaining nylon solids from the neat PA66 and
100% recycled samples were dissolved in cresol-d/
CDCl3 overnight and transferred to nuclear
magnetic resonance (NMR) tubes. NMR was
conducted using a Bruker AVANCE 5000 MHz NMR
(Bruker Billerica, MA) with a cryoprobe. For each
sample, 1H NMR with 90° pulse with 1000 scans
and 13C quantitative NMR for 6000 scans.
Fiber Length Analysis
The fibers were extracted from the CF-based
hybrid composite by burning off the PA66. Each
sample type was placed in the center of a vented
box furnace (Thermo Scientific, Waltham, MA)
heated to 450°C for 4 hours in an aluminum tray
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MARCH APRIL 2023
|
SAMPE JOURNAL | 39
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SAMPE Journal - March/April 2023

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