SAMPE Journal - May/June 2022 - 66
FEATURE / GLASS FIBER REINFORCED THERMOPLASTIC COMPOSITES
matrix interfacial shear strength t was determined
using the following Equation (1).
(1)
Observation of Resin Distribution
A blended resin pellet was trimmed using a razor
blade, and a single fiber pull-out specimen was
trimmed at the resin in the area where the fiber
was embedded. It was then fixed to a sample stand
using epoxy adhesive (ARALDITERT30, Huntsman
Japan), and cross sections were prepared by cutting
with a microtome (EM UC6, LEICA). The single
fiber pull-out specimens were cut in the direction
perpendicular to the glass fiber axis. The specimens
were electronically stained by immersing them in
a 5 wt% phosphotungstic acid solution at 75°C for
3 hours and then in distilled water at 60°C for 10
minutes. After coating the samples with osmium,
they were observed using a field emission scanning
electron microscope (FESEM, SU8020, Hitachi
High-Technologies). Phosphotungstic acid reacts
Figure 2. SEM observation of a pulled-out fiber.
selectively with amide groups10
, so the higher the
concentration of amide groups in the polyamide
resin, the more it will be stained and the brighter
it will be observed by FESEM. PA6 has the largest
amide group concentration, followed by PA612,
PA1010, and PA12, so PA1010 will be brighter in
PA1010/PA12, PA612 in PA1010/PA612, and PA6 in
PA6/PA612.
(a) DSC curves of resin in the cooling process
(b) DSC curves of resin in the heating process
(c) DSC curves of blended resin in the cooling process (d) DSC curves of blended resin in the
heating process
Figure 3. DSC curves of resin.
66 | SAMPE JOURNAL | MAY/JUNE 2022
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SAMPE Journal - May/June 2022
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