Dma q800

Using TA Instruments
DSC Q200, the thermal properties of the samples were studied. Two
tests per sample were performed to create a standard deviation. Approximately,
5 mg was cut from each sample and was encapsulated in aluminum. With
a 50 mL/min^–1 nitrogen flow rate, the samples were
ramped at 5.00 °C/min using a heat/cool/heat method. The crystallinity
of the samples was calculated using the following formula where ΔH_m is the measured melting enthalpy, ΔH_cc is the measured enthalpy of cold crystallization, and
ΔH_m⁰ is the theoretical melting enthalpy of 100%
crystalline PLA, taken
from the literature to be 93.7 J/g⁴.
Dynamic thermal
analysis (DMA) was performed with the use of a DMA Q800 (TA Instruments,
New Castle, DE). All measurements were carried out at a constant frequency
of 1 Hz and strain amplitude of 0.01%. The temperature range was 30–150
°C, whereas the heating rate was 3 °C/min. The viscoelastic
properties were collected from rectangular samples (3.2 × 12.7
× 50 mm) using the dual cantilever measurement mode.
The
heat deflection temperature (HDT) of the samples was acquired
using TA Instruments DMA Q800 following ASTM D648. The desired stress
of 0.455 MPa was applied to the midsection of the sample, and a heating
rate of 2 °C/min was utilized. The strain rate was measured at
250 μm (0.2% strain), and two tests were performed on each type
of sample.

Tensile testing of PEDOT:Nafion
fibers was performed using a DMA Q800 (TA Instruments) with a ramped
force of 0.5 N min^–1. The dynamic characterization
was performed by subjecting a fiber to 100 cycles of 6 s displacement
to 10% strain followed by 30 s release. The electrical resistance
was measured in situ using a Keysight U1253B multimeter collecting
1 data point s^–1. Samples of the Nafion/ABS blends
for tensile testing were prepared in a hot press (AB Nike Hydralik)
at 240 °C in two steps, 5 ton for 2 min and 10 tons for 3 min,
with 0.1 mm spacers. The resulting films were cut into strips with
a width of 4 mm and a thickness varying from 0.07 to 0.13 mm. The
Young’s modulus of Nafion/ABS blends was determined from tensile
tests at a force rate of 1 N min^–1 using a DMA Q800
(TA Instruments). To test the adhesion between Nafion/ABS blends,
ABS and HIPS, rectangular test strips (30 mm × 5 mm × 0.2
mm) were 3D printed onto printed substrates (thickness 0.2 mm). At
one end, the strips were separated from the substrate by a thin paper.
The loose ends of the strips and the substrate were mounted into a
DMA TA Q800, and peeling tests were performed with a constant displacement
rate of 1 mm min^–1.