Smart Nanofiber Based on Nylon 6,6/Polyethylene Glycol Blend - Modern Trends in Chemistry and Chemical Engineering - page 103

Table 6.2. Phase change points and latent heat of Nylon 6,6/PEG nanofibers.
Blend Ratio Crystallization
Point (°C)

Latent Heat of
Crystallization (J/g)

Melting Point (°C) Latent Heat of Melting
(J/g)

100/50 44.76 34.78 57.06 53.03

100/130 47.50 85.95 59.76 85.42

CONCLUSION
Nylon 6,6/PEG6000 composite nanofibers have been prepared via electrospinning at
the blend ratio of 100/50-100/150. With increasing the total content of PEG in the
spinning solution at the constant applied voltage of 15 kV, the average fiber diameter
increases too. Increase in the shear viscosity of the blend solutions explains increase
in nanofiber diameter with PEG content. With increasing the PEG content up to the
blend ratio of 100/130, nanofibers were obtained on the collector. At the blend ratio of
100/150, no defect free fibers could be obtained which was due to the high viscosity
of the spinning solution at this blend ratio. In order to investigate the effect of applied
voltage on the morphology of the nanofibers, the samples were electrospun at 10 and
20 kV. Increasing the applied voltage led to increase in the average fiber diameter. It
can be explained by the fact that increasing the applied voltage draws more solution
out of the capillary. Thermal properties of electrospun nanofibers examined with DSC.
Pure nylon 6,6 nanofibers showed no heat capacity but the composite nylon 6,6/PEG
nanofibers offered the ability of heat storage. It is clear that increasing the PEG con-
tent in the blend nanofibers has a little effect on the phase change temperatures, but
strongly affects the latent heat of phase changes.

KEYWORDS

• Electrospinning

• Elongational flow

• Phase change materials

• Polyethylene glycol