CHEMICAL AND THERMAL INVESTIGATIONS OF ELECTROSPUN POLYACRYLONITRILE NANOFIBERS INCORPORATED WITH VARIOUS NANOSCALE INCLUSIONS

Year 2017, , 1375 - 1390, 21.07.2017

Waseem Sabir Khan

https://doi.org/10.18186/journal-of-thermal-engineering.330180

Cited By: 28

Abstract

Thermal behaviors of electrospun polyacronitrile (PAN) fibers incorporated
with graphene nanoplatelets and multiwall carbon nanotubes (MWCNTs) were
evaluated using differential scanning calorimetry (DSC) and thermogravimetric
analysis (TGA) techniques. DSC was used to determine the glass transition
temperature (T_g), melting temperature (T_m) and heat flow of
the polymeric fibers, while TGA was used to determine the stages of thermal
breakdown, weight loss in each stage, thermal stability, and threshold
temperatures. Glass transition temperature is an especially important property during
the processing of polymers, applications, and storage. Pure PAN fiber has a T_g
of 104.09°C; however, in the presence of 2 and 4 wt.% of graphene in PAN
fibers, T_g values were increased to 105.07°C and 105.75°C, respectively, and
then decreased to 102.82°C at 8 wt. % of
graphene. Similarly, T_g values of PAN fibers were increased to
105.08°C and 108.19°C in the presence of 2
and 4 wt. % of MWCNTs, and then decreased to 104.98°C at 8 wt. % MWCNTs. The TGA curves
of pure PAN and PAN fibers with different weight percentages of graphene
nanoplatelets and MWCNTs exhibited a four-step weight loss.

In
FTIR spectra, the intensities between 2,400 and
2,200 cm^-1 for all samples of PAN having different weight
percentages of MWCNTs and graphene nanoplatelets corresponded to the C≡N band
for saturated nitrile groups.  

Keywords

Electrospun Nanocomposite Fibers, MWCNTs, Graphene, Thermal Analysis

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