In stability after photo degradation. FT-IR spectra showed high

In this paper, I
found that polybenzimidazole membranes that are acid doped have emerged as an
efficient and suitable electrolyte for ( large heat absorbing long chain
electrolyte membrane fuel storage device). The enhancement of  resistance ability of  polybenzimidazole films has been observed as
an important problem for commercial applications. So, they reported the
oxidative deterioration  of
polybenzimidazole films. The photo irradiation of  PBIE  under accelerated fluorescent degradation
conditions was carried out by longer wavelength  radiations (thickness > 300 nm) and
characterized by broad  angle X-ray
scattering and connection angle counting. The thermal characteristics of PBIE films
were analyzed by transmission examined calorimetry  and thermo gravimetric analysis which showed a
decrease in thermal stability after photo degradation.  FT-IR spectra showed high absorbance in the
carbonyl region in photo irradiated films while scanning electron microscope showed
nano structures / faults on the polymer membrane surface. Contact angle
measurements results revealed increase in hydrophilic behaviour and WAXD showed
enhancement in amorphous nature upon irradiation.

The scientists, on the basis
of photo degradation study of PBIE membranes, proposed that it may be concluded
that  polymer is devalue by an oxidative mode
of degradation. Major modifications were found in the carbonyl region of the larger
wavelength radiation which caused scattering. Heat spectroscopy and angle
measured process both have some relation and presents a decrease in contact
angle and an elevation in surface energy because of the formation of polar functional
groups on the surface of PBIE films. The thermal degradation research showed a decrease
in the deterioration   temperature which was  cause of the decrease of molecular weight due
to chain cutting in polymer. SEM  results
described  nano cracks, minor  fractures and holes. X-rays used to examine gradual
shift of broad diffraction peak maxima to the higher scattering angle which showed
randomness property of the degraded polymer. Based on these findings, a degradation
mechanism was proposed. Since, the results obtained by longer wavelength rays
of  sample were according to those
reported by thermal and chemical deterioration, it was concluded that photo  degradation may be used as an appropriate method
to study the accelerated reduction of polymers that are handy in fuel cells,
gas separations and other high performance applications. Those results showed
that UV  irradiation process may also be used
for surface modification of  polymer films.

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