M. Farzin et al./Chemical Papers
vii
PIL, NO3@PIL and N3@PIL which can be considered
as the melting point temperature of these polymers.
This assumption is confirmed by the lack of mass loss
at this temperature in TG analysis (Fig. 4). It is clear
from the results obtained by the DSC technique that
all the polymers are stable up to ∼270◦C. Hence, the
exothermic peak at 270◦C in the PIL shows the de-
struction of the imidazole groups embedded in the
polymer.
The thermal properties of the final polymers were
also studied (Fig. 4). The TGA analyses of all the
polymers showed two-step mass losses in the nitro-
gen atmosphere. The first step is related to the de-
composition of the imidazole groups in the tempera-
ture range of 250–300◦C. The second step (with higher
mass loss than in the first step) occurs in the range of
350–450◦C, which may be attributed to the polymeric
backbone decomposition of the prepared materials.
These TGA data with the DSC results reveal the
adequate thermal stability of the synthesised poly-
meric materials for applications in safe energetic ma-
terials and/or heterogeneous supports. Accordingly,
further studies are in progress to develop some novel
solid acids based on polymeric ionic liquids as hetero-
geneous catalysts.
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Conclusions
Novel polymeric ionic liquids (PILs) were pre-
pared by free radical co-polymerisation of 1-vinyl-3-(4-
nitrobenzyl)imidazolium bromide and 1-vinylimidazo-
le. The PIL thus prepared was then modified with
two different counter-ions to afford azido and nitro
analogues (N3@PIL and NO3@PIL) using the ion ex-
change technique. The final PIL materials were char-
acterised using the NMR, FTIR, DSC and TGA meth-
ods. The novel salt-based nitrogen-rich PILs were
found to possess adequate thermal stability, render-
ing them suitable candidates for new safe energetic
materials and/or heterogeneous supports.
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