Civil Engineering Reference
In-Depth Information
Figure 5.7
SEM-FEG micrographs of the pure BC and composites obtained through
in-situ
method
using APS or FeCl
3
, as oxidants. Reproduced from [62] with permission of Elsevier.
h e composites residues, the amount of PPy deposited on the BC nanoi bers and
the electrical conductivity increased with increasing monomer concentration. h e
composites showed lower onset degradation temperature than that of pure BC, due
to the loss of intermolecular hydrogen bonds of cellulose by the presence of conduct-
ing polymer. On the other hand, the PPy deposited on the nanoi ber surface started to
decompose at higher temperature when compared with pure PPy·APS and PPy·FeCl
3
samples, i.e., the onset degradation temperature of PPy·APS and PPy·FeCl
3
shit ed from
218
o
C to 265
o
C and 175
o
C to 230
o
C for BC/PPy·APS and BC/PPy·FeCl
3
composites,
respectively. h is behavior was attributed to the site-specii c interaction between PPy
and cellulose groups. As expected, the degradation temperature change was more pro-
nounced for the BC/PPy·FeCl
3
composites due to the higher site specii c interactions
between BC and PPy than those found for BC/PPy·APS composites. Furthermore, in
the PPy·FeCl
3
-coated system the electrical conductivity was higher than that found for
