
34 Engineering of Polymers and Chemical Complexity
FIGURE 9 Effective heat of combustion versus time for PP and PP/MWCNT(3)
nanocomposites obtained by cone calorimeter at the incident heat flux of 35 kW m
–2
.
In the present study EPR research were performed to follow formation of stable
radicals, responsible for carbonization process, upon isothermal heating of PP/MC-
WNT (10 wt%) in air at 350°C.
Figure 10(a) shows EPR spectrum of the stable paramagnetic centers formed in
the samples of PP/MCWNT (10 wt%) heating in air at 350°C. When a heated in air
PP/MCWNT specimen was placed into an EPR sample tube, a narrow singlet signal
with a line width ...