8 Nanocomposites Based on Thermosetting Polyurethane Matrix. . .
131
Fig. 8.6 Isotherms of
dichloromethane vapour
sorption at 20 ◦ C by samples:
1, polyurethane; 2,
nanocomposite with 0.1%
MWCNT-ox; 3,
nanocomposite with 0.25%
MWCNT-ox; 4, MWCNT-ox
and nanocomposites was studied using a vacuum installation and a McBain balance
with a sensitivity of 3–4 mg/mm.
Figure 8.6 shows the isotherms of dichloromethane vapour sorption at 20 ◦ C by
PU (curve 1), nanocomposites with 0.1% MWCNT-ox (curve 2), 0.25% MWCNTox (curve 3) and nanofiller MWCNT-ox (curve 4). As could be seen from Fig.
8.6, the isotherm of dichloromethane vapour sorption by PU looks like curve
typical for vapour sorption by elastomer sample. PU absorbs a significant amount
of dichloromethane (about 75% by weight). The introduction of MWCNT-ox into
PU leads to decreasing of dichloromethane vapour sorption (Fig. 8.6, curves 2,
3). Moreover, with an increase of amount of nanofiller in the nanocomposite, the
sorption of vapour by nanocomposites, naturally, falls (curves 2 and 3).
It should be noted that the nanofiller also adsorbs the essential amounts of
dichloromethane vapour (Fig. 8.6, curve 4). The reduction of dichloromethane
vapour sorption by nanocomposite samples compared to the native polymer matrix
may indicate the formation of densely packed boundary layers of polyurethane in
samples filled by MWCNT-ox.
Figure 8.7 shows the isotherms of dichloromethane vapour sorption at 20 ◦ C
by PU and by nanocomposites containing 0.1% MWCNT-red (curve 2) and 0.25%
MWCNT-red (curve 3) and by nanofiller MWCNT-red (curve 4). As could be
seen, the sorption by nanocomposite samples (Fig. 8.7, curves 2, 3) is smaller
in comparison with the PU matrix. But in this case, the sorption isotherms of
nanocomposites containing different amounts of MWCNT-red are almost identical.
On the qualitative level, the reduction of sorption by nanocomposites compared to
the native polymer matrix can testify in favour of the formation of densely packed
boundary layers of polyurethane in the filled samples containing MWCNT-red. But
131
Fig. 8.6 Isotherms of
dichloromethane vapour
sorption at 20 ◦ C by samples:
1, polyurethane; 2,
nanocomposite with 0.1%
MWCNT-ox; 3,
nanocomposite with 0.25%
MWCNT-ox; 4, MWCNT-ox
and nanocomposites was studied using a vacuum installation and a McBain balance
with a sensitivity of 3–4 mg/mm.
Figure 8.6 shows the isotherms of dichloromethane vapour sorption at 20 ◦ C by
PU (curve 1), nanocomposites with 0.1% MWCNT-ox (curve 2), 0.25% MWCNTox (curve 3) and nanofiller MWCNT-ox (curve 4). As could be seen from Fig.
8.6, the isotherm of dichloromethane vapour sorption by PU looks like curve
typical for vapour sorption by elastomer sample. PU absorbs a significant amount
of dichloromethane (about 75% by weight). The introduction of MWCNT-ox into
PU leads to decreasing of dichloromethane vapour sorption (Fig. 8.6, curves 2,
3). Moreover, with an increase of amount of nanofiller in the nanocomposite, the
sorption of vapour by nanocomposites, naturally, falls (curves 2 and 3).
It should be noted that the nanofiller also adsorbs the essential amounts of
dichloromethane vapour (Fig. 8.6, curve 4). The reduction of dichloromethane
vapour sorption by nanocomposite samples compared to the native polymer matrix
may indicate the formation of densely packed boundary layers of polyurethane in
samples filled by MWCNT-ox.
Figure 8.7 shows the isotherms of dichloromethane vapour sorption at 20 ◦ C
by PU and by nanocomposites containing 0.1% MWCNT-red (curve 2) and 0.25%
MWCNT-red (curve 3) and by nanofiller MWCNT-red (curve 4). As could be
seen, the sorption by nanocomposite samples (Fig. 8.7, curves 2, 3) is smaller
in comparison with the PU matrix. But in this case, the sorption isotherms of
nanocomposites containing different amounts of MWCNT-red are almost identical.
On the qualitative level, the reduction of sorption by nanocomposites compared to
the native polymer matrix can testify in favour of the formation of densely packed
boundary layers of polyurethane in the filled samples containing MWCNT-red. But