500
L. V. Karabanova et al.
Fig. 10 The relation of
storage modulus of
nanocomposite to storage
modulus of native PU
(M n /M o ) versus POSS
content in the range
of temperature from −80 to
−50 °C
the polymer chain. But with an increase of POSS amount up to 10% a certain part
of the POSS is not implanted, but plays a role of the nanofiller in the system.
3.6 Morphology of the POSS-Containing Nanocomposites
Figure 11 shows the SEM images of PU and PU/POSS nanocomposites with different
POSS content. It was found that homogeneous at this level structure of PU samples
becomes more segregated with increasing of POSS content. We observed POSS
particles aggregation in the form of rectangular microdomains for nanocomposite
with the maximum POSS content. Obviously, the POSS introduced in PU matrix
acts as a nanostructuring agent. As a result, the nanocomposites with more ordered
structure are formed thus leading to materials with improved thermal stability.
4 Conclusions
Nanocomposites based on PU matrix and 1,2-propanediolisobutyl-POSS (POSS)
nanoparticles were prepared and investigated. POSS nanoparticles were incorporated
into PU matrix in the process of PU synthesis. The structure peculiarities, the dynamic
mechanical and thermal properties, the morphology of the nanocomposites have
been investigated. Overall, it was found that POSS nanoparticles are capable to be
incorporated into PU polymer chain by a chemical reaction between hydroxyl groups
of POSS and isocyanate groups of PU. The incorporation of the POSS nanoparticles
into PU matrix leads to the formation of more ordered structure, and the POSS acts
as a nanostructuring agent in the system.
The introduction of the POSS nanoparticles into PU matrix significantly affects
the thermal stability of the nanocomposites. The increase in thermal stability of the
nanocomposites with the amount of POSS in the systems has been detected.
The investigation by WAXS/SAXS methods has shown that nanofiller POSS
slightly affects the amorphous structure of PU. However, to a greater extent, the
L. V. Karabanova et al.
Fig. 10 The relation of
storage modulus of
nanocomposite to storage
modulus of native PU
(M n /M o ) versus POSS
content in the range
of temperature from −80 to
−50 °C
the polymer chain. But with an increase of POSS amount up to 10% a certain part
of the POSS is not implanted, but plays a role of the nanofiller in the system.
3.6 Morphology of the POSS-Containing Nanocomposites
Figure 11 shows the SEM images of PU and PU/POSS nanocomposites with different
POSS content. It was found that homogeneous at this level structure of PU samples
becomes more segregated with increasing of POSS content. We observed POSS
particles aggregation in the form of rectangular microdomains for nanocomposite
with the maximum POSS content. Obviously, the POSS introduced in PU matrix
acts as a nanostructuring agent. As a result, the nanocomposites with more ordered
structure are formed thus leading to materials with improved thermal stability.
4 Conclusions
Nanocomposites based on PU matrix and 1,2-propanediolisobutyl-POSS (POSS)
nanoparticles were prepared and investigated. POSS nanoparticles were incorporated
into PU matrix in the process of PU synthesis. The structure peculiarities, the dynamic
mechanical and thermal properties, the morphology of the nanocomposites have
been investigated. Overall, it was found that POSS nanoparticles are capable to be
incorporated into PU polymer chain by a chemical reaction between hydroxyl groups
of POSS and isocyanate groups of PU. The incorporation of the POSS nanoparticles
into PU matrix leads to the formation of more ordered structure, and the POSS acts
as a nanostructuring agent in the system.
The introduction of the POSS nanoparticles into PU matrix significantly affects
the thermal stability of the nanocomposites. The increase in thermal stability of the
nanocomposites with the amount of POSS in the systems has been detected.
The investigation by WAXS/SAXS methods has shown that nanofiller POSS
slightly affects the amorphous structure of PU. However, to a greater extent, the