Conclusions
OMt are nowadays used in elastomeric materials, also for demanding
dynamic-mechanical applications. In particular, large scale diffusion
of OMt is achieved by using them in partial substitution of a traditional
filler, such as CB. Thiswork studied the correlation between the OMt organization
and the dynamic-mechanical properties of polymer nanocomposites
based on PI as the polymer matrix and CB as the main
filler. Nanocomposites were prepared with two types of OMt: I-OMt,
with ammonium cation intercalated between the clay mineral layers
and D-OMt, obtained via ball milling of I-OMt. It is shown that OMt
and CB formhybrid filler network and that I-OMt promote the filler networking
phenomenonmore easily than D-OMt. This is confirmed by a
stronger reduction of the storage modulus with the strain amplitude and by the expansion of the rubbery plateaus at low frequencies. The
higher ability of I-OMt to form hybrid networks with CB was observed
also in nanocomposites crosslinked with sulfur based systems. Results
arising from the analyzed composition suggest that the partial replacement
of CB with D-OMt gives a lower non linearity of the dynamicmechanical
properties of a crosslinked elastomeric compound having
formulations close to the ones used for large scale applications.
The control of OMt organization and namely the extent of OMt delamination
are presented as a key feature for reducing the dissipation
of energy in dynamic-mechanical applications of polymer melts and
elastomers containing a filler, such as CB, suitable to establish an intimate
interaction with the organoclay.
ConclusionsOMt are nowadays used in elastomeric materials, also for demandingdynamic-mechanical applications. In particular, large scale diffusionof OMt is achieved by using them in partial substitution of a traditionalfiller, such as CB. Thiswork studied the correlation between the OMt organizationand the dynamic-mechanical properties of polymer nanocompositesbased on PI as the polymer matrix and CB as the mainfiller. Nanocomposites were prepared with two types of OMt: I-OMt,with ammonium cation intercalated between the clay mineral layersand D-OMt, obtained via ball milling of I-OMt. It is shown that OMtand CB formhybrid filler network and that I-OMt promote the filler networkingphenomenonmore easily than D-OMt. This is confirmed by astronger reduction of the storage modulus with the strain amplitude and by the expansion of the rubbery plateaus at low frequencies. Thehigher ability of I-OMt to form hybrid networks with CB was observedalso in nanocomposites crosslinked with sulfur based systems. Resultsarising from the analyzed composition suggest that the partial replacementof CB with D-OMt gives a lower non linearity of the dynamicmechanicalproperties of a crosslinked elastomeric compound havingformulations close to the ones used for large scale applications.The control of OMt organization and namely the extent of OMt delaminationare presented as a key feature for reducing the dissipationof energy in dynamic-mechanical applications of polymer melts andelastomers containing a filler, such as CB, suitable to establish an intimateinteraction with the organoclay.
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