Effect of Nanoparticle Organization on Molecular Mobility
and Mechanical Properties of Polymer Nanocomposites
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Version 1 2019-08-13, 18:38Version 1 2019-08-13, 18:38
Posted on 2019-08-13 - 18:43
Influence of nanoparticle (NP) spatial
organization on relaxation
and mechanical properties of polymer nanocomposites (PNCs) was investigated.
For the first time, the properties of PNCs with various nanostructures
at the constant chemical composition were related to their experimentally
determined structural parameterseffective interfacial surface
and interparticle distance. Segmental scale reinforcement active below
and above glass transition was attributed to the immobilization and
frustration of polymer segments caused by attractive polymer–particle
interactions. A novel reinforcing mechanism of chain bound clusters
related to their internal structure was revealed while negligible
reinforcement from NP–NP interactions of contact aggregates
was found. The mechanical response of PNCs was correlated with appropriate
relaxation properties. It provided the first experimental proof that
deformation yielding dynamics of PNCs is controlled by glass transition
segmental mobility. Main features of various NP spatial organizations
were characterized. Chain bound clusters showed the most significant
reinforcement above the glass transition temperature (Tg). Moreover, the hierarchical nature of chain bound clusters
caused broadening of the ductile response compared to other nanostructures
and also to the neat matrix. The most pronounced enhancement of elastic
modulus, yield stress, and creep durability was found for individually
dispersed NPs. The acquired nanostructure–property relationships
will provide a foundation for the future design of hierarchic and
multidomain nanocomposites.
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Ondreas, Frantisek; Lepcio, Petr; Zboncak, Marek; Zarybnicka, Klara; Govaert, Leon E.; Jancar, Josef (2019). Effect of Nanoparticle Organization on Molecular Mobility
and Mechanical Properties of Polymer Nanocomposites. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.9b01197