Mechanical Properties of Polyisoprene-Based Elastomer Composites

Dhara, Deboleena; Rahman, Md Anisur; Ruzicka, Eric; Karekar, Akshay; Vlassopoulos, Dimitris; Saalwächter, Kay; Benicewicz, Brian; Kumar, Sanat K.

doi:10.1021/acs.macromol.3c01084

Title: Mechanical Properties of Polyisoprene-Based Elastomer Composites

Journal Article · 13 February 2024 · Macromolecules

DOI: https://doi.org/10.1021/acs.macromol.3c01084 · OSTI ID:2333792

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Columbia Univ., New York, NY (United States)
Univ. of South Carolina, Columbia, SC (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Univ. of South Carolina, Columbia, SC (United States)
Martin-Luther-Universitat, Halle-Wittenberg (Germany). Institute of Physics
FORTH, Institute for Electronic Structure and Laser, Heraklion (Greece); University of Crete, Heraklion (Greece)

Herein we have explored the origins of mechanical reinforcement in elastomers filled with polymer-grafted nanoparticles (NPs). The brush chains are constructed from the same monomers as the polymer melt, although they have different microstructures (i.e., different amounts of trans and cis isomers). The NPs display a variety of morphologies depending on variations in the graft density of the polymers, with these morphologies hardly changing when the matrix (and the grafts) is cross-linked using dicumyl peroxide (DCP). NMR measurements show that the cross-link densities depend only on the DCP content and are independent of NP morphologies. We find that the elastic moduli of these materials are strongly dependent on the NP morphology but that the maximum reinforcement occurs when the NPs percolate, in a manner where the cores are exposed enough to have strong enthalpic interactions; these interactions could either be due to direct core–core van der Waals attractions or due to bridging interactions driven by polymers adsorbed on adjacent NPs. The nonlinear mechanical response of these materials is less sensitive to changes in NP morphology and loading. These results emphasize the important role of the exposed NP surface in determining the moduli of cross-linked elastomers. This last aspect is apparently less relevant for the corresponding uncross-linked melts filled with NPs.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2333792

Journal Information:: Macromolecules, Journal Name: Macromolecules Journal Issue: 4 Vol. 57; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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