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Fakulteta za strojništvo, Ljubljana (FSLJ)
  • Understanding carbon-nanotube network formation in polymer-based nanocomposites [Elektronski vir]
    Oseli, Alen ; Mihelčič, Mohor ; Slemenik Perše, Lidija
    Anisotropic nature (rod-like geometry) allows carbon nanotubes (CNTs) to establish randomly connected web (network) in polymer matrices, which can be utilized as mechanical reinforcement or ... conducting pathway in numerous present and future-emerging technologies, from multifunctional structural elements to flexible electronic devices, sensors, etc. (Oseli et al., Macromolecules, 2021). However, functional performance of CNT-polymer nanocomposites mainly depends on the established network and its configuration (dispersed-high reinforcement, aggregatedhigh conductivity) driven by nanofiller geometry, content, as well as various mechanisms during nanocomposite productions (rupture, erosion, diffusion, etc.). Within this study, we report on the underlying physical principles of such network formation utilizing single-walled carbon nanotubes (SWCNT) in low- and high-density polyethylene matrices. Mechanisms were experimentally observed through plasma etching coupled with electron microscopy as well as rheological flow tests, where Doi-Edwards theory served as theoretical platform explaining particle behavior. Results showed, that established network is constructed from SWCNT bundles, which geometrically entangle at critical volume fraction Fv,crit (number of rods: ߘ30). Below Fv,crit, bundles behave as individual units, mainly interacting with host material. However, above Fv,crit, the rotation of bundles is constrained by neighboring units, leading to random network configuration. This "meso-scale superstructure" exhibits longrange particle interactions which result in profound rheological changes (increase 0,rel for ~700×). Moreover, the theory successfully explains SWCNT bundle behavior as Brownian entity and predicts networks formation through diminishing thermo- and hydro-dynamically driven diffusion, which can be manipulated during the production to enhance reinforcing/conductive functional performance of such materials.
    Vir: AERC 2022 – IBEREO 2022 [Elektronski vir] : 15th Annual European Rheology Conference [and] VIII Iberian Meeting on Rheology, Seville, Spain April 26-28, 2022 : book of abstracts (Str. 85)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2022
    Jezik - angleški
    COBISS.SI-ID - 108874499

    Povezava(-e):

    https://aercsevilla2022.es/static/upload/ow130/events/ev408/AERC2022_Book_of_Abstracts_VF5.pdf

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