Formation of anisotropic properties in elastomeric nanocomposites

Mokhireva, Kseniia A.; Свистков, А. Л.; Shadrin, V. V.

doi:10.1016/j.prostr.2021.09.020

Cited by 2 publications

(2 citation statements)

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“…In polymer processing it is widely known that at sufficiently low viscosities at elevated temperatures, shear forces and pressure orient the polymer chains in the material. In the same manner, 2D particles also tend to orient under these conditions when producing polymer nanocomposites 25–30 . Consequently, the orientation of 2D nanoparticles affects the mechanical properties of the nanocomposites, as reported in the literature.…”

Section: Introductionmentioning

confidence: 53%

“…In the same manner, 2D particles also tend to orient under these conditions when producing polymer nanocomposites. [25][26][27][28][29][30] Consequently, the orientation of 2D nanoparticles affects the mechanical properties of the nanocomposites, as reported in the literature. Li et al determined the spatial orientation of graphene by Raman spectroscopy and calculated the resulting effect on the mechanical properties: compared to randomly oriented nanocomposites, fully aligned graphene yields a Young's modulus increased by a factor of about two for poly(vinyl alcohol) with graphene oxide concentrations of 1-5 wt %.…”

Section: Introductionmentioning

confidence: 82%

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The quantification of anisotropy in graphene/natural rubber nanocomposites: Evaluation of the aspect ratio, concentration, and crosslinking

Strommer

Schulze

Schartel

et al. 2023

J of Applied Polymer Sci

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In the processing of nanocomposites, high shear stresses at elevated temperatures orient two‐dimensional nanoparticles like graphene. This orientation leads to anisotropic mechanical, thermal or barrier properties of the nanocomposite. This anisotropy is addressed in this study by comparing graphene (few‐layer graphene, FLG) with a nanoscaled carbon black (nCB) at a filler content of 3 phr, by varying the vulcanization, and by comparing different FLG contents. Transmission electron microscopy gives insight into the qualitative orientation in the nanocomposite with FLG or nCB. The storage moduli parallel and normal to the orientation reveal the direction dependency of reinforcement through dynamic mechanical analysis (DMA). Dimensional swelling measurements show a restriction of the expansion parallel to the FLG orientation, and an increased expansion normal to the orientation. The vulcanization system and crosslinking determine the respective level of property values, and higher crosslinking densities increase the anisotropy in DMA resulting in values of up to 2.9 for the quantified anisotropy factor. With increasing FLG content, the anisotropy increases. A comparison of the results reveals swelling measurements as the most suitable method for the determination of anisotropy. Compared to recent literature, the presented processing induces higher anisotropy, leading to higher reinforcing effects in the direction of orientation.

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Section: Introductionmentioning

confidence: 53%