The strain (γ) dependences of viscoelasticity and electrical resistance (R) of vapor grown carbon nanofiber (VGCF)/polystyrene (PS) composites have been studied using simultaneous measurement technique. The composites containing at least 4 vol.% VGCF present two regions of strain softening at γ < 10% and γ > 30%, respectively. Using strain amplification factor introduced by hydrodynamic effects as vertical and horizontal shifting factors, the curves of dynamic storage modulus (G′) and loss modulus (G″) as a function of γ for the composites can be superposed, respectively, on those for the pure matrix at γ ≥ 30%. Significant deflection from the master curves can be observed at γ < 30%. R tested as a function of γ provides direct evidences for breakdown of filler-filler interactions even by a small strain perturbation. It is suggested that breakdown of filler-filler interactions plays a vital role in strain softening at small strains, whereas the matrix provides the main contribution to strain softening at large strains. Dynamic moduli $$ G_{{{text{f,}}(0.1% ,varphi )}}^{prime } $$ and $$ G_{{{text{f,}}(0.1% ,varphi )}}^{prime prime } $$ of the filler phase at volume fraction φ at 0.1% strain are used to account for the viscoelastic contribution of the initial filler structure. Ratios of dynamic moduli of the filler phase to the composite at 0.1% strain, $$ G_{{{text{f,}}0.1% }}^{prime } /G_{{{text{c,}}0.1% }}^{prime } $$ and $$ G_{{{text{f,}}0.1% }}^{prime prime } /G_{{{text{c,}}0.1% }}^{prime prime } $$ , exhibit percolation-like transition as a function of φ, which is in consistence with the electric percolation transition.

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{{Explor lien
   |wiki=    Wicri/Lorraine
   |area=    LrgpV1
   |flux=    Hal
   |étape=   Curation
   |type=    RBID
   |clé=     Hal:hal-00604140
   |texte=   Non-linear viscoelasticity of vapor grown carbon nanofiber/polystyrene composites
}}