Payne effect and its associated weak overshoot are of importance for understanding and regulating the softening of rubber nanocomposites under large amplitude oscillations. Herein, Payne effect in diverse filled vulcanizates is investigated for generalizing the common characteristics. Master curves of strain amplitude dependent storage modulus are created with respect to microscopic strain amplitude of the matrix, revealing a matrix-dominated elastic nonlinearity being independent of type and dispersity of filler, crosslinking density and sol fraction of matrix and filler-rubber interfacial interactions. However, carbonaceous fillers with higher affinity to the rubber matrices yield lower strain amplification and higher overshoot behavior in comparison with siliceous silica. The investigation would be illuminating for preparing rubber nanocomposites with optimized reinforcement and softening performances.
As a smart soft material, electrorheological elastomers (EREs) present tunable damping capacity and adjustable dynamic moduli on applying an electric field. Most of the previous studies focused on their dynamic moduli, while the damping performance has been neglected. In this study, the damping capacity of two kinds of EREs containing bare TiO2 and silane coupling agent-modified TiO2 particles were tested and compared as a function of strain amplitude. The results indicate that the modified TiO2 particle filled EREs present lower damping capacity when the strain amplitude exceeds 10%, indicating that the interfacial friction between the modified TiO2 particles and the matrix is decreased due to the stronger interface strength. A theoretical model is developed to describe the damping behaviour of the EREs, which is divided into the intrinsic damping, the interface damping and the electric field induced damping. The experimental results are well matched with the damping curves given by this model under various electric field strengths, and the difference between the damping capacity of the ERE containing bare TiO2 particles and the one containing modified TiO2 particles can be mainly ascribed to the effect of weakly and strongly bonded interface damping.
危险品化学品经营许可证（带存储）