Abstract
Rheometers are the instruments which can determine the cure characteristics of the rubber compounds [1,2]. Generally, in these equipments, a certain shear strain is applied, and the torque response of the material is measured. Conventional rheometers include two-parallel-plate and cone-and-plate types which are utilized to study the rheological and the cure properties of the rubber compounds [1-7]. But in these instruments wall slip may occur and the sample loading in the gap is not easy, affecting the repeatability of the tests. In addition, the high viscosities of rubber compounds may raise a number of difficulties. For these reasons, it is necessary to develop specific measuring equipments. RPA (rubber process analyzer) is a strain-controlled shear cone-andcone rheometer specifically designed for raw elastomers and their compounds. It can be operated in rotation dynamic and relaxation modes. Rheological characterizations of gum and rubber compounds [8-10] and the cure behavior of compounds [11-13] can be investigated using RPA.
Highlights
Many researchers have reported the enhancement of the properties by incorporation of nano fillers into the polymers
Filled rubber compounds have an ability to dissipate a main part of the mechanical energy applied during deformation by damping which depends on the formed interactions between rubber and filler
As a response to increasing strain, rubber compounds show a non-linear viscoelastic behavior, which is detected as a drop in the elastic modulus versus strain [9]
Summary
Many researchers have reported the enhancement of the properties by incorporation of nano fillers into the polymers. Rubber processing analyzer (RPA) allows testing the strength of the filler networks and the filler-rubber interactions in the green compound as well as in the vulcanizate, in a wide range of shear amplitudes Using this instrument, the viscoelastic responses of the gum, master and final compound can be detected [7,8]. Tan δ (G′′/ G′) increases when the strain rises, recognizing that the energy of dynamic deformation is dissipated Fillers can affect this strain dependent trend in rubber compounds. Attempts have been made to the strain dependency and elasticity of different nano filled compounds In this way, SBR compounds having various amounts of clay (closite 10A) and black (N550) nano particles were prepared; and the effects of nano fillers type and content on the viscoelastic behavior were studied during the strain sweep tests. Copyright © All rights are reserved by Somayyeh Mohammadian Gezaz
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