Abstract
In this work, natural rubber (NR) based nanocomposites, using different amounts (0, 5, 10 and 15 parts per hundred rubber, phr) of nano-calcium carbonate (nano-CaCO3) with and without organoclay (OC) are prepared by melt mixing process. The prepared samples are characterized, performing X-ray diffraction (XRD) analysis, field emission scanning electron microscopy (FE-SEM), dynamic-mechanical thermal analysis (DMTA), swelling resistance in chemicals and tensile test. The tensile test results show that by the simultaneous using of 5phr OC and 10phr nano-CaCo3 the tensile strength is improved about 350%. The other tests such as XRD, FE-SEM, DMTA and swelling resistance tests as well as the theoretical investigation and calculating some thermodynamic parameters such as filler activity, activation enthalpy and Gibbs free energy reveal a considerable improvement of properties for the NR with OC and nano-CaCO3 in comparison to corresponding nanocomposites containing either one. The optimized sample in spite of having high elasticity exhibits high loss modulus which is very important in rubber product application.
Published Version
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