Curing Characteristics and Kinetics of Natural Rubber – Nano Calcium Carbonate Composites.
Journal Title: International Journal of Engineering and Science Invention - Year 2018, Vol 7, Issue 7
Abstract
The effect of nano sized precipitated calcium carbonate on the kinetics of the vulcanization of natural rubber (NR) with a vulcanizing agent (sulfur) accelerated by N-oxydiethyl benzthiazyl sulfenamide (BSM) has been studied. Nano sized precipitated calcium carbonate filler can be suitably incorporated in a rubber matrix such as in natural rubber to make several composites.The vulcanization kinetics was determined by oscillating disc rheometry (ODR) and the kinetic parameters were determined by the model equations. Many kinetic models have been developed to describe vulcanization behavior. Generally, these models fall into two categories according to their fundamental ideas, namely mechanistic kinetic models and the phenomenological or empirical kinetic models The kinetic analysis suggests that the two-parameter auto catalytic model is the more appropriate one to elucidate the kinetics of the vulcanizing reaction of the present system. The autocatalytic reaction, the maximum rate of conversion will be other than zero due to involvement of product of reaction in the ongoing reaction. It is proved that all the models are temperature-dependent and fits the experimental data only at certain temperatures. These parameters support the nature of the experimental ODR curves (degree of conversion–time plots). The of nano precipitated calcium carbonate leads to a change in vulcanization reaction and has an effect on the kinetic parameters E, ln K0, m and n, and consequently on the overall reactivity. In the present work, the effect of nano –Calcium carbonate addition to natural rubber on the cure characteristics.
Authors and Affiliations
Dr. Mausumi Saha
Keywords
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