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Ageing and degradation behaviour of short isora fibre reinforced NR composites
von Dr. Lovely Mathew, Dr. Rani Joseph
The use of polymeric materials under the influence of degrading agents such as ozonised air, gamma radiations, and heat has increased rapidly in recent years. Hence it is important to study the effects of such degrading agents on the performance of the composites.
The degradation behaviour on the mechanical properties of short isora fibre reinforced natural rubber composites have been studied by exposure to gamma radiations, ozone and heat and biodegradation. The effects of fibre treatment, fibre loading, fibre orientation and the role of bonding agent on the degradation pattern have been investigated. The use of chemically treated fibres to reinforce matrix has a profound influence on the properties of the composites.
At higher fibre loadings, the longitudinally oriented composites showed better resistance to radiation, ozone and thermal ageing. The intensity of crack developed as a result of ozone attack decreased with the increase in fibre loading. The alkali treated fibre composite with bonding agent effectively prevents the propagation of the crack developed by ozone attack.
The extent of degradation was found to influence on the dosage of gamma radiation. The tensile properties were found to decrease with the increase in the time of exposure to gamma radiation. The reduction in properties is due to the chain scission and degradation, occurring in rubber molecules as a result of the oxidation promoted by the high energy radiation.
The effect of biodegradation on the mechanical properties of short isora fibre reinforced natural rubber composites has been studied by soil burial conditions. Chemical modifications of fibres have resulted in enhanced tensile properties and durability characteristics.