000			01471nam a2200169Ia 4500
008			220216s9999 xx 000 0 und d
100			_aGaliani Danielle P
245		0	_aStudies on thermal-oxidative degradation behaviours of raw natural rubber: PRI and thermogravimetry analysis
260			_bPlastics,Rubber and Composites _c2013
300			_a334-339
520			_aThermal-oxidative degradation behaviours of raw natural rubber(NR) have been investigated by using thermogravimetry analysis in inert and oxidative atmospheres and the plasticity retention index(PRI). The activation energy Ea,was calculated using Horowitz-Metzger and Coats-Redfern methods and compared PRI. the Ea values obtained by each method were ingood agreement with each other.The june samples arre the least stable rubbers among the studied ones, whereas February samples exhibited the highest values of activation energy, therefore in agreement with the PRI behaviour, which indicates that the thermo-oxidative degradation reaction. Natural rubber is a product of biiological origin, and thus these variations in the values of thermal behaviour and PRI might be related to the genetic differences and alterations of climatic conditions that act directly on the synthesis of non-rubber constituents, which are generally reflected in latex and rubber properties.
650			_aDegradation
650			_aNatural rubber
650			_aPRI
650			_aThermogravimetry analysis
942			_cJS
999			_c69748 _d69748