Estimation of Shelf Life of Unstabilized Polyolefins from Thermal Oxidation Data
PICATINNY ARSENAL DOVER NJ
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Utilizing carbonyl formation data previously obtained during the thermal oxidation of unstabilized atactic polypropylene, unstabilized isotactic polypropylene and unstabilized atactic polybutene-1 along with a semi-empirical expression, it was possible to extrapolate and obtain arbitrary induction times at relatively low temperatures. Values of induction times thus obtained were correlated with changes in physical properties, i.e., intrinsic viscosity and the product of ultimate elongation and ultimate tensile strength a product which is often referred to as the impact index.