Abstract
AbstractThe density and tensile property changes in polypropylene resulting from various post‐crystallization aging procedures are investigated with the aim of (1) establishing standard procedures for the evaluation of these properties and (2) determining which conditioning treatment will provide optimum tensile properties. The morphology and resultant tensile behavior of polypropylene are particularly sensitive to conditioning treatments in the temperature range 145‐160°C. A procedure for compression molding plaques, carrying out isothermal annealing treatment in the 100‐170°C range and gradual cooling is described. The dependence on annealing temperature of the density, elongation, tensile modulus and yield stress is given.
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